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An incremental-secant mean-field homogenization scheme for elasto-plastic and damage-enhanced elasto-plastic composite materials

机译:弹塑性与损伤增强弹塑性复合材料的增量割线平均场均化方案

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摘要

This paper presents an incremental secant mean-field homogenization process for composite materials made of elasto–plastic constituents, which can exhibit damage. In this formulation, the residual stress and strain states reached in the phases upon a fictitious elastic unloading, are considered as starting point to apply the secant method. The mean stress fields in the phases are then computed using isotropic secant tensors, which are naturally used to define the Linear Comparison–Composite. The method, remains simple in its formulation, is applied on various problems involving elastic, elasto–plastic and perfectly–plastic phases, to demonstrate its accuracy compared to other existing MFH methods. The method is particularly attractive when the damaging process is accounted for in the matrix phase. Indeed, during the damaging process of one phase, the secant method can account for the resulting unloading of the other phase, ensuring an accurate prediction of the scheme, when compared to direct numerical simulations.
机译:本文介绍了一种由弹塑性成分制成的复合材料的正割平均场均化过程,该过程可能会表现出损坏。在此公式中,在虚拟弹力卸载时在相中达到的残余应力和应变状态被视为应用割线法的起点。然后,使用各向同性割线张量计算各相的平均应力场,这些张量自然用于定义线性比较-复合。该方法的构造仍然简单,可应用于涉及弹性,弹塑性和完美塑性相的各种问题,以证明与其他现有MFH方法相比其准确性。当在基质阶段考虑破坏过程时,该方法特别有吸引力。确实,在一个阶段的破坏过程中,与直接数值模拟相比,割线方法可以解决另一阶段的最终卸载问题,从而确保了该方案的准确预测。

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