Abstract
Magnesium alloys are widely used in automotive (steering wheel frames) and aerospace due to their lightweight, ductility, energy absorption and castability properties. Finite Element Analysis and design optimisation have driven the improvement of structural crashworthiness, stiffness, strength, durability, and NVH (noise vibration, harshness) performance, making it possible to meet both the safety requirements and weight reduction targets. The accuracy of the numerical methods is strongly dependent on the accuracy of the material models and parameters employed. This paper presents the numerical Simulation of the Charpy test for AM50 magnesium alloy. This standardised high-speed impact test method measures the energy absorbed by a standard specimen while breaking under an impact load. Numerical simulations were performed using Ansys LS-Dyna explicit solver combined with a Johnson-Cook material's law. Then a sensitivity study was performed using Ansys optiSLang to identify which of the input variables (JC parameters, test specimen's dimensions) has the most influence on the output variables (contact force and absorbed energy).
Highlights
Magnesiumalloys were first used in the mechanical industry in aerospace construction [1]
The investigations from [8] show that casting and subsequent hot rolling enables the production of magnesium alloy sheets containing grain refining additives
The results show, in general, good ductility and capacity to absorb energy for AM50 Magnesium alloy
Summary
Magnesiumalloys were first used in the mechanical industry in aerospace construction [1]. Due to their excellent rigidity, ductility, and high strength-to-weight ratios, magnesiumalloys increase their applications in various fields, from automotive to aerospace and biomedical engineering [2] [3] [4]. Magnesium alloys have been adopted for different structural and non-structural components [2] [5] [6] [7]. The investigations from [8] show that casting and subsequent hot rolling enables the production of magnesium alloy sheets containing grain refining additives. In as -cast conditions, all investigated additives increase the strength values compared to thebasealloys. Theeffects of thesolution treatment process and ageing treatments on the microstructure and mechanical properties of the AM50−4% (Zn, Y) alloy were investigated by Dai [9]
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