Strain-path dependent hardening models with rigorously identical predictions under monotonic loading

Yang, Yanfeng; Vincze, Gabriela; Baudouin, Christophe; Chalal, Hocine; Balan, Tudor

doi:10.1016/j.mechrescom.2020.103615

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…Moreover, in all BUT simulations, the friction effect is neglected because of the application of lubricant and the use of a free roller in the experiments. The von Mises plasticity function is used in all BUT simulation because Yang et al [40] confirmed the weak anisotropy of the investigated material, and given its negligible influence on the experimental springback results.…”

Section: Numerical Simulation Of But Testsmentioning

confidence: 99%

Prediction of springback after bending under tension

et al. 2022

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The effect of kinematic hardening on springback predictions in sheet metals was rigorously clarified using a modular bending-under-tension test. DP600 sheet samples were tested over a wide range of tool radii and tension forces. Specifically modified isotropic hardening and combined isotropickinematic hardening models were compared, which provide strictly identical predictions under monotonic loading. Loading configurations (combinations of tool radius and sheet tension) were identified which require the use of one or the other type of hardening model, in order to ensure the predictive accuracy. The two models predicted similar springback for high backforces or for high R/t ratios. In turn, both models failed to predict the springback accurately for small R/t ratios, in particular when combined with small backforces. This combination of loading conditions appeared as the most discriminant one, in which the combined hardening model clearly appears qualitatively superior although not entirely sufficient, designating the potential application areas for more advanced material models.

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Section: Numerical Simulation Of But Testsmentioning

confidence: 99%

Prediction of springback after bending under tension

et al. 2022

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“…Thus, deriving the rate of 𝜎𝜎 * appears as a trivial extension of any arbitrary hardening model, while its analytical integration under an algebraic form may be difficult of impossible. The full development of the corresponding equations for the TH model can be found in [10].…”

Section: Experiments Modelmentioning

confidence: 99%

Parameter Identification and Modeling of Hardening to Preserve Identical Predictions under Monotonic Loading

Yang

Vincze

Baudouin

et al. 2022

KEM

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Advanced hardening models accurately describe the transient plastic behavior (reyielding, stagnation, resumption...) after various strain-path changes (reverse, orthogonal...). However, a common drawback of these models is that they usually predict monotonic loading with lower accuracy than the regular isotropic hardening models. Consequently, the finite element predictions using these models may sometimes lose in accuracy, in spite of their tremendous theoretical superiority. This drawback has been eliminated in the literature for the Chaboche isotropic-kinematic hardening model. In this work, a generic approach is proposed for advanced hardening models. Arbitrary models could be successfully compensated to preserve rigorously identical predictions under monotonic loading. A physically-based model involving a 4th order tensor and two 2nd order tensors was used for the demonstration. The parameter identification procedure was greatly simplified by rigorously decoupling the identification of isotropic hardening parameters from the other parameters.

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