Modelling of Strain-Controlled Thermomechanical Fatigue Testing of Cast AlSi7Cu3.5Mg0.15 (Mn, Zr, V) Alloy for Different Aging Conditions

Thermomechanical fatigue loadings (TMF) applied on components in a certain temperature range with variable state of stress (tensile and/or compression) produce localized concentration plastic strains that results crack initiation and propagation. The time evolution must be known priori to predict the lifetime part submitted TMF loadings, which requires an extensive campaign mechanical characterization conducted at different temperatures aging conditions. Such was proposed for aluminum alloy AlSi7Cu3.5Mg0.15 (Mn, Zr, V), is recognized as being creep resistant. Combined isothermal low-cycle tests were performed this determine constitutive parameters based Lemaître Chaboche (LM&C) viscoplastic model. These laws implemented within finite element simulation software (Z-set) model response thermomechanical test. Z-Set simulations, using LM&C adapted two conditions, then compared obtained from “Out Phase” testings (OP-TMF) Gleeble 3800 machine. modelling OP-TMF test revealed complexity behavior material induced by gradient prevailing along cylindrical specimen. It found better prediction taking into account larger strain rates conditions determination law eventually includes role microstructure behavior, starting first yield stress.