The Experts below are selected from a list of 75216 Experts worldwide ranked by ideXlab platform
Nobuhisa Suzuki - One of the best experts on this subject based on the ideXlab platform.
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Tensile Strain Capacity of X80 Pipeline Under Tensile Loading With Internal Pressure
2010 8th International Pipeline Conference Volume 4, 2010Co-Authors: Satoshi Igi, Takahiro Sakimoto, Ryuji Muraoka, Nobuhisa Suzuki, Takekazu ArakawaAbstract:This paper presents the results of experimental and finite element analysis (FEA) studies focused on the tensile Strain Capacity of X80 pipelines under large axial loading with high internal pressure. Full-pipe tensile test of girth welded joint was performed using high-Strain X80 linepipes. Curved wide plate (CWP) tests were also conducted to verify the Strain Capacity under a condition of no internal pressure. The influence of internal pressure was clearly observed in the Strain Capacity. Critical tensile Strain is reduced drastically due to the increased crack driving force under high internal pressure. In addition, SENT tests with shallow notch specimens were conducted in order to obtain a tearing resistance curve for the simulated HAZ of X80 material. Crack driving force curves were obtained by a series of FEA, and the critical global Strain of pressurized pipes was predicted to verify the Strain Capacity of X80 welded linepipes with surface defects. Predicted Strain showed good agreement with the experimental results.Copyright © 2010 by ASME
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Strain Capacity of X100 High-Strain Linepipe for Strain-Based Design Application
2008 7th International Pipeline Conference Volume 3, 2008Co-Authors: Satoshi Igi, Joe Zhou, Joe Kondo, Nobuhisa Suzuki, Da-ming DuanAbstract:In recent years, several natural gas pipeline projects have been planned for permafrost regions. Pipelines laid in such areas are subjected to large plastic deformation as a result of ground movement due to repeated thawing and freezing of the frozen ground. Likewise, in pipeline design methods, research on application of Strain-based design as an alternative to the conventional stress-based design method has begun. Much effort has been devoted to the application of Strain-based design to high strength linepipe materials. In order to verify the applicability of high-Strain X100 linepipe to long distance transmission, a large-scale X100 pipeline was constructed using linepipe with an OD of 42″ and wall thickness of 14.3mm. This paper presents the results of experiments and Finite Element Analysis (FEA) focusing on the Strain Capacity of high-Strain X100 linepipes. The critical compressive Strain of X100 high-Strain linepipes is discussed based on the results of FEA taking into account geometric imperfections. The critical tensile Strain for high-Strain X100 pipelines is obtained based on a curved wide plate (CWP) tensile test using specimens taken from girth welded joints. Specifically, the effect of external coating treatment on the Strain Capacity of X100 high-Strain linepipe is investigated. The Strain Capacity of the 42″ X100 pipeline is considered by comparing the tensile Strain limit obtained from girth weld fracture and critical compressive Strain which occurs in local buckling under pure bending deformation.Copyright © 2008 by ASME
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Material Development and Strain Capacity of Grade X100 High Strain Linepipe Produced by Heat Treatment Online Process
2008 7th International Pipeline Conference Volume 3, 2008Co-Authors: Nobuyuki Ishikawa, Joe Kondo, Junji Shimamura, Shigeru Endo, Ryuji Muraoka, Mitsuhiro Okatsu, Nobuo Shikanai, Nobuhisa SuzukiAbstract:Linepipes installed in permafrost ground or seismic region, where larger Strains can be expected by ground movement, are required to have sufficient Strain Capacity in order to prevent local buckling or girth weld fracture. On the other hand, Strain Capacity of linepipes usually degreases with increasing strength, and this is one of the reasons for preventing wider use of high-grade linepipe for high Strain application. Furthermore, external coating is necessary for corrosion resistance of pipe, but coating heat can cause Strain-aged hardening, which results in increased yield strength and Y/T. Therefore, there is a strong demand for developing high strength linepipe for a high Strain application with resistance to Strain-aged hardening. Extensive studies to develop Grade X100 high Strain linepipe have been conducted. One of the key technologies for improving Strain Capacity is dual-phase microstructural control. Steel plate with the microstructure including bainite and dispersed martensite-austenite constituent (MA) can be obtained by applying accelerated cooling followed by heat treatment online process (HOP). HOP is the induction heating process that enables rapid heating of the steel plates. Variety of microstructural control, such as fine carbide precipitation and MA formation, can be utilized by this newly developed heating process. One of the significant features of the HOP process is to improve resistance to Strain-aged hardening. Increase in yield strength by coating can be minimized even for the Grade X100 linepipe. Trial production of X100 high Strain linepipe with the size of 36″ OD and 15mm WT was conducted by applying the HOP process. Microstructural characteristics and mechanical properties of developed X100 linepipe are introduced in this paper. In order to evaluate compressive Strain Capacity of the developed pipe, full-scale pipe bending test was carried out by using the trial X100 high Strain linepipe after external coating. Full scale bending test of developed X100 linepipe demonstrated sufficient compressive Strain Capacity even after external coating.Copyright © 2008 by ASME
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Strain Capacity of High-Strength Line Pipes
2008Co-Authors: Nobuhisa Suzuki, Joe Kondo, Junji ShimamuraAbstract:Two compression and two bending tests using X80 high-Strain line pipes with 30 inches (762 mm) in outside diameter were conducted to investigate its compression Capacity and bending Capacity. The compression test revealed that the pipes had the critical compressive Strain of 0.90 and 0.78% and the bending test clarified that the 20D (two times outside diameter) average critical compressive Strains were 2.40 and 2.15% and the IOD average were 2.67 and 2.28%, respectively. The test results proved that X80 high-Strain linepipes satisfy requirements from pipeline projects and ensure pipeline integrity in seismic and permafrost areas.
