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Micromechanical modelling of cohesive thermoelastic cracking in orthotropic polycrystalline materials

机译:正交各向异性多晶材料内聚热弹性裂纹的微观力学建模

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In this paper a new micromechanical formulation is proposed for modelling thermoelastic intergranular and transgranular damage and microcracking evolution in brittle polycrystalline materials. Polycrystalline microstructures are created through a Voronoi tessellation algorithm. Each crystal has an elastic orthotropic behaviour. Damage evolution along (inter- or trans-granular) interfaces is modelled using thermo-mechanical cohesive laws and, upon failure, non-linear frictional contact analysis is introduced to model