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Masao Sakane - One of the best experts on this subject based on the ideXlab platform.

  • development of miniature Cruciform Specimen and testing machine for multiaxial creep investigation
    Theoretical and Applied Fracture Mechanics, 2020
    Co-Authors: Noritake Hiyoshi, Masao Sakane, Takafumi Tsurui, Takamoto Itoh, Masaaki Tsurui, Chiaki Hisaka
    Abstract:

    Abstract High temperature components such as boiler tubes and jet engine turbine blades undergo multiaxial creep damage due to extreme temperature conditions and their complex shapes. A multiaxial creep investigation is required for the safety of high temperature components in the design phase of the manufacture of such a component. However, there are only a few commercial testing machines that can conduct multiaxial loading at high temperatures. A miniature Cruciform Specimen having a plane stress condition gauge section that is 5 mm square was designed using finite element (FE) analysis. Further, a biaxial testing machine capable of tensile loading was designed to conduct multiaxial creep tests. The testing machine had a 2 kN loading capacity and a 1 kW furnace. We also developed a non-contact displacement measuring method for the miniature Specimen, which had an excessively small gauge section to permit the attachment of a mechanical extensometer. The proposed method uses a conventional optical camera to capture some images of the surface. We obtained the displacement value of the Specimen, by tracking the trace of the target marks painted on the surface of the Specimen. The measured strain value that was obtained from the non-contact displacement measuring method corresponds to the strain obtained by the mechanical method at room and high temperatures. By using the developed multiaxial creep testing machine and the non-contact observation system, we can investigate not only the deformation of the testing Specimen, but also the surface conditions of materials during the creep test.

  • multiaxial creep fatigue life prediction for Cruciform Specimen
    International Journal of Fatigue, 2007
    Co-Authors: Shengde Zhang, Masao Sakane
    Abstract:

    Abstract This paper describes the high temperature multiaxial creep–fatigue life prediction for type 304 stainless steel. Finite element analyses were performed for determining the stress–strain state in the gage part of a Cruciform Specimen subjected to creep–fatigue loading under four strain waves at three principal strain ratios. Creep–fatigue lives of Cruciform Specimens were discussed in relation to the principal stress amplitude calculated by finite element analysis. Creep–fatigue damage was evaluated by linear damage rule and the suitability of three low cycle fatigue and three creep damage parameters was discussed.

  • Multiaxial creep-fatigue life using Cruciform Specimen
    International Journal of Fatigue, 2007
    Co-Authors: Shengde Zhang, Kunimasa Ozaki, Masaya Harada, Masao Sakane
    Abstract:

    Abstract This paper studies the multiaxial creep–fatigue life for type 304 stainless steel at elevated temperature. Strain controlled biaxial tension–compression creep–fatigue tests were carried out using Cruciform Specimens under four strain waves at three principal strain ratios. The strain wave and the principal strain ratio had a significant effect on creep–fatigue life of the Cruciform Specimen. The creep–fatigue life ratio decreased as the principal strain ratio increased which indicates that larger creep damage occurred at larger principal strain ratio. The effects of the strain wave and principal strain ratio were discussed in relation to the observations of surface crack and void area density in the gage part of the Specimen.

  • equi biaxial tension compression low cycle fatigue for type 304 and cr mo v Cruciform Specimen
    ASME 2003 Pressure Vessels and Piping Conference, 2003
    Co-Authors: Takamoto Itoh, Masao Sakane
    Abstract:

    This paper describes high temperature multiaxial low cycle fatigue lives of type 304 stainless steel and 1Cr-1Mo-1/4V steel Cruciform Specimens at 823K and 923K in air. Strain controlled multiaxial low cycle fatigue tests were carried out using Cruciform Specimens at the principal strain ratios between −1 and 1. The principal strain ratio had a significant effect on low cycle fatigue lives. Fatigue lives drastically decreased as the principal strain ratio increased. Multiaxial low cycle fatigue strain parameters were applied to the experimental data and the applicability of the parameters was discussed. The equivalent strain based on crack opening displacement (COD strain) developed in the paper and Γ*-plane parameter successfully predicted multiaxial low cycle fatigue lives. The crack morphology was also extensively discussed from not only the surface crack direction but also the crack inclination into the Specimen.Copyright © 2003 by ASME