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Strain Capacity of X80 High-Strain Line Pipes
Volume 3: Pipeline and Riser Technology; CFD and VIV, 2007Co-Authors: Nobuhisa Suzuki, Joe Kondo, Nobuyuki Ishikawa, Mitsuru Okatsu, Junji ShimamuraAbstract:Two compression tests and two bending tests of X80 high-Strain line pipes were conducted to investigate the compression Capacity and the bending Capacity. The high-Strain line pipes had the outside diameter of 762 mm (30”) and the D/t ratio of 49. The compression tests revealed that the pipes had the critical compressive Strains of 0.90 and 0.78%. The bending tests of the pipes clarified that the 2D average critical compressive Strains were 2.40 and 2.15% and the 1D average were 2.67 and 2.28%. The analytical solutions gave very fine predictions about the critical compressive stress and Strain of the pipes subjected to axial compression. Based on the FEA results, while almost no effects of the geometric imperfections on the compression Capacity were recognized, the effects of the geometric imperfections on the bending Capacity were significant.Copyright © 2007 by ASME
Joe Kondo - One of the best experts on this subject based on the ideXlab platform.
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Girth Weld Strength Matching Effect on Tensile Strain Capacity of Grade X70 High Strain Line Pipe
Volume 2: Pipeline Safety Management Systems; Project Management Design Construction and Environmental Issues; Strain Based Design; Risk and Reliabili, 2018Co-Authors: Hisakazu Tajika, Takahiro Sakimoto, Tsunehisa Handa, Rinsei Ikeda, Joe KondoAbstract:Recently high grade pipeline project have been planned in hostile environment like landslide in mountain area, liquefaction in reclaimed land or the frost heave in Polar Regions. Geohazards bring large scale ground deformation and effect on the varied pipeline to cause large deformation. Therefore, Strain Capacity is important for the pipeline and Strain based design is also needed to keep gas transportation project in safe. High grade steel pipe for linepipe tends to have higher yield to tensile (Y/T) ratio and it has been investigated that the lower Y/T ratio of the material improves Strain Capacity in buckling and tensile limit state. In onshore pipeline project, pipe usually transported in 12 or 18m each and jointed in the field. Girth weld (GW) is indispensable so strength matching of girth weld towards pipe body is important. In this study Strain Capacity of Grade X70 high Strain pipes with size of 36″ OD and 23mm WT was investigated with two types of experiments, which are full scale pipe bending tests and curved wide plate tests. The length of the specimen of full scale bending tests were approximately 8m and girth weld was made in the middle of joint length. A fixed internal pressure was applied during the bending test. Actual pipe situation in work was simulated and both circumferential and longitudinal stress occurred in this test. Test pipes were cut and welded, GTAW in first two layer and then finished by GMAW. In one pipe, YS-TS over-matching girth weld (OVM) joint was prepared considering the pipe body grade. For the other pipe, intentionally under-matching girth weld (UDM) joint was prepared. After the girth welding, elliptical EDM notch were installed in the GW HAZ as simulated weld defect. In both pipe bending tests, the buckling occurred in the pipe body at approximately 300mm apart from the GW and after that, deformation concentrated to buckling wrinkle. Test pipe breaking locations were different in the two tests. In OVM, tensile rupture occurred in pipe body on the backside of buckling wrinkle. In UDM, tensile rupture occurred from notch in the HAZ. In CWP test, breaking location was the HAZ notch. There were significant differences in CTOD growth in HAZ notch in these tests.
