The Experts below are selected from a list of 16911 Experts worldwide ranked by ideXlab platform
Masao Sakane - One of the best experts on this subject based on the ideXlab platform.
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n a l Low Cycle Fatigue -Experiment and FEM Analysis - Tomoshige SUSAKI
2020Co-Authors: Masao Sakane, Graduate Student, Tsuneo Itoh, Yoshiyasu KawazoeAbstract:ABSTRACT This paper studies the Low Cycle Fatigue of circumferential notched specimens of type 304 stainless steel in nonproportional loading. Strain controlled tension-torsion Low Cycle Fatigue tests were carried out using the notched specimens under 15 strain paths. Crack initiation lives detected by a d.c. potential method were discussed in relation to the strain concentration factors and strain histories. Finite element analyses were carried out for evaluating the local strain at the notch root using elastic-perfectly plastic and bi-linear models. The maximum principal strain and nonproportional strain ranges conservatively estimated the crack initiation lives of the notched specimens
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multiaxial Low Cycle Fatigue life under non proportional loading
International Journal of Pressure Vessels and Piping, 2013Co-Authors: Takamoto Itoh, Masao Sakane, Kazuki OhsugaAbstract:Abstract A simple and clear method of evaluating stress and strain ranges under non-proportional multiaxial loading where principal directions of stress and strain are changed during a Cycle is needed for assessing multiaxial Fatigue. This paper proposes a simple method of determining the principal stress and strain ranges and the severity of non-proportional loading with defining the rotation angles of the maximum principal stress and strain in a three dimensional stress and strain space. This study also discusses properties of multiaxial Low Cycle Fatigue lives for various materials Fatigued under non-proportional loadings and shows an applicability of a parameter proposed by author for multiaxial Low Cycle Fatigue life evaluation.
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Effect of additive elements on tensile, creep and Low Cycle Fatigue strength for SnBi solders
2012 14th International Conference on Electronic Materials and Packaging (EMAP), 2012Co-Authors: Sho Nakano, Hiroaki Hokazono, Masao Sakane, Mitsuo YamashitaAbstract:This paper presents tensile, creep and Low Cycle Fatigue properties of three kinds of SnBi lead-free solders. Tensile, creep and Low Cycle Fatigue tests were performed using miniature specimens of the three solders. The effects of additive elements on tensile, creep and Fatigue properties were discussed. Three kinds of solders showed almost the same tensile strength of around 55MPa and the same tensile ductility of about 70%. The creep rupture lifetimes of Sn57.5Bi0.5AgCuNiGe were about 1.5 - 2 times longer than those of Sn58Bi and Sn57.5Bi0.5Ag solders at 313K, 353K and 373K. The three kinds of solders showed almost the same Low Cycle Fatigue strength at 313K. These mechanical properties were discussed in relation with the microstructure.
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Notch effect on multiaxial Low Cycle Fatigue
International Journal of Fatigue, 2011Co-Authors: Masao Sakane, Shengde ZhangAbstract:Abstract This paper discusses the notch effect on multiaxial Low Cycle Fatigue. Neuber’s rule was firstly introduced to estimate local strains at the notch root in proportional tension and torsion loading. The Neuber’s rule was applied to estimate crack initiation and propagation lives in tension–torsion Low Cycle Fatigue. The rule conservatively estimated the crack initiation life in tension Low Cycle Fatigue and appropriately in torsion Low Cycle Fatigue. A simple method for estimating the local strain at the notch root was proposed in tension and torsion loading. The notch effect in nonproportional Low Cycle Fatigue was discussed in two materials. The local strain at the notch root obtained by finite element analysis underestimated the crack initiation lives for the additional hardening material but that obtained by the Neuber’s rule overestimated for the non-additional hardening material.