  • Multiaxial Creep-Fatigue Using Cruciform Specimen at High Temperature.
    Journal of The Society of Materials Science Japan, 1997
    Co-Authors: Shoichi Mukai, Masateru Ohnami, Masao Sakane, Takashi Ogata
    Abstract:

    This paper describes the creep-fatigue damage evaluation of SUS 304 stainless steel in wide ranges of multiaxial stress and strain states. Low cycle fatigue and creep-fatigue tests were carried out using a Cruciform Specimen in a full range of strain biaxiality including equi-biaxial tension/compression at 823K and 873K. Mises' equivalent strain, maximum principal strain, the equivalent strain based on crack opening displacement (COD) and Γ*-parameter were applied to the experimental low cycle fatigue data. The latter two strain parameters gave a better correlation than the former two strain parameters. The discussion on the correlation of the biaxial creep rupture data was briefly made and the equivalent stress based on COD was the most suitable stress parameter correlating the biaxial creep rupture data. Creep-fatigue damage was evaluated based on the equivalent strain and stress based on COD. The creep-fatigue damage evaluated fell around a line of unity in value, which indicates that the linear damage rule holds in the biaxial creep-fatigue.

Shinji Ogihara - One of the best experts on this subject based on the ideXlab platform.

  • comparison of glass epoxy interface strengths examined by Cruciform Specimen and single fiber pull out tests under combined stress state
    Composites Part A-applied Science and Manufacturing, 2012
    Co-Authors: Jun Koyanagi, Hayato Nakatani, Shinji Ogihara
    Abstract:

    Abstract A Cruciform Specimen test and a single-fiber pull-out test are used to examine two glass–epoxy interface-failure envelopes under a combined stress state. A single fiber embedded in various off-axis directions for the Cruciform Specimen test creates various combined stress states. Finite-element analysis considering an inelastic constitutive equation of matrix resin and thermal residual stress is implemented for both tests. For the single-fiber pull-out test, a resin cone serving as the fiber entrance part, called the resin meniscus in this study, is modeled in finite-element analysis. This enables more precise calculation of interface stress around the interface failure point than calculations not considering the resin meniscus. The interface failure strengths obtained using the Cruciform Specimen and single-fiber pull-out tests show good agreement for both interfaces.

  • temperature dependence of glass fiber epoxy interface normal strength examined by a Cruciform Specimen method
    Composites Part B-engineering, 2011
    Co-Authors: Jun Koyanagi, Shinji Ogihara
    Abstract:

    This study evaluates the temperature dependence of interfacial normal strength using a Cruciform Specimen method. The Specimen consists of a glass fiber monofilament embedded transversely in an epoxy matrix that is Cruciform in shape. The Specimen is cured at either room temperature or at 100 °C. The Cruciform test is conducted under various test temperatures using a fabricated micro-mechanical testing system equipped with a heating system to control the test temperatures. A finite-element analysis is performed to obtain the interfacial normal stress considering the thermal residual stress which varies with the test temperature. The results suggest that the interfacial normal strength does not decrease with temperature whereas the matrix strength does.

  • investigation of the interfacial failure criterion at glass fiber epoxy matrix by the Cruciform Specimen method considering the debonding initiation location
    Journal of the Japan Society for Composite Materials, 2011
    Co-Authors: Akihiro Kashima, Jun Koyanagi, Shinji Ogihara
    Abstract:

    This paper evaluates interfacial failure criterion under combined stress state and precise location along the fiber circumference of interfacial failure (debonding) initiation at glass fiber fiber/epoxy interface by the Cruciform Specimen method. The effects of both thermal residual stress occurred during Specimen preparation and inelastic stress-strain constitutive relationship of matrix resin on the evaluation of interfacial failure criterion are considered. The interfacial stresses distribute along with fiber circumference. In this study, the location of interfacial failure initiation is specified and the interfacial failure criterion is evaluated. By changing the Cruciform arm angle (the angle between the fiber and the loading directions), various combined stress states are obtained which make it possible to evaluate the interfacial failure criterion. Both the quadratic and parabolic criteria are assumed and discussed.