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Strain Capacity Investigation on Grade X70 High Strain Line Pipe With Girth Weld
Volume 6B: Materials and Fabrication, 2018Co-Authors: Hisakazu Tajika, Takahiro Sakimoto, Tsunehisa Handa, Rinsei Ikeda, Joe KondoAbstract:Recently high grade pipeline project have been planned in hostile environment like landslide in mountain area, liquefaction in reclaimed land or the frost heave in Polar Regions. Geohazards bring large scale ground deformation and effect on the varied pipeline to cause large deformation. Therefore, Strain Capacity is important for the pipeline and Strain based design is also needed to keep gas transportation project in safe. High grade steel pipe for linepipe tends to have higher yield to tensile (Y/T) ratio and it has been investigated that the lower Y/T ratio of the material improves Strain Capacity in buckling and tensile limit state. In onshore pipeline project, pipe usually transported in 12 or 18m each and jointed in the field. Girth weld (GW) is indispensable so strength matching of girth weld towards pipe body is important. In this study Strain Capacity of Grade X70 high Strain pipe with size of 36” OD and 23mm WT was investigated with two types of experiments. One was a pipe bending test with whole pipe. The length of the specimen was approximately 8m and GW was made in the middle of joint length. A fixed internal pressure was applied during the bending test. Actual pipe situation in work was simulated and both circumferential and longitudinal stress occurred in this test. The other test was curved wide plate (CWP) test. In both tests, test pipes were cut and welded using GTAW in the first two layers and GMAW for the subsequent passes. Welding wire of TG-S62 and MG-S58P were used for GTAW and GMAW respectively to achieve over-matching girth weld considering the pipe body strength. Elliptical EDM notch was installed in the GW HAZ as simulated weld defect. In pipe bending test, buckling occurred at the intrados at 300 mm apart from the GW. 2D average compressive Strain at buckling was 3.59% and this high compressive Strain was considered to derive from the high Strain Capacity of this pipes. After the buckling, deformation concentrated to the buckling wrinkle. Test pipe broke at 35.5 degrees of pipe end rotation and the location was in base metal at the extrados opposite to the buckling wrinkle. The HAZ notch opened and CTOD was 1.44 mm and the global Strain in 2D length average Strain was 7.8%. In CWP test, tensile Strain simply got large and pipe finally broke at global Strain of 9.6% and CTOD of 15 mm. The break location was the HAZ notch. There was a significant difference in CTOD growth in HAZ between two test types. Conditions and factors that effect to these differences are argued in this paper.
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Strain Capacity of X100 High-Strain Linepipe for Strain-Based Design Application
2008 7th International Pipeline Conference Volume 3, 2008Co-Authors: Satoshi Igi, Joe Zhou, Joe Kondo, Nobuhisa Suzuki, Da-ming DuanAbstract:In recent years, several natural gas pipeline projects have been planned for permafrost regions. Pipelines laid in such areas are subjected to large plastic deformation as a result of ground movement due to repeated thawing and freezing of the frozen ground. Likewise, in pipeline design methods, research on application of Strain-based design as an alternative to the conventional stress-based design method has begun. Much effort has been devoted to the application of Strain-based design to high strength linepipe materials. In order to verify the applicability of high-Strain X100 linepipe to long distance transmission, a large-scale X100 pipeline was constructed using linepipe with an OD of 42″ and wall thickness of 14.3mm. This paper presents the results of experiments and Finite Element Analysis (FEA) focusing on the Strain Capacity of high-Strain X100 linepipes. The critical compressive Strain of X100 high-Strain linepipes is discussed based on the results of FEA taking into account geometric imperfections. The critical tensile Strain for high-Strain X100 pipelines is obtained based on a curved wide plate (CWP) tensile test using specimens taken from girth welded joints. Specifically, the effect of external coating treatment on the Strain Capacity of X100 high-Strain linepipe is investigated. The Strain Capacity of the 42″ X100 pipeline is considered by comparing the tensile Strain limit obtained from girth weld fracture and critical compressive Strain which occurs in local buckling under pure bending deformation.Copyright © 2008 by ASME
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Material Development and Strain Capacity of Grade X100 High Strain Linepipe Produced by Heat Treatment Online Process
