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Numerical investigation of dynamic shear bands in inelastic solids as a problem of mesomechanics

机译:非弹性固体中动态剪切带作为细观力学问题的数值研究

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摘要

The main objective of the present paper is to discuss very efficient procedure of the numerical investigation of the propagation of shear band in inelastic solids generated by impact-loaded adiabatic processes. This procedure of investigation is based on utilization the finite element method and ABAQUS system for regularized thermo-elasto-viscoplastic constitutive model of damaged material. A general constitutive model of thermo-elasto-viscoplastic polycrystalline solids with a finite set of internal state variables is used. The set of internal state variables is restricted to only one scalar, namely equivalent inelastic deformation. The equivalent inelastic deformation can describe the dissipation effects generated by viscoplastic flow phenomena. As a numerical example we consider dynamic shear band propagation in an asymmetrically impact-loaded prenotched thin plate. The impact loading is simulated by a velocity boundary condition, which are the results of dynamic contact problem. The separation of the projectile from the specimen, resulting from wave reflections within the projectile and the specimen, occurs in the phenomenon.
机译:本文的主要目的是讨论数值模拟非常有效的程序,该程序研究了冲击载荷绝热过程产生的非弹性固体中剪切带的传播。该调查程序基于有限元方法和ABAQUS系统对受损材料的正规化热弹-粘塑性本构模型的利用。使用具有有限内部状态变量集的热弹-粘塑性多晶固体的一般本构模型。内部状态变量集仅限于一个标量,即等效的非弹性变形。等效的非弹性变形可以描述由粘塑性流动现象产生的耗散效应。作为一个数值示例,我们考虑了动态剪切带在非对称冲击载荷预刻槽薄板上的传播。通过速度边界条件模拟冲击载荷,这是动态接触问题的结果。这种现象发生是由于弹丸和样本内的波反射而导致弹丸与样本分离。

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