A unified material model for multiaxial ductile fracture and extremely low cycle fatigue of Inconel 718

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

“…The mathematical formulation of the well‐known Chaboche's model is summarized in Table . The Voce IH rule, which does not account strain memory effect, is considered in this study as it is focused on the behaviour of CS materials only. Analysis of cyclic‐plastic behaviour of a material examined using CIKH model considering four nonlinear backstress components demands the determination of 11 cyclic‐plastic parameters in accordance with Equations and .…”

“…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.…”

“…Simulation of cyclic‐plastic behaviour of materials is typically done by using the combined isotropic‐kinematic hardening models . The growth (or shrinkage) of the yield surface due to cyclic hardening (or softening) phenomenon is generally simulated using isotropic hardening (IH) models, while the accumulation of plastic strains with cycle or ratcheting phenomenon is modeled by considering kinematic hardening (KH) models, related to the shift of the yield surface.…”

Evaluation of the horizontal load-carrying capacity of a thin steel bridge pier by means of the Damage Subloading Surface model

“…Recent works of Bai and Wierzbicki [19] and Algarni et al [20,21] implements a modified Mohr-Coulomb (M-C) criterion for the ductile fracture. This failure criterion has been extensively used for the description of porous media, such as rocks and soils, however, its ability to consider the stress triaxiality η and Lode angle parameter θ effects makes it suitable for the description of metallic materials too.…”

“…This leads to a smaller absorbed energy per cycle due to the material softening and therefore to an overestimation of the number of cycles to reach the critical energy. Moreover, the ductile damage accumulation law should be also provided with a term that takes into account the non-proportionality of the load, since it has been shown that this factor affects the ductility of metals [20,28]. On the other hand, the criteria can provide, in first approximation, a valid tool to judge the seismic performance of steel bridge columns under unidirectional seismic loading.…”