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Behaviour of Al6061-T6 alloy at different temperatures and strain-rates: Experimental characterization and material modelling

机译：Al6061-T6合金在不同温度和应变率下的行为：实验表征和材料建模

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The simulation of impact scenario against a structure requires the use of material models able to reproduce all aspects of the mechanical behaviour of the involved materials; plastic flow is one of the main aspects to be reproduced. In more detail, attention has to be paid to the investigation of strain-rate and temperature sensitivities, as well as their interaction, which necessitates the use of a reverse engineering approach. The present paper mainly focuses on the tensile behaviour and an ad-hoc testing campaign was performed on cylindrical dog-bone specimens made in Al6061T6 at different temperatures and strain-rates extending the range up to a level where, at present, there is a lack in the scientific literature. The thermal softening effect was investigated in quasi-static as well as in dynamic loading conditions from room temperature up to 400 °C; while the material strength dependence on the strain-rate was studied up to 104s−1on miniaturized samples. Microstructure analyses were performed to better investigate the mechanical response at different loading conditions. The parameters of the Johnson-Cook model were identified starting from experimental data via a numerical inverse approach based on FEM simulations. These parameters can be used for simulations of extreme loading scenario like ballistic impact events.
机译：针对结构的碰撞场景模拟需要使用能够再现所涉及材料的机械行为各个方面的材料模型。塑性流动是要复制的主要方面之一。更详细地说，必须注意应变率和温度敏感性及其相互作用的研究，这需要使用逆向工程方法。本文主要关注拉伸性能，并在不同的温度和应变率下对Al6061T6制成的圆柱状狗骨样品进行了专门的测试活动，将其范围扩大到目前缺乏的水平在科学文献中。在室温至400 C的准静态和动态负载条件下研究了热软化效果；在最小化的样品上，材料强度对应变率的依赖性高达104s-1。进行了微结构分析，以更好地研究不同载荷条件下的机械响应。 Johnson-Cook模型的参数是通过基于有限元模拟的数值逆方法从实验数据中识别出来的。这些参数可用于模拟极端负荷情况，例如弹道撞击事件。

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