The Experts below are selected from a list of 446565 Experts worldwide ranked by ideXlab platform
Yunxia Chen - One of the best experts on this subject based on the ideXlab platform.
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α-S-N Curve: A novel S-N Curve modeling method under small-sample test data using uncertainty theory
International Journal of Fatigue, 2020Co-Authors: Rui Kang, Meilin Wen, Yunxia ChenAbstract:Abstract Considering the unconvincing results produced by probability theory when dealing with small sample data, this paper introduces uncertainty theory (a branch of axiomatic mathematics parallel to probability theory) to model and estimate the uncertainty of fatigue life with the small sample of fatigue test data. A new method called α -S-N Curves is firstly proposed to describe the relationship between fatigue life and stress levels. Subsequently, general procedures are established for the determination of α -S-N Curves based on the four basic assumptions to improve the information utilized in the estimation process and overcome the large-scatter of the small sample fatigue failure data. Finally, the developed procedures are verified by the data of aluminum alloy data and laminate panel data. The precision and stability of the developed procedures are validated by the index relative slope in comparison with the method stated in ISO 12107.
Adam Lipski - One of the best experts on this subject based on the ideXlab platform.
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Determination of the S-N Curve and the fatigue limit by means of the thermographic method for ductile cast iron
2018Co-Authors: Adam LipskiAbstract:The thermographic method enables accelerated simultaneous determination of the S-N Curve and the fatigue limit was presented in this paper. All fatigue parameters can be determined by using the same gradually increasing loading test data. The application of this method was presented on an example of EN-GJS-500-7 (GGG50) ductile cast iron. The S-N Curve and the fatigue limit by thermographic and the Locati methods were determined. The application of this method significantly reduced cost of fatigue tests by reduction of the quantity of specimens and shortening test duration.The thermographic method enables accelerated simultaneous determination of the S-N Curve and the fatigue limit was presented in this paper. All fatigue parameters can be determined by using the same gradually increasing loading test data. The application of this method was presented on an example of EN-GJS-500-7 (GGG50) ductile cast iron. The S-N Curve and the fatigue limit by thermographic and the Locati methods were determined. The application of this method significantly reduced cost of fatigue tests by reduction of the quantity of specimens and shortening test duration.
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Accelerated Determination of Fatigue Limit and S-N Curve by Means of Thermographic Method for X5CrNi18-10 Steel
Acta Mechanica et Automatica, 2016Co-Authors: Adam LipskiAbstract:A new thermographic method that enables simultaneous accelerated determination of the fatigue limit and the S-N Curve was presented in this paper. The fatigue limit determination method was based on a constant rate of temperature rise occurring in second phase of the specimen fatigue life. The S-N Curve determination method was based on energetic parameter with assumption of its de- pendency on the stress amplitude. The tests made on X5CrNi18-10 steel under reversed bending revealed that the fatigue limit value ob- tained from accelerated thermographic tests as compared to the value obtained from full test differs by 5.0 %. The S-N Curve obtained by accelerated thermographic method fits inside 95 % confidence interval for the S-N Curve obtained from full test.
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accelerated determination of the fatigue limit and the s n Curve by means of the thermographic method for x5crni18 10 steel
Acta Mechanica et Automatica, 2016Co-Authors: Adam LipskiAbstract:A new thermographic method that enables simultaneous accelerated determination of the fatigue limit and the S-N Curve was presented in this paper. The fatigue limit determination method was based on a constant rate of temperature rise occurring in second phase of the specimen fatigue life. The S-N Curve determination method was based on energetic parameter with assumption of its de- pendency on the stress amplitude. The tests made on X5CrNi18-10 steel under reversed bending revealed that the fatigue limit value ob- tained from accelerated thermographic tests as compared to the value obtained from full test differs by 5.0 %. The S-N Curve obtained by accelerated thermographic method fits inside 95 % confidence interval for the S-N Curve obtained from full test.
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Rapid Determination of the S-N Curve for Steel by means of the Thermographic Method
Advances in Materials Science and Engineering, 2016Co-Authors: Adam LipskiAbstract:The paper presents a thermographic method of accelerated determination of the S-N Curve. In the presented method, the S-N Curve was developed based on energy-related parameter with the assumption of its dependency on the stress amplitude. The tests made on C45 steel and X5CrNi18-10 steel under reversed bending revealed that the S-N Curve obtained by accelerated thermographic method fits inside the 95% confidence interval for the S-N Curve obtained from the full test.
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Accelerated Determination of the Fatigue Limit and the S-N Curve by Means of the Thermographic Method for C45 Steel
Solid State Phenomena, 2016Co-Authors: Adam LipskiAbstract:The paper presents a new thermographic method that enables simultaneous accelerated determination of the fatigue limit and the S-N Curve. In the presented method, the fatigue limit was determined assuming a constant rate of temperature rise occurring in the second phase of a specimen fatigue life. The S-N Curve was developed based on energy-related parameter with the assumption of its dependency on the stress amplitude. The tests made on C45 steel under reversed bending revealed that the fatigue limit value obtained from accelerated thermographic tests as compared to the value obtained using Staircase method differs by 10.0% maximum.The S-N Curve obtained by accelerated thermographic method fits inside 95% confidence interval for the S-N Curve obtained from the full test.
Kenta Komano - One of the best experts on this subject based on the ideXlab platform.