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a design procedure for assessing Low Cycle Fatigue life under proportional and non proportional loading
International Journal of Fatigue, 2006Co-Authors: Takamoto Itoh, Masao Sakane, Takahiro Hata, Naomi HamadaAbstract:This paper discusses the design assessment for structural components subjected to proportional and non-proportional loading. Multiaxial Low Cycle Fatigue lives are influenced by stress and strain multiaxiality, their non-proportionality and a material property that relates to the degree of additional hardening. Many Low Cycle Fatigue studies under proportional and non-proportional loading were carried out in laboratories, but a little study discussed the application of the results obtained in laboratories to an actual design for structural components. This paper proposes a Fatigue life assessment for structural components subjected to proportional and non-proportional Low Cycle Fatigue loading. The assessment provides a simple method for evaluating principal strain range, strain multiaxiality and strain non-proportionality. This paper also discusses Low Cycle Fatigue parameters suitable for the life assessment of structural components subjected to multiaxial loading.
Takamoto Itoh - One of the best experts on this subject based on the ideXlab platform.
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analysis of multiaxial Low Cycle Fatigue of notched specimens for type 316l stainless steel under non proportional loading
Theoretical and Applied Fracture Mechanics, 2017Co-Authors: Pasquale Gallo, Takahiro Morishita, Takamoto Itoh, Stefano Bressan, Filippo BertoAbstract:Abstract The paper analyzes multiaxial Low Cycle Fatigue tests of notched specimens under proportional and non-proportional loading conditions. Strain controlled multiaxial Low Cycle Fatigue tests were carried out using circumferentially notched round-bar specimens of type 316L stainless steel, with different stress concentration factors. The experimental results show that the crack initiation site is shifted from the notch tip. Based on this finding, a new model for life evaluation is proposed by taking into account the strain gradient in the proximity of the notch tip and the effective maximum strain range. The new model alLows evaluating the Fatigue life in a narrow scatter band.
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multiaxial Low Cycle Fatigue life under non proportional loading
International Journal of Pressure Vessels and Piping, 2013Co-Authors: Takamoto Itoh, Masao Sakane, Kazuki OhsugaAbstract:Abstract A simple and clear method of evaluating stress and strain ranges under non-proportional multiaxial loading where principal directions of stress and strain are changed during a Cycle is needed for assessing multiaxial Fatigue. This paper proposes a simple method of determining the principal stress and strain ranges and the severity of non-proportional loading with defining the rotation angles of the maximum principal stress and strain in a three dimensional stress and strain space. This study also discusses properties of multiaxial Low Cycle Fatigue lives for various materials Fatigued under non-proportional loadings and shows an applicability of a parameter proposed by author for multiaxial Low Cycle Fatigue life evaluation.
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material dependence of multiaxial Low Cycle Fatigue lives under non proportional loading
International Journal of Fatigue, 2011Co-Authors: Takamoto Itoh, Tao YangAbstract:This study discusses evaluation of material dependence of multiaxial Low Cycle Fatigue to develop a suitable strain parameter for life estimation under non-proportional loading. It has been reported that Fatigue lives are reduced accompanying an additional hardening under strain controlled non-proportional loading in which principal directions of stress and strain are changed in a Cycle. Strain controlled multiaxial Low Cycle Fatigue tests under proportional and non-proportional strain paths were carried out using holLow cylinder specimens of several materials. The reduction in Low Cycle Fatigue life due to non-proportional loading is discussed relating to the additional cyclic hardening behaviors and its material dependence. Material constant, α, used in strain parameter for life estimation under non-proportional multiaxial Low Cycle Fatigue is also discussed.
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material dependence of multiaxial Low Cycle Fatigue properties under non proportional loading
Journal of The Society of Materials Science Japan, 2007Co-Authors: Takamoto Itoh, Katsutoshi Murashima, Takanori HiraiAbstract:This study describes the evaluation of material dependence of multiaxial Low Cycle Fatigue to develop a suitable strain parameter for life prediction under non-proportional loading. Strain controlled multiaxial Low Cycle Fatigue tests using 4 types of proportional and non-proportional strain histories were carried out on SUS316NG and SGV410 holLow cylinder specimens at room temperature. The reduction of Low Cycle Fatigue life due to non-proportional loading was discussed relating to an additional hardening and crack initiation and propagation behaviors, and the applicability of the nonproportional strain proposed by the authors was also discussed. Fatigue lives decreased down to 1/5 by the non-proportional loading depending on strain history for SUS316NG and SGV410 steels, whereas the degree of additional hardening was different, which suggested that another factor like difference of crystal structure should be taken into account for the life prediction under non-proportional loading.
