Macro versus micro-scale constitutive models in simulating proportional and nonproportional cyclic and ratcheting responses of stainless steel 304

An evaluation for several kinematic hardening rules on prediction of multiaxial stress-controlled ratchetting

“…On the other hand, Kang (2004) have examined the effects of different loading paths and parameters on non-proportional ratchetting responses. Hassan and his co-workers (Hassan et al, 2008;Krishna et al, 2009) have explored further the influence of non-proportionality of stress-controlled paths on ratchetting response of stainless steel (SS) 304L. In fact, Aubin et al (2003) and Kang and his co-workers (Kang, 2004;Kang et al, 2006a,b) used some classical non-linear hardening rules to simulate these experiments.…”

Biaxial ratchetting with novel variations of kinematic hardening

“…3. Clearly many other proposed features of kinematic hardening, such as strain-range dependent hardening/softening based on evolving surfaces in strain space and the introduction of non-proportionality factors, whose various descriptions can be found in past and recent review articles by Ohno (1997), Kang (2008), Chaboche (2008) and Krishna et al (2009), can be incorporated in the model, if desired. Similarly the recently developed constitutive feature of directional distortional hardening by Dafalias (2007, 2008) can be superposed to the proposed model for better simulation of ratchetting.…”

More on Fatigue Verification of Class 1 Nuclear Power Piping According to ASME BPV Code

“…It has been, however, shown in recent reports by Rahman et al [16], Hassan et al [17] and Krishna et al [18] that such non-linear finite element analyses can only provide a reasonable modeling of plastic shakedown phenomena after a few initial load cycles. For continuous ratcheting responses, such analyses cannot provide reasonable results, neither for the accumulated local strain nor for the global dimension change.…”