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on the sharp bend of the s n Curve and the crack propagation behavior of extruded magnesium alloy
Scripta Materialia, 2007Co-Authors: Z Y Nan, Sotomi Ishihara, Hiroshi Shibata, Arthur J. Mcevily, Kenta KomanoAbstract:Rotating bending fatigue tests were carried out using an extruded magnesium alloy in order to determine the shape of its S–N Curve, and the crack initiation and propagation behavior. It was found that a well-defined knee in the S–N Curve was related to the layered microstructure of the alloy, and that fatigue cracks initiated early stage in the fatigue life. The crack propagation behavior was analyzed using a modified linear elastic fracture mechanics parameter to predict crack growth behavior and the fatigue lifetimes.
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On the sharp bend of the S–N Curve and the crack propagation behavior of extruded magnesium alloy
Scripta Materialia, 2007Co-Authors: Z Y Nan, Sotomi Ishihara, Hiroshi Shibata, Arthur J. Mcevily, Kenta KomanoAbstract:Rotating bending fatigue tests were carried out using an extruded magnesium alloy in order to determine the shape of its S–N Curve, and the crack initiation and propagation behavior. It was found that a well-defined knee in the S–N Curve was related to the layered microstructure of the alloy, and that fatigue cracks initiated early stage in the fatigue life. The crack propagation behavior was analyzed using a modified linear elastic fracture mechanics parameter to predict crack growth behavior and the fatigue lifetimes.
Sotomi Ishihara - One of the best experts on this subject based on the ideXlab platform.
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on the sharp bend of the s n Curve and the crack propagation behavior of extruded magnesium alloy
Scripta Materialia, 2007Co-Authors: Z Y Nan, Sotomi Ishihara, Hiroshi Shibata, Arthur J. Mcevily, Kenta KomanoAbstract:Rotating bending fatigue tests were carried out using an extruded magnesium alloy in order to determine the shape of its S–N Curve, and the crack initiation and propagation behavior. It was found that a well-defined knee in the S–N Curve was related to the layered microstructure of the alloy, and that fatigue cracks initiated early stage in the fatigue life. The crack propagation behavior was analyzed using a modified linear elastic fracture mechanics parameter to predict crack growth behavior and the fatigue lifetimes.
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On the sharp bend of the S–N Curve and the crack propagation behavior of extruded magnesium alloy
Scripta Materialia, 2007Co-Authors: Z Y Nan, Sotomi Ishihara, Hiroshi Shibata, Arthur J. Mcevily, Kenta KomanoAbstract:Rotating bending fatigue tests were carried out using an extruded magnesium alloy in order to determine the shape of its S–N Curve, and the crack initiation and propagation behavior. It was found that a well-defined knee in the S–N Curve was related to the layered microstructure of the alloy, and that fatigue cracks initiated early stage in the fatigue life. The crack propagation behavior was analyzed using a modified linear elastic fracture mechanics parameter to predict crack growth behavior and the fatigue lifetimes.
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fatigue subsurface fatigue crack initiation behavior and s n Curve characteristics in high carbon chromium bearing steel
Journal of The Society of Materials Science Japan, 1999Co-Authors: Kazuaki Shiozawa, Sotomi IshiharaAbstract:In order to investigate high cycle long life fatigue characteristics, cantilever-type rotary bending fatigue tests were conducted in an open environment at room temperature using hourglass shaped specimens of high carbonchromium bearing steel. The S-N Curve obtained was clearly classified fracture modes into two groups of different crack origin. One was governed by a crystal slip on the specimen surface which occurred in the region of short fatigue life and high stress amplitude level. The other was governed by nonmetallic inclusion at subsurface which occurred in the region of long fatigue life and low stress amplitude. The inclusion governed fish-eye fracture mode was distributed in a wide range of stress amplitude not only below the fatigue limit defined as the threshold of fracture due to the slip governed mode but also above the fatigue limit. This remarkable shape of the S-N Curve was different from a step-wise one reported in previous literature and was characterized as duplex S-N Curves which composed of two different S-N Curves corresponding to the respective fracture modes. An examination of the initial stress intensity factor range of fracture origin, ΔKini, showed that the ΔKini of the slip governed fracture mode was larger than the threshold stress intensity factor range of the surface crack growth, ΔKth. On the other hand, cracks originate and propagate from inclusion at subsurface with smaller ΔKini than the slip-originating crack and the ΔKth.
Rui Kang - One of the best experts on this subject based on the ideXlab platform.
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α-S-N Curve: A novel S-N Curve modeling method under small-sample test data using uncertainty theory
International Journal of Fatigue, 2020Co-Authors: Rui Kang, Meilin Wen, Yunxia ChenAbstract:Abstract Considering the unconvincing results produced by probability theory when dealing with small sample data, this paper introduces uncertainty theory (a branch of axiomatic mathematics parallel to probability theory) to model and estimate the uncertainty of fatigue life with the small sample of fatigue test data. A new method called α -S-N Curves is firstly proposed to describe the relationship between fatigue life and stress levels. Subsequently, general procedures are established for the determination of α -S-N Curves based on the four basic assumptions to improve the information utilized in the estimation process and overcome the large-scatter of the small sample fatigue failure data. Finally, the developed procedures are verified by the data of aluminum alloy data and laminate panel data. The precision and stability of the developed procedures are validated by the index relative slope in comparison with the method stated in ISO 12107.
