Fatigue life estimation in presence of ratcheting phenomenon for AISI 304LN stainless steel tested under uniaxial cyclic loading

In this paper, a continuum damage mechanics model is incorporated into the finite element model which contains a spherical inclusion to investigate damage evolution and predict fatigue life of M50-bearing steel. Quasi-dynamic method, isothermal elastohydrodynamic lubrication analysis and non-Gaussian surface simulating technique are combined to obtain the contact pressure. The damage evolution process of the micro-domain considering roughness texture is simulated and the fatigue life is predicted. The result shows that transverse texture can weaken the damage accumulation due to the strengthening of hydrodynamic effect. The effects of surface roughness parameters on fatigue life are also analyzed. It should be noted that transverse texture, small mean square root value and kurtosis, negative skewness are helpful for enhancing the fatigue life of bearing steel. Meanwhile, the increase of frictional coefficient and radius, negative position of local region will reduce the fatigue life.

Section: Modeling Strategymentioning

confidence: 99%

Influence of rough surface on damage evolution and fatigue life of M50-bearing steel containing a spherical inclusion

Guan

Wang

et al. 2019

“…But the influence of fatigue damage on the ratcheting response was neglected, so that it could not provide reasonable prediction for the whole-life ratcheting response. For 304LN stainless steel, the ratcheting–fatigue interaction was reasonably estimated with a mean stress-based model (Mishra etal., 2015). The damage bounds and weight factor were introduced to reflect the ratcheting–fatigue interaction for 42CrMo and 1025 steel, which agreed well with the experimental data (Varvani-Farahani, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Based on the damage mechanism, many other researchers developed different kinds of theoretical models to predict the fatigue damage or the ratcheting–fatigue interaction for metals (Guo etal., 2020; Kumar etal., 2019; Mishra etal., 2015; Ren etal., 2018; Si-Jian etal., 2017; Xie etal., 2019; Zhou etal., 2017). It was noted that among different materials (Pun etal., 2014) or under different loading conditions (Zuo etal., 2014), the ratcheting–fatigue interaction and fatigue damage could be different.…”

Section: Introductionmentioning

confidence: 99%

Damage-coupled ratcheting behaviors of SA508 Gr.3 steel at room and elevated temperatures: Experiments and simulations

Tian

Shao

et al. 2020

A series of experiments subjected to uniaxial and non-proportionally multiaxial cyclic loadings were performed to investigate the ratcheting responses of SA508 Gr.3 steel at room and elevated temperatures. The influences of different stress levels and nonproportional loading paths on the damage-coupled ratcheting responses were discussed. From experimental results, cyclic softening characteristic and dynamic strain aging can be observed under cyclic loadings. Moreover, the steel exhibits an obvious nonproportional path-dependence of the damage evolution under multiaxial loading paths. To numerically simulate the ratcheting responses under uniaxial and multiaxial loadings with the extended cyclic plastic model, the damage-coupled variable was introduced into the classic isotropic and nonlinear kinematic hardening rules. Corresponding material parameters could be calibrated from experimental data, and comparisons between experimental and simulated results were performed to validate the proposed model.

“…Plenty of fatigue criteria have been derived, which can be subdivided into three major categories: stress-, strain- and energy-based approaches (Cristofori et al., 2008; Crossland, 1956; Fatemi and Socie, 1988; Findley, 1957; Gasiak and Pawliczek, 2003; Kluger et al, 2014; Liang and Chen, 2016; Liu and Yan, 2018ab; Marin, 1956; Mcdiarmid, 1994; Mishra et al., 2016; Papadopoulos, 2001; Shang and Wang, 1998; Shen and Akanda, 2016; Sines, 1961; Susmel and Lazzarin, 2002; Zghal et al., 2016; Zhan et al., 2016; Zhang et al., 2018; Zhu et al., 2016, 2017). From a different perspective, they can also be classified as the critical plane approaches and the stress invariant-based approaches.…”

Section: Introductionmentioning

confidence: 99%

A new model of multiaxial fatigue life prediction with the influence of different mean stresses

Liu

Yan

2019

In this paper, based on the thought of Modified Wöhler Curve Method (MWCM), a new general model for predicting multiaxial fatigue life with influence of mean stress is presented. Different from the MWCM, the expressions of multiaxiality effect and mean stress effect are located separately in the proposed fatigue equation, so that the new model can consider the impact of both axial and torsional mean stresses, and the equation form possesses excellent extendibility and variability. The wildly used von Mises equivalent stress is adopted as the fatigue parameter to improve computational efficiency. Finally, in conjunction with the Itoh criterion, the model can be trivially extended to perform non-proportional fatigue prediction with different mean stresses. Some representative fatigue tests published in the previous literature are used to verify this study.