  • investigation of combined stress state failure criterion for glass fiber epoxy interface by the Cruciform Specimen method
    Composites Science and Technology, 2010
    Co-Authors: Shinji Ogihara, Jun Koyanagi
    Abstract:

    The interfacial failure criterion under combined stress state in a glass fiber/epoxy composite is investigated by the Cruciform Specimen method. Experiments were conducted by using Specimens with a fiber whose angle from the loading direction is varied in order to make various stress state of normal and shear at the interface. Finite element analysis is performed to calculate the interfacial stress distribution. By combining the experimental measurement of the Specimen stress at the interfacial debonding initiation and the finite element stress analysis, it is possible to obtain the interfacial stress state at interfacial failure. A method to determine the interfacial failure criterion and the interfacial failure initiation location simultaneously is proposed in the present study. We conclude the value of the interfacial shear strength is higher than that of the interfacial normal strength for the material system used in the present study.

  • determination of interfacial failure criterion in glass fiber epoxy interface by Cruciform Specimen method employing elasto plastic analysis
    Proceedings of SPIE the International Society for Optical Engineering, 2009
    Co-Authors: Jun Koyanagi, Shinji Ogihara
    Abstract:

    This study aims obtain a precise strength of a glass fiber/ epoxy resin interface by taking non-elastic analysis which might be very important factor to be considered. A Cruciform Specimen method is one of the reasonable tests to investigate interfacial strength. Varying the Cruciform angles, the interfacial failure criterion under combined stress-state can be obtained. However, when the interfacial strength is beyond the matrix yield stress, non-elastic stress analysis must be done in order to obtain the interfacial strength precisely. In this study, the non-elastic analysis is performed and the effect is discussed.

Jun Koyanagi - One of the best experts on this subject based on the ideXlab platform.

  • comparison of glass epoxy interface strengths examined by Cruciform Specimen and single fiber pull out tests under combined stress state
    Composites Part A-applied Science and Manufacturing, 2012
    Co-Authors: Jun Koyanagi, Hayato Nakatani, Shinji Ogihara
    Abstract:

    Abstract A Cruciform Specimen test and a single-fiber pull-out test are used to examine two glass–epoxy interface-failure envelopes under a combined stress state. A single fiber embedded in various off-axis directions for the Cruciform Specimen test creates various combined stress states. Finite-element analysis considering an inelastic constitutive equation of matrix resin and thermal residual stress is implemented for both tests. For the single-fiber pull-out test, a resin cone serving as the fiber entrance part, called the resin meniscus in this study, is modeled in finite-element analysis. This enables more precise calculation of interface stress around the interface failure point than calculations not considering the resin meniscus. The interface failure strengths obtained using the Cruciform Specimen and single-fiber pull-out tests show good agreement for both interfaces.

  • temperature dependence of glass fiber epoxy interface normal strength examined by a Cruciform Specimen method
    Composites Part B-engineering, 2011
    Co-Authors: Jun Koyanagi, Shinji Ogihara
    Abstract:

    This study evaluates the temperature dependence of interfacial normal strength using a Cruciform Specimen method. The Specimen consists of a glass fiber monofilament embedded transversely in an epoxy matrix that is Cruciform in shape. The Specimen is cured at either room temperature or at 100 °C. The Cruciform test is conducted under various test temperatures using a fabricated micro-mechanical testing system equipped with a heating system to control the test temperatures. A finite-element analysis is performed to obtain the interfacial normal stress considering the thermal residual stress which varies with the test temperature. The results suggest that the interfacial normal strength does not decrease with temperature whereas the matrix strength does.

  • investigation of the interfacial failure criterion at glass fiber epoxy matrix by the Cruciform Specimen method considering the debonding initiation location
    Journal of the Japan Society for Composite Materials, 2011
    Co-Authors: Akihiro Kashima, Jun Koyanagi, Shinji Ogihara
    Abstract:

    This paper evaluates interfacial failure criterion under combined stress state and precise location along the fiber circumference of interfacial failure (debonding) initiation at glass fiber fiber/epoxy interface by the Cruciform Specimen method. The effects of both thermal residual stress occurred during Specimen preparation and inelastic stress-strain constitutive relationship of matrix resin on the evaluation of interfacial failure criterion are considered. The interfacial stresses distribute along with fiber circumference. In this study, the location of interfacial failure initiation is specified and the interfacial failure criterion is evaluated. By changing the Cruciform arm angle (the angle between the fiber and the loading directions), various combined stress states are obtained which make it possible to evaluate the interfacial failure criterion. Both the quadratic and parabolic criteria are assumed and discussed.

