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Dynamic compressive strength properties of aluminium foams. Part Ⅱ—'shock' theory and comparison with experimental data and numerical models

机译:泡沫铝的动态抗压强度特性。第二部分“冲击”理论及其与实验数据和数值模型的比较

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摘要

One-dimensional 'steady-shock' models based on a rate-independent, rigid, perfectly-plastic, locking (r-p-p-l) idealisation of the quasi-static stress-strain curves for aluminium foams are proposed for two different impact scenarios to provide a first-order understanding of the dynamic compaction process. A thermo-mechanical approach is used in the formulation of their governing equations. Predictions by the models are compared with experimental data presented in the companion paper (Part Ⅰ) and with the results of finite-element simulations of two-dimensional Voronoi honeycombs. A kinematic existence condition for continuing 'shock' propagation in aluminium foams is established using thermodynamics arguments and its predictions compare well with the experimental data. The thermodynamics highlight the incorrect application of the global energy balance approach to describe 'shock' propagation in cellular solids which appears in some current literature.
机译:提出了一种基于速率独立,刚性,完美塑性,锁定(rppl)的铝泡沫准静态应力-应变曲线理想化的一维“稳定冲击”模型,该模型针对两种不同的冲击场景提供了第一个动态压实过程的顺序理解。在制定其控制方程式时使用了热机械方法。将模型的预测结果与随附论文(第一部分)中提供的实验数据以及二维Voronoi蜂窝的有限元模拟结果进行了比较。利用热力学论证建立了泡沫铝中“冲击”持续传播的运动学存在条件,其预测结果与实验数据进行了比较。热力学强调了目前在一些文献中出现的全局能量平衡方法在描述细胞固体中“冲击”传播中的错误应用。

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