Abstract
A new material model of magnesium alloys, combining both Hill’48 yield function and Cazacu’06 yield function, was developed and programmed into LS-DYNA using user subroutine, in which both slip dominant and twinning/untwinning dominant hardening phenomena were included. First, a cyclic load test was performed, and its finite element analysis was carried out to verify the new material model. Then, the deformation behaviors of the magnesium crash box subjected to the compressive impact loading were investigated using the developed material model. Compared with the experimental results, the new material model accurately predicted the deformation characteristics of magnesium alloy parts. Additionally, the effect of the thickness distribution, initial deflection and contact friction coefficient in simulation models on deformation behaviors were investigated using this validated material model.
Highlights
Magnesium alloys have been used in transportation, electronics, medical industries due to their good lightweight properties, machinability, corrosion resistance, shock absorption, dimensional stability and impact resistance
Developing a constitutive model of the magnesium alloys, is a rather challenging task compared to cubic metals because magnesium alloys have a hexagonal lattice structure, which affects the fundamental properties of these alloys
To conduct a finite elment analysis (FEA) simulation based on the constitutive model, which considered twinning, untwinning and slip modes, the introduced model was implemented to commercial FEA code LS-DYNA by using a user material subroutine
Summary
Magnesium alloys have been used in transportation, electronics, medical industries due to their good lightweight properties, machinability, corrosion resistance, shock absorption, dimensional stability and impact resistance. In automotive applicants, low-temperature components like brackets, covers, cases of modern automotive are made of magnesium alloys [1,2,3,4,5,6,7]. With good application prospects and great potential, magnesium alloys have become one of the hot issues of new materials in the future [13,14]. Numerical simulation is an important procedure for the design and optimization of magnesium alloy structures. A material model for magnesium alloys should be able to describe these anisotropy, asymmetry and temperature-dependent behaviors [15,16,17,18,19,20,21,22]
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