  • investigation of combined stress state failure criterion for glass fiber epoxy interface by the Cruciform Specimen method
    Composites Science and Technology, 2010
    Co-Authors: Shinji Ogihara, Jun Koyanagi
    Abstract:

    The interfacial failure criterion under combined stress state in a glass fiber/epoxy composite is investigated by the Cruciform Specimen method. Experiments were conducted by using Specimens with a fiber whose angle from the loading direction is varied in order to make various stress state of normal and shear at the interface. Finite element analysis is performed to calculate the interfacial stress distribution. By combining the experimental measurement of the Specimen stress at the interfacial debonding initiation and the finite element stress analysis, it is possible to obtain the interfacial stress state at interfacial failure. A method to determine the interfacial failure criterion and the interfacial failure initiation location simultaneously is proposed in the present study. We conclude the value of the interfacial shear strength is higher than that of the interfacial normal strength for the material system used in the present study.

  • determination of interfacial failure criterion in glass fiber epoxy interface by Cruciform Specimen method employing elasto plastic analysis
    Proceedings of SPIE the International Society for Optical Engineering, 2009
    Co-Authors: Jun Koyanagi, Shinji Ogihara
    Abstract:

    This study aims obtain a precise strength of a glass fiber/ epoxy resin interface by taking non-elastic analysis which might be very important factor to be considered. A Cruciform Specimen method is one of the reasonable tests to investigate interfacial strength. Varying the Cruciform angles, the interfacial failure criterion under combined stress-state can be obtained. However, when the interfacial strength is beyond the matrix yield stress, non-elastic stress analysis must be done in order to obtain the interfacial strength precisely. In this study, the non-elastic analysis is performed and the effect is discussed.

Shengde Zhang - One of the best experts on this subject based on the ideXlab platform.

  • multiaxial creep fatigue life prediction for Cruciform Specimen
    International Journal of Fatigue, 2007
    Co-Authors: Shengde Zhang, Masao Sakane
    Abstract:

    Abstract This paper describes the high temperature multiaxial creep–fatigue life prediction for type 304 stainless steel. Finite element analyses were performed for determining the stress–strain state in the gage part of a Cruciform Specimen subjected to creep–fatigue loading under four strain waves at three principal strain ratios. Creep–fatigue lives of Cruciform Specimens were discussed in relation to the principal stress amplitude calculated by finite element analysis. Creep–fatigue damage was evaluated by linear damage rule and the suitability of three low cycle fatigue and three creep damage parameters was discussed.

  • Multiaxial creep-fatigue life using Cruciform Specimen
    International Journal of Fatigue, 2007
    Co-Authors: Shengde Zhang, Kunimasa Ozaki, Masaya Harada, Masao Sakane
    Abstract:

    Abstract This paper studies the multiaxial creep–fatigue life for type 304 stainless steel at elevated temperature. Strain controlled biaxial tension–compression creep–fatigue tests were carried out using Cruciform Specimens under four strain waves at three principal strain ratios. The strain wave and the principal strain ratio had a significant effect on creep–fatigue life of the Cruciform Specimen. The creep–fatigue life ratio decreased as the principal strain ratio increased which indicates that larger creep damage occurred at larger principal strain ratio. The effects of the strain wave and principal strain ratio were discussed in relation to the observations of surface crack and void area density in the gage part of the Specimen.

Masateru Ohnami - One of the best experts on this subject based on the ideXlab platform.

  • Multiaxial Creep-Fatigue Using Cruciform Specimen at High Temperature.
    Journal of The Society of Materials Science Japan, 1997
    Co-Authors: Shoichi Mukai, Masateru Ohnami, Masao Sakane, Takashi Ogata
    Abstract:

    This paper describes the creep-fatigue damage evaluation of SUS 304 stainless steel in wide ranges of multiaxial stress and strain states. Low cycle fatigue and creep-fatigue tests were carried out using a Cruciform Specimen in a full range of strain biaxiality including equi-biaxial tension/compression at 823K and 873K. Mises' equivalent strain, maximum principal strain, the equivalent strain based on crack opening displacement (COD) and Γ*-parameter were applied to the experimental low cycle fatigue data. The latter two strain parameters gave a better correlation than the former two strain parameters. The discussion on the correlation of the biaxial creep rupture data was briefly made and the equivalent stress based on COD was the most suitable stress parameter correlating the biaxial creep rupture data. Creep-fatigue damage was evaluated based on the equivalent strain and stress based on COD. The creep-fatigue damage evaluated fell around a line of unity in value, which indicates that the linear damage rule holds in the biaxial creep-fatigue.

