Abstract
AbstractThe principal objective of this work is to model the behavior of a mild steel material from the experimental data using simple and cyclic shear tests on samples taken from different loading directions. The implemented model will use criterial yield functions taking into account equivalent constituents anisotropic coefficients and shape coefficient with, initially, isotropic hardening laws. These functions have been used successfully in proportional loading as simple shear tests. Secondly, the kinematic hardening law is established for complex loading such as cyclic shear tests. For complex testing, two behavior laws (linear kinematic Prager law and nonlinear kinematic Armstrong–Frederick law) are introduced. Then, an identification strategy will be implemented with regard to several hypotheses to identify the parameters of the proposed model. These parameters are determined, with isotropic hardening in simple shear tests and with the combined hardening in cyclic shear tests. From experimental data, a selection is performed to pick out the furthest suitable hardening laws (isotropic law and kinematic law) in order to model the behavior of the mild steel. Finally, a smoothing with experimental hardening shear curves reveals the adequate description of the strong anisotropy of studied material using the plastic behavior model.KeywordsIdentificationShear testsHardening lawsKinematic hardening
Published Version
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