Uniaxial mean stress relaxation of 9–12% Cr steel at high temperature: Experiments and viscoplastic constitutive modeling

Wu, De-Long; Xuan, Fu‐Zhen; Guo, Shuxiang; Zhao, Peng

doi:10.1016/j.ijplas.2015.10.001

Cited by 74 publications

(28 citation statements)

References 62 publications

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“…21 In this regard, the variation of mean stress and stress amplitude vs the cycle number after first cycle of loading at the element of hole edge in the middle plane, which is specified in Figure 9, is described for various cyclic loading conditions in Figure 14. To avoid this issue, it is proposed that the relaxation of the mean stress is assessed instead of the maximum stress.…”

Section: Asymmetrical Stress Cycling Of Cold Expanded Specimensmentioning

confidence: 99%

“…It is proved that softening behavior of materials accelerates the relaxation of mean stress while hardening behavior restrains the rate of mean stress relaxation under similar loading condition. 21 In this regard, the variation of mean stress and stress amplitude vs the cycle number after first cycle of loading at the element of hole edge in the middle plane, which is specified in Figure 9, is described for various cyclic loading conditions in Figure 14. Since the previous experimental and numerical studies 35,44,45 indicate that fatigue cracks initiate from the middle plane at the hole edge for great longitudinal loads, so it is concluded that the middle plane element at the hole edge is the critical location, and this element is selected for analyzing in the following.…”

Section: Asymmetrical Stress Cycling Of Cold Expanded Specimensmentioning

confidence: 99%

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Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

Abdollahi

Chakherlou

2018

Fatigue Fract Eng Mat Struct

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In this paper, the mean stress relaxation behavior of simple Al‐alloy 2024‐T3 specimens and also the mean stress relaxation around the hole of cold expanded specimen are studied. The analyses are performed through the combination of the nonlinear isotropic hardening and Chaboche nonlinear kinematic hardening model accompanied by the results of experimental tests. The strain‐controlled axial tests are performed at two different strain amplitudes, while the stress‐controlled tests of cold expanded specimens are performed for three different imposed load amplitudes. The constitutive equations of the hardening model are coded as a UMAT subroutine in FORTRAN programming language and implemented in the commercial finite element code of ABAQUS. The accuracy of the hardening model has been proved in two steps: first by simulations of mean stress relaxation during the uniaxial strain‐controlled cyclic tests and second by simulation of strain ratcheting during the stress‐controlled cyclic loading. The stress and strain distributions after cold expansion process are examined as well as the mean stress relaxation due to cyclic loading. The results show the influences of imposed stress amplitude on increasing mean stress relaxation and also the effect of cold expansion level on reducing the mean stress relaxation.

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Section: Asymmetrical Stress Cycling Of Cold Expanded Specimensmentioning

confidence: 99%

Section: Asymmetrical Stress Cycling Of Cold Expanded Specimensmentioning

confidence: 99%

Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

Abdollahi

Chakherlou

2018

Fatigue Fract Eng Mat Struct

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“…[41] and Wu et al [42], which was ascribed to different mechanisms of micro-structural changes at various strain amplitudes [42]. In order to compare the SF differences between the WM and BM, the SF curve of WM under the strain amplitude of 0.8% is also plotted in Fig.…”

Section: The Cyclic Plasticity Behavior Of Welded Joint Under Strain-mentioning

confidence: 99%

A comparative study on the cyclic plasticity and fatigue failure behavior of different subzones in CrNiMoV steel welded joint

Guo

Wang

Chen³

et al. 2019

International Journal of Mechanical Sciences

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The cyclic plasticity and the low cycle fatigue failure behavior of the weld metal (WM) and base metal (BM) of the CrNiMoV steel welded joint under the strain and stress-control modes were investigated respectively. Significant cyclic softening was observed for both the WM and BM under the low cycle fatigue tests with the two control modes. Besides, obvious ratcheting happened in the WM and BM under the stress-controlled cyclic loading conditions. It is shown that both the WM and BM exhibited lower fatigue strength at the stress control mode than that at the strain control mode due to the influence of tension-compression asymmetry. Meanwhile, the WM showed larger cyclic softening rate, lower ratchetting deformation and fatigue strength than the BM under the same loading levels. The failure location of the WM specimens shifted from BM region (nearby the heat affected zone) to the center of WM with the increasing of strain amplitude under the strain-controlled tests, which can be explained with the similar maximum equivalent plastic strain amplitude location shifting behavior observed from the corresponding finite element simulations.

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“…The use of conventional and advanced structural materials for various engineering applications demands an understanding of material behaviour under different loading conditions, specifically in the elastic‐plastic regime. Analysis and modelling of engineering components under cyclic loading are complex because cyclic‐plastic phenomena like Bauschinger effect, ratcheting, shakedown, and mean stress relaxation are to be considered in the constitutive modelling. Amongst these phenomena, ratcheting often leads to failure because of the progressive accumulation of plastic strain under asymmetric stress‐controlled cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Prediction of asymmetric cyclic‐plastic behaviour for cyclically stable non‐ferrous materials

Nath

Barai

Ray

2019

Fatigue Fract Eng Mat Struct

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Investigation on asymmetric cyclic‐plastic or ratcheting behaviour of non‐ferrous materials has received relatively little attention compared with ferrous materials. Ratcheting behaviour of materials is generally simulated using isotropic‐kinematic hardening models; however, for materials showing cyclically stable response, isotropic hardening is often not accounted for the constitutive modelling. A methodology based on Chaboche's isotropic‐kinematic hardening (CIKH) model with the consideration of genetic algorithm for optimization of initial estimates of the CIKH parameters is used in this study. The investigated plastic responses incorporate both symmetric strain‐controlled hysteresis loops and ratcheting behaviour. The suggested approach satisfactorily predicts the reported plastic response of cyclically stable non‐ferrous alloys based on aluminum, zirconium, and titanium.

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Uniaxial mean stress relaxation of 9–12% Cr steel at high temperature: Experiments and viscoplastic constitutive modeling

Cited by 74 publications

References 62 publications

Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

A comparative study on the cyclic plasticity and fatigue failure behavior of different subzones in CrNiMoV steel welded joint

Prediction of asymmetric cyclic‐plastic behaviour for cyclically stable non‐ferrous materials

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