Thermo-elasto-viscoplastic constitutive laws for metallic alloys during their solidification

Joint 5th International Conference on Advances in Solidification Processes;5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining

土木建筑工程;计算机科学

Laschet, G.M.^1 ; Behnken, H.^1

ACCESS E.V., RWTH Aachen University, Intzestrasse 5, Aachen

D-52072, Germany^1

关键词: A356 aluminium alloy;    Alloy solidification;    Elasto-viscoplastic;    Isotropic hardenings;    Microstructural parameters;    Strength differences;    Tension and compression;    Thermomechanical behaviour;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/529/1/012083/pdf
DOI  :  10.1088/1757-899X/529/1/012083

来源: IOP

【 摘 要 】

To describe the thermomechanical behaviour of the semi-solid state during alloy solidification, specific viscoplastic constitutive laws are derived for the coherent and non-coherent regime of the mush. For the coherent semi-solid regime an original viscoplastic flow potential is derived, which includes micro-structural parameters. This potential takes also isotropic hardening, pressure dependence of yielding and the strength difference in tension and compression into account. For the non-coherent mushy state of suspensions under shear loading, a simplified viscoplastic potential is adopted by neglecting pressure effects on the solid dendrites. Continuity at mechanical coherency is imposed and allows the reduction of the model parameters of the non-coherent regime. The developed constitutive laws are implemented in Abaqus via a user-defined CREEP routine. Simulations of uniaxial tension, compression or pure shear experiments allow identifying the model parameters of an A356 aluminium alloy.