2008 7th International Pipeline Conference Volume 3, 2008Co-Authors: Nobuyuki Ishikawa, Joe Kondo, Junji Shimamura, Shigeru Endo, Ryuji Muraoka, Mitsuhiro Okatsu, Nobuo Shikanai, Nobuhisa SuzukiAbstract:Linepipes installed in permafrost ground or seismic region, where larger Strains can be expected by ground movement, are required to have sufficient Strain Capacity in order to prevent local buckling or girth weld fracture. On the other hand, Strain Capacity of linepipes usually degreases with increasing strength, and this is one of the reasons for preventing wider use of high-grade linepipe for high Strain application. Furthermore, external coating is necessary for corrosion resistance of pipe, but coating heat can cause Strain-aged hardening, which results in increased yield strength and Y/T. Therefore, there is a strong demand for developing high strength linepipe for a high Strain application with resistance to Strain-aged hardening. Extensive studies to develop Grade X100 high Strain linepipe have been conducted. One of the key technologies for improving Strain Capacity is dual-phase microstructural control. Steel plate with the microstructure including bainite and dispersed martensite-austenite constituent (MA) can be obtained by applying accelerated cooling followed by heat treatment online process (HOP). HOP is the induction heating process that enables rapid heating of the steel plates. Variety of microstructural control, such as fine carbide precipitation and MA formation, can be utilized by this newly developed heating process. One of the significant features of the HOP process is to improve resistance to Strain-aged hardening. Increase in yield strength by coating can be minimized even for the Grade X100 linepipe. Trial production of X100 high Strain linepipe with the size of 36″ OD and 15mm WT was conducted by applying the HOP process. Microstructural characteristics and mechanical properties of developed X100 linepipe are introduced in this paper. In order to evaluate compressive Strain Capacity of the developed pipe, full-scale pipe bending test was carried out by using the trial X100 high Strain linepipe after external coating. Full scale bending test of developed X100 linepipe demonstrated sufficient compressive Strain Capacity even after external coating.Copyright © 2008 by ASME
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Strain Capacity of High-Strength Line Pipes
2008Co-Authors: Nobuhisa Suzuki, Joe Kondo, Junji ShimamuraAbstract:Two compression and two bending tests using X80 high-Strain line pipes with 30 inches (762 mm) in outside diameter were conducted to investigate its compression Capacity and bending Capacity. The compression test revealed that the pipes had the critical compressive Strain of 0.90 and 0.78% and the bending test clarified that the 20D (two times outside diameter) average critical compressive Strains were 2.40 and 2.15% and the IOD average were 2.67 and 2.28%, respectively. The test results proved that X80 high-Strain linepipes satisfy requirements from pipeline projects and ensure pipeline integrity in seismic and permafrost areas.
Junji Shimamura - One of the best experts on this subject based on the ideXlab platform.
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buckling and tensile Strain Capacity of girth welded 48 x80 pipeline
ASME 2013 32nd International Conference on Ocean Offshore and Arctic Engineering, 2013Co-Authors: Mitsuru Ohata, Takahiro Sakimoto, Junji Shimamura, Kenji OiAbstract:This paper presents the experimental and analytical results focused on the compressive and tensile Strain Capacity of X80 linepipe. A full-scale bending test of girth welded 48″ OD X80 linepipes was conducted to investigate the compressive Strain limit regarding to the local buckling and tensile Strain limit regarding to the girth weld fracture. As for the compressive buckling behavior, one large developing wrinkle and some small wrinkles on the pipe surface were captured relatively well from observation and Strain distribution measurement after pipe reaches its endurable maximum bending moment. The tensile Strain limit is discussed from the viewpoint of competition of two fracture phenomena: ductile crack initiation / propagation from an artificial notch at the HAZ of the girth weld, and Strain concentration and necking / rupture in the base material.The ductile crack growth behavior from the girth weld notch is simulated by FE-analysis based on the proposed damage model, and compared with the experimental results. In this report, it is also demonstrated that the simulation model can be applicable to predicting ductile crack growth behaviors from a circumferentially notched girth welded pipe with internal high pressure subjected to post-buckling loading.Copyright © 2013 by ASME
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Buckling and Tensile Strain Capacity of Girth Welded 48″ X80 Pipeline
Volume 3: Materials Technology; Ocean Space Utilization, 2013Co-Authors: Mitsuru Ohata, Takahiro Sakimoto, Junji Shimamura, Kenji OiAbstract:This paper presents the experimental and analytical results focused on the compressive and tensile Strain Capacity of X80 linepipe. A full-scale bending test of girth welded 48″ OD X80 linepipes was conducted to investigate the compressive Strain limit regarding to the local buckling and tensile Strain limit regarding to the girth weld fracture. As for the compressive buckling behavior, one large developing wrinkle and some small wrinkles on the pipe surface were captured relatively well from observation and Strain distribution measurement after pipe reaches its endurable maximum bending moment. The tensile Strain limit is discussed from the viewpoint of competition of two fracture phenomena: ductile crack initiation / propagation from an artificial notch at the HAZ of the girth weld, and Strain concentration and necking / rupture in the base material.The ductile crack growth behavior from the girth weld notch is simulated by FE-analysis based on the proposed damage model, and compared with the experimental results. In this report, it is also demonstrated that the simulation model can be applicable to predicting ductile crack growth behaviors from a circumferentially notched girth welded pipe with internal high pressure subjected to post-buckling loading.Copyright © 2013 by ASME
