Abstract
This paper presents the experimental methodology used by R&D EMEA – Global Materials Labs Department to test metals at high strain rate of 500 s −1 . The implementation of dynamic results in commercial FEM Software LS – DYNA for crash simulation are presented. The effects of the strain rate on the tensile properties of metals, used in automotive field, are evaluated using results obtained from a direct tension split Hopkinson bar, built in collaboration with the University of Applied Sciences of Southern Switzerland DynaMat Lab. Finally the complete mechanical characterization of the Magnesium alloy AZ31B is presented, from static up to dynamic tests, showing its applications in FCA (Fiat Chrysler Automobiles), problems and future developments.
Highlights
Mechanical behaviour of materials can change at high strain rates
The results clearly show that the AZ31B alloy is very sensitive to the strain rate; the flow stress increases
The experimental methodology used by GML to test materials at high strain rates is presented in this paper
Summary
By increasing the strain rate many materials show hardening effect, a decrease in failure strain and an increase in strength This is a very important topic in the automotive field, where there are a lot of mechanical components subject to impulsive loads; automotive crashworthiness is one such example. Physic based model can provide more accurate representation of material behaviour over a wide range of temperature and strain rates, they are not preferred because they require more data from some controlled experiments. For this reason phenomenological models are preferred in practical applications such as numerical simulations of components subjected to impulsive loads [12,13,14]. The complete characterization of the Magnesium alloy AZ31B will be presented, from static up to dynamic tests, showing its applications, problems and future developments
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