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a design procedure for assessing Low Cycle Fatigue life under proportional and non proportional loading
International Journal of Fatigue, 2006Co-Authors: Takamoto Itoh, Masao Sakane, Takahiro Hata, Naomi HamadaAbstract:This paper discusses the design assessment for structural components subjected to proportional and non-proportional loading. Multiaxial Low Cycle Fatigue lives are influenced by stress and strain multiaxiality, their non-proportionality and a material property that relates to the degree of additional hardening. Many Low Cycle Fatigue studies under proportional and non-proportional loading were carried out in laboratories, but a little study discussed the application of the results obtained in laboratories to an actual design for structural components. This paper proposes a Fatigue life assessment for structural components subjected to proportional and non-proportional Low Cycle Fatigue loading. The assessment provides a simple method for evaluating principal strain range, strain multiaxiality and strain non-proportionality. This paper also discusses Low Cycle Fatigue parameters suitable for the life assessment of structural components subjected to multiaxial loading.
Tao Yang - One of the best experts on this subject based on the ideXlab platform.
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material dependence of multiaxial Low Cycle Fatigue lives under non proportional loading
International Journal of Fatigue, 2011Co-Authors: Takamoto Itoh, Tao YangAbstract:This study discusses evaluation of material dependence of multiaxial Low Cycle Fatigue to develop a suitable strain parameter for life estimation under non-proportional loading. It has been reported that Fatigue lives are reduced accompanying an additional hardening under strain controlled non-proportional loading in which principal directions of stress and strain are changed in a Cycle. Strain controlled multiaxial Low Cycle Fatigue tests under proportional and non-proportional strain paths were carried out using holLow cylinder specimens of several materials. The reduction in Low Cycle Fatigue life due to non-proportional loading is discussed relating to the additional cyclic hardening behaviors and its material dependence. Material constant, α, used in strain parameter for life estimation under non-proportional multiaxial Low Cycle Fatigue is also discussed.
Liqiang Liu - One of the best experts on this subject based on the ideXlab platform.
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Low Cycle Fatigue life prediction model of 800h alloy based on the total strain energy density method
Materials, 2019Co-Authors: Wei Zhang, Tao Jiang, Liqiang LiuAbstract:In this paper, a high-temperature Low-Cycle Fatigue life prediction model, based on the total strain energy density method, was established. Considering the influence of the Masing and non-Masing behavior of materials on life prediction, a new life prediction model was obtained by modifying the existing prediction model. With an 800H alloy of the heat transfer tube of a steam generator as the research object, the high-temperature and Low-Cycle Fatigue test was carried out at two temperatures. The results show that the predicted and experimental results are in good agreement, proving the validity of the life prediction model.
Rongqiao Wang - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of Fatigue crack growth behavior of GH2036 under combined high and Low Cycle Fatigue
International Journal of Fatigue, 2016Co-Authors: Fanchao Meng, Huawei Liu, Jun Song, Rongqiao WangAbstract:Fatigue crack growth rates have been experimentally determined for the superalloy GH2036 (in Chinese series) at an elevated temperature of 550°C under pure Low Cycle Fatigue (LCF) and combined high and Low Cycle Fatigue (CCF) loading conditions by establishing a CCF test rig and using corner-notched specimens. These studies reveal decelerated crack growth rates under CCF loading compared to pure LCF loading, and crack propagation accelerates as the dwell time prolongs. Then the mechanism of Fatigue crack growth at different loadings has been discussed by using scanning electron microscope (SEM) analyses of the fracture surface.
