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A Theoretical and Experimental Study on the Dynamic Constitutive Model of Aluminum Foams

机译:铝泡沫动态本构模型的理论与实验研究

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The phenomenological constitutive framework for compressible elasto-plastic solids presented by Chen and Lu [1] is extended to the dynamic cases by assuming that the material parameter curves in the stress potential depend also on the strain rate. To check the applicability of the extended model, three types of dynamic experiments, i.e., uniaxial compression, lateral-constrained compression and side-constrained compression tests, are conducted for an open-cell aluminum foam at different strain rates. The first two types of dynamic tests are used as characteristic tests to determine the material parameter curves at different strain rates which are then used to construct the stress potential function in the model. The results show that the stress-strain curves under side-constrained compression predicted by the model are in agreement with those obtained experimentally.
机译:Chen和Lu [1]提出的可压缩弹塑性固体的现象学本构框架通过假设应力势中的材料参数曲线也取决于应变率而扩展到了动态情况。为了检查扩展模型的适用性,针对不同应变率的开孔泡沫铝进行了三种类型的动态实验,即单轴压缩,侧约束压缩和侧约束压缩测试。前两种类型的动态测试用作特性测试,以确定不同应变速率下的材料参数曲线,然后将其用于构建模型中的应力势函数。结果表明,该模型预测的侧约束压缩应力-应变曲线与实验结果吻合。

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