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Material Development and Strain Capacity of Grade X100 High Strain Linepipe Produced by Heat Treatment Online Process
2008 7th International Pipeline Conference Volume 3, 2008Co-Authors: Nobuyuki Ishikawa, Joe Kondo, Junji Shimamura, Shigeru Endo, Ryuji Muraoka, Mitsuhiro Okatsu, Nobuo Shikanai, Nobuhisa SuzukiAbstract:Linepipes installed in permafrost ground or seismic region, where larger Strains can be expected by ground movement, are required to have sufficient Strain Capacity in order to prevent local buckling or girth weld fracture. On the other hand, Strain Capacity of linepipes usually degreases with increasing strength, and this is one of the reasons for preventing wider use of high-grade linepipe for high Strain application. Furthermore, external coating is necessary for corrosion resistance of pipe, but coating heat can cause Strain-aged hardening, which results in increased yield strength and Y/T. Therefore, there is a strong demand for developing high strength linepipe for a high Strain application with resistance to Strain-aged hardening. Extensive studies to develop Grade X100 high Strain linepipe have been conducted. One of the key technologies for improving Strain Capacity is dual-phase microstructural control. Steel plate with the microstructure including bainite and dispersed martensite-austenite constituent (MA) can be obtained by applying accelerated cooling followed by heat treatment online process (HOP). HOP is the induction heating process that enables rapid heating of the steel plates. Variety of microstructural control, such as fine carbide precipitation and MA formation, can be utilized by this newly developed heating process. One of the significant features of the HOP process is to improve resistance to Strain-aged hardening. Increase in yield strength by coating can be minimized even for the Grade X100 linepipe. Trial production of X100 high Strain linepipe with the size of 36″ OD and 15mm WT was conducted by applying the HOP process. Microstructural characteristics and mechanical properties of developed X100 linepipe are introduced in this paper. In order to evaluate compressive Strain Capacity of the developed pipe, full-scale pipe bending test was carried out by using the trial X100 high Strain linepipe after external coating. Full scale bending test of developed X100 linepipe demonstrated sufficient compressive Strain Capacity even after external coating.Copyright © 2008 by ASME
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Strain Capacity of High-Strength Line Pipes
2008Co-Authors: Nobuhisa Suzuki, Joe Kondo, Junji ShimamuraAbstract:Two compression and two bending tests using X80 high-Strain line pipes with 30 inches (762 mm) in outside diameter were conducted to investigate its compression Capacity and bending Capacity. The compression test revealed that the pipes had the critical compressive Strain of 0.90 and 0.78% and the bending test clarified that the 20D (two times outside diameter) average critical compressive Strains were 2.40 and 2.15% and the IOD average were 2.67 and 2.28%, respectively. The test results proved that X80 high-Strain linepipes satisfy requirements from pipeline projects and ensure pipeline integrity in seismic and permafrost areas.
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Strain Capacity of X80 High-Strain Line Pipes
Volume 3: Pipeline and Riser Technology; CFD and VIV, 2007Co-Authors: Nobuhisa Suzuki, Joe Kondo, Nobuyuki Ishikawa, Mitsuru Okatsu, Junji ShimamuraAbstract:Two compression tests and two bending tests of X80 high-Strain line pipes were conducted to investigate the compression Capacity and the bending Capacity. The high-Strain line pipes had the outside diameter of 762 mm (30”) and the D/t ratio of 49. The compression tests revealed that the pipes had the critical compressive Strains of 0.90 and 0.78%. The bending tests of the pipes clarified that the 2D average critical compressive Strains were 2.40 and 2.15% and the 1D average were 2.67 and 2.28%. The analytical solutions gave very fine predictions about the critical compressive stress and Strain of the pipes subjected to axial compression. Based on the FEA results, while almost no effects of the geometric imperfections on the compression Capacity were recognized, the effects of the geometric imperfections on the bending Capacity were significant.Copyright © 2007 by ASME
Takahiro Sakimoto - One of the best experts on this subject based on the ideXlab platform.