  • development of multiaxial creep testing machine using Cruciform Specimen
    Journal of The Society of Materials Science Japan, 1996
    Co-Authors: Shoichi Mukai, Masateru Ohnami, Masao Sakane, Toshiyuki Takada, Takafumi Tsurui
    Abstract:

    This paper describes the development of multiaxial creep testing machine using Cruciform Specimens in a wide range of biaxial stress conditions of 0≤λ≤1 and the multiaxial creep rupture tests at 923K, where λ denotes the ratio of the minimum principal stress to the maximum principal stress. The developed test machine has a loading capacity of 98KN and the maximum temperature is 923K. Three dimensional finite element (FE) creep analyses were made to determine the shape and dimensions of the Cruciform Specimen having uniform stress distribution along the gage length. The Specimen shape determined by the FE analyses has a 32mm×32mm parallel part with 5mm thickness. In the biaxial Mises' stress constant creep tests using type 304 stainless steel Cruciform Specimens, creep rupture time increased with increasing λ, so that the biaxial stress has an effect on rupture time. The rupture data did not depend on λ when correlated with the equivalent stress based on crack opening displacement, but they depended on λ with Huddleston's stress. Huddleston's stress gave more conservative equi-biaxial tension creep rupture time than the Mises' stress. The Mises' equivalent strain rate decreased with increasing λ in multiaxial creep tests.

  • fracture plane of Cruciform Specimen in biaxial low cycle fatigue estimate by variance method and experimental verification
    Journal of Engineering Materials and Technology-transactions of The Asme, 1995
    Co-Authors: W Bedkowski, Masateru Ohnami, E Macha, Masao Sakane
    Abstract:

    This paper presents the variance method of determining the fracture plane under random multiaxial stress states. The fracture plane was estimated analytically by the variance method with the three fatigue criteria. The estimated fracture planes were compared with experimental result using type SUS 304 and 1Cr-1Mo-1/4V steel Cruciform Specimens. The variance method with the maximum normal strain criterion, by neglecting the strain in direction in which no external forces act, could estimate the actual fracture planes of Cruciform Specimens in high temperature biaxial low cycle fatigue

  • High Temperature Multiaxial Low Cycle Fatigue of Cruciform Specimen
    Journal of Engineering Materials and Technology-transactions of The Asme, 1994
    Co-Authors: Masao Sakane, Masateru Ohnami
    Abstract:

    This paper describes high temperature multiaxial low cycle fatigue lives of type SUS304 stainless steel and 1Cr-1Mo-1/4V steel Cruciform Specimens at 923 K and 823 K in air. Strain controlled multiaxial low cycle fatigue tests were carried out using Cruciform Specimens at the principal strain ratios between [minus]1 and 1. The principal strain ratio had a significant effect on low cycle fatigue lives. Fatigue lives drastically decreased as the principal strain ratio increased. Multiaxial low cycle fatigue strain parameters were applied to the experimental data and the applicability of the parameter was discussed. The equivalent strain based on crack opening displacement (COD strain) developed in the paper and [Gamma][sup *] -- plane parameter successfully predicted multiaxial low cycle fatigue lives. The crack morphology was also extensively discussed from not only the surface crack direction but also the crack inclination into the Specimen.

  • HIGH TEMPERATURE MULTIAXIAL LOW CYCLE FATIGUE USING Cruciform Specimen
    Mechanical Behaviour of Materials VI, 1992
    Co-Authors: Masao Sakane, Masateru Ohnami
    Abstract:

    ABSTRACT This paper describes the high temperature multiaxial low cycle fatigue of type 304 stainless and 1Cr-1Mo-1/4V Cruciform Specimens at 823K and 923K in air. Strain controlled multiaxial low cycle fatigue tests were carried out at the principal strain ratios between -1 and 1. The principal strain ratio had a significant effect on low cycle fatigue lives. Fatigue lives drastically decreased as the principal strain ratio increased. Several multiaxial low cycle fatigue strain parameters were applied to the experimental data and the applicability of the parameters was discussed.