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Girth Weld Strength Matching Effect on Tensile Strain Capacity of Grade X70 High Strain Line Pipe
Volume 2: Pipeline Safety Management Systems; Project Management Design Construction and Environmental Issues; Strain Based Design; Risk and Reliabili, 2018Co-Authors: Hisakazu Tajika, Takahiro Sakimoto, Tsunehisa Handa, Rinsei Ikeda, Joe KondoAbstract:Recently high grade pipeline project have been planned in hostile environment like landslide in mountain area, liquefaction in reclaimed land or the frost heave in Polar Regions. Geohazards bring large scale ground deformation and effect on the varied pipeline to cause large deformation. Therefore, Strain Capacity is important for the pipeline and Strain based design is also needed to keep gas transportation project in safe. High grade steel pipe for linepipe tends to have higher yield to tensile (Y/T) ratio and it has been investigated that the lower Y/T ratio of the material improves Strain Capacity in buckling and tensile limit state. In onshore pipeline project, pipe usually transported in 12 or 18m each and jointed in the field. Girth weld (GW) is indispensable so strength matching of girth weld towards pipe body is important. In this study Strain Capacity of Grade X70 high Strain pipes with size of 36″ OD and 23mm WT was investigated with two types of experiments, which are full scale pipe bending tests and curved wide plate tests. The length of the specimen of full scale bending tests were approximately 8m and girth weld was made in the middle of joint length. A fixed internal pressure was applied during the bending test. Actual pipe situation in work was simulated and both circumferential and longitudinal stress occurred in this test. Test pipes were cut and welded, GTAW in first two layer and then finished by GMAW. In one pipe, YS-TS over-matching girth weld (OVM) joint was prepared considering the pipe body grade. For the other pipe, intentionally under-matching girth weld (UDM) joint was prepared. After the girth welding, elliptical EDM notch were installed in the GW HAZ as simulated weld defect. In both pipe bending tests, the buckling occurred in the pipe body at approximately 300mm apart from the GW and after that, deformation concentrated to buckling wrinkle. Test pipe breaking locations were different in the two tests. In OVM, tensile rupture occurred in pipe body on the backside of buckling wrinkle. In UDM, tensile rupture occurred from notch in the HAZ. In CWP test, breaking location was the HAZ notch. There were significant differences in CTOD growth in HAZ notch in these tests.
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Strain Capacity Investigation on Grade X70 High Strain Line Pipe With Girth Weld
Volume 6B: Materials and Fabrication, 2018Co-Authors: Hisakazu Tajika, Takahiro Sakimoto, Tsunehisa Handa, Rinsei Ikeda, Joe KondoAbstract:Recently high grade pipeline project have been planned in hostile environment like landslide in mountain area, liquefaction in reclaimed land or the frost heave in Polar Regions. Geohazards bring large scale ground deformation and effect on the varied pipeline to cause large deformation. Therefore, Strain Capacity is important for the pipeline and Strain based design is also needed to keep gas transportation project in safe. High grade steel pipe for linepipe tends to have higher yield to tensile (Y/T) ratio and it has been investigated that the lower Y/T ratio of the material improves Strain Capacity in buckling and tensile limit state. In onshore pipeline project, pipe usually transported in 12 or 18m each and jointed in the field. Girth weld (GW) is indispensable so strength matching of girth weld towards pipe body is important. In this study Strain Capacity of Grade X70 high Strain pipe with size of 36” OD and 23mm WT was investigated with two types of experiments. One was a pipe bending test with whole pipe. The length of the specimen was approximately 8m and GW was made in the middle of joint length. A fixed internal pressure was applied during the bending test. Actual pipe situation in work was simulated and both circumferential and longitudinal stress occurred in this test. The other test was curved wide plate (CWP) test. In both tests, test pipes were cut and welded using GTAW in the first two layers and GMAW for the subsequent passes. Welding wire of TG-S62 and MG-S58P were used for GTAW and GMAW respectively to achieve over-matching girth weld considering the pipe body strength. Elliptical EDM notch was installed in the GW HAZ as simulated weld defect. In pipe bending test, buckling occurred at the intrados at 300 mm apart from the GW. 2D average compressive Strain at buckling was 3.59% and this high compressive Strain was considered to derive from the high Strain Capacity of this pipes. After the buckling, deformation concentrated to the buckling wrinkle. Test pipe broke at 35.5 degrees of pipe end rotation and the location was in base metal at the extrados opposite to the buckling wrinkle. The HAZ notch opened and CTOD was 1.44 mm and the global Strain in 2D length average Strain was 7.8%. In CWP test, tensile Strain simply got large and pipe finally broke at global Strain of 9.6% and CTOD of 15 mm. The break location was the HAZ notch. There was a significant difference in CTOD growth in HAZ between two test types. Conditions and factors that effect to these differences are argued in this paper.
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buckling and tensile Strain Capacity of girth welded 48 x80 pipeline
ASME 2013 32nd International Conference on Ocean Offshore and Arctic Engineering, 2013Co-Authors: Mitsuru Ohata, Takahiro Sakimoto, Junji Shimamura, Kenji OiAbstract:This paper presents the experimental and analytical results focused on the compressive and tensile Strain Capacity of X80 linepipe. A full-scale bending test of girth welded 48″ OD X80 linepipes was conducted to investigate the compressive Strain limit regarding to the local buckling and tensile Strain limit regarding to the girth weld fracture. As for the compressive buckling behavior, one large developing wrinkle and some small wrinkles on the pipe surface were captured relatively well from observation and Strain distribution measurement after pipe reaches its endurable maximum bending moment. The tensile Strain limit is discussed from the viewpoint of competition of two fracture phenomena: ductile crack initiation / propagation from an artificial notch at the HAZ of the girth weld, and Strain concentration and necking / rupture in the base material.The ductile crack growth behavior from the girth weld notch is simulated by FE-analysis based on the proposed damage model, and compared with the experimental results. In this report, it is also demonstrated that the simulation model can be applicable to predicting ductile crack growth behaviors from a circumferentially notched girth welded pipe with internal high pressure subjected to post-buckling loading.Copyright © 2013 by ASME
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Buckling and Tensile Strain Capacity of Girth Welded 48″ X80 Pipeline
Volume 3: Materials Technology; Ocean Space Utilization, 2013Co-Authors: Mitsuru Ohata, Takahiro Sakimoto, Junji Shimamura, Kenji OiAbstract:This paper presents the experimental and analytical results focused on the compressive and tensile Strain Capacity of X80 linepipe. A full-scale bending test of girth welded 48″ OD X80 linepipes was conducted to investigate the compressive Strain limit regarding to the local buckling and tensile Strain limit regarding to the girth weld fracture. As for the compressive buckling behavior, one large developing wrinkle and some small wrinkles on the pipe surface were captured relatively well from observation and Strain distribution measurement after pipe reaches its endurable maximum bending moment. The tensile Strain limit is discussed from the viewpoint of competition of two fracture phenomena: ductile crack initiation / propagation from an artificial notch at the HAZ of the girth weld, and Strain concentration and necking / rupture in the base material.The ductile crack growth behavior from the girth weld notch is simulated by FE-analysis based on the proposed damage model, and compared with the experimental results. In this report, it is also demonstrated that the simulation model can be applicable to predicting ductile crack growth behaviors from a circumferentially notched girth welded pipe with internal high pressure subjected to post-buckling loading.Copyright © 2013 by ASME
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Tensile Strain Capacity of X80 girth welded linepipes and crack growth analysis
Volume 6: Materials Technology; Polar and Arctic Sciences and Technology; Petroleum Technology Symposium, 2012Co-Authors: Satoshi Igi, Takahiro Sakimoto, Shigeru Endo, Ryuji Muraoka, Takekazu ArakawaAbstract:This paper examines the tensile Strain Capacity of girth welded pipelines. A pressurized and no pressurized full-pipe tension tests were conducted together with FE analyses in order to investigate the Strain behavior of pipe under large axial loading with high internal pressure. The critical tensile Strain drastically decreased under a high internal pressure condition. Single edge notch tension (SENT) tests with shallow notched specimens were also performed to obtain the material resistance curve (R-curve), and a series of FE analyses was conducted to obtain the crack driving force for ductile crack propagation. The R-curve and crack driving force curve were used in predicting the tensile Strain limit of X80 girth welded pipe with a surface defect in the HAZ. The predicted critical tensile Strain showed good agreement with that obtained in the pressurized and no pressurized full-pipe tension test.Copyright © 2012 by ASME
Satoshi Igi - One of the best experts on this subject based on the ideXlab platform.
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Strain Capacity and Deformation Behavior of HFW Linepipe
Volume 2: Pipeline Safety Management Systems; Project Management Design Construction and Environmental Issues; Strain Based Design; Risk and Reliabili, 2016Co-Authors: Satoshi Igi, Satoru Yabumoto, Teruki Sadasue, Hisakazu TajikaAbstract:Newly-developed high quality high frequency electric resistance welded (HFW) linepipes have recently been applied to offshore pipelines by using the reel-lay method and onshore in extremely low temperature environments because of their excellent low temperature weld toughness and cost effectiveness. In order to clarify the applicability of these HFW linepipes to seismic regions, a series of full-scale tests such as the bending test with internal pressure and the uniaxial compression test were conducted according to the seismic design code of the Japan Gas Association (JGA). Based on these full-scale tests, the safety performance of high quality HFW linepipe when applied to seismic regions is discussed in comparison with the mechanical properties obtained in small-scale tests, such as the tensile and compression properties of the base material and weld seam, focusing especially on the compressive and tensile Strain Capacity of HFW linepipes from the viewpoints of full-scale performance and geometrical imperfections. The results of the bending test under internal pressure and the uniaxial compression test without internal pressure complied with the JGA seismic design code for permanent ground deformation induced by lateral spreading and surface faults. In addition, a full-pipe tension test was also conducted in order to investigate the tensile Strain Capacity of HFW linepipes for axial deformation.
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Tensile Strain Capacity of X80 girth welded linepipes and crack growth analysis
Volume 6: Materials Technology; Polar and Arctic Sciences and Technology; Petroleum Technology Symposium, 2012Co-Authors: Satoshi Igi, Takahiro Sakimoto, Shigeru Endo, Ryuji Muraoka, Takekazu ArakawaAbstract:This paper examines the tensile Strain Capacity of girth welded pipelines. A pressurized and no pressurized full-pipe tension tests were conducted together with FE analyses in order to investigate the Strain behavior of pipe under large axial loading with high internal pressure. The critical tensile Strain drastically decreased under a high internal pressure condition. Single edge notch tension (SENT) tests with shallow notched specimens were also performed to obtain the material resistance curve (R-curve), and a series of FE analyses was conducted to obtain the crack driving force for ductile crack propagation. The R-curve and crack driving force curve were used in predicting the tensile Strain limit of X80 girth welded pipe with a surface defect in the HAZ. The predicted critical tensile Strain showed good agreement with that obtained in the pressurized and no pressurized full-pipe tension test.Copyright © 2012 by ASME
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effect of internal pressure on tensile Strain Capacity of x80 pipeline
Procedia Engineering, 2011Co-Authors: Satoshi Igi, Takahiro Sakimoto, Shigeru EndoAbstract:Abstract This paper examines the influence of internal pressure on the tensile Strain Capacity of pipelines. A pressurized full-pipe tension test and curved wide plate (CWP) test were conducted together with FE analyses in order to investigate the Strain behavior of pipe under large axial loading with high internal pressure. The critical tensile Strain drastically decreased under a high internal pressure condition. Single edge notch tension (SENT) tests with shallow notched specimens were also performed to obtain the material resistance curve (R-curve), and a series of FE analyses was conducted to obtain the crack driving force for ductile crack propagation. The R-curve and crack driving force curve were used in predicting the tensile Strain limit of X80 girth welded pipe with a surface defect in the HAZ. The predicted critical tensile Strain showed good agreement with that obtained in the pressurized full-pipe tension test. These results demonstrate that the tensile Strain Capacity of pressurized pipes can be predicted by using the R-curve from SENT tests and the crack driving force curve from FE analyses.
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Tensile Strain Capacity of X80 Pipeline Under Tensile Loading With Internal Pressure
2010 8th International Pipeline Conference Volume 4, 2010Co-Authors: Satoshi Igi, Takahiro Sakimoto, Ryuji Muraoka, Nobuhisa Suzuki, Takekazu ArakawaAbstract:This paper presents the results of experimental and finite element analysis (FEA) studies focused on the tensile Strain Capacity of X80 pipelines under large axial loading with high internal pressure. Full-pipe tensile test of girth welded joint was performed using high-Strain X80 linepipes. Curved wide plate (CWP) tests were also conducted to verify the Strain Capacity under a condition of no internal pressure. The influence of internal pressure was clearly observed in the Strain Capacity. Critical tensile Strain is reduced drastically due to the increased crack driving force under high internal pressure. In addition, SENT tests with shallow notch specimens were conducted in order to obtain a tearing resistance curve for the simulated HAZ of X80 material. Crack driving force curves were obtained by a series of FEA, and the critical global Strain of pressurized pipes was predicted to verify the Strain Capacity of X80 welded linepipes with surface defects. Predicted Strain showed good agreement with the experimental results.Copyright © 2010 by ASME
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Strain Capacity and material properties required for pipelines
Welding International, 2008Co-Authors: N. Suzuki, T. Kubo, Satoshi IgiAbstract:(2008). Strain Capacity and material properties required for pipelines. Welding International: Vol. 22, No. 7, pp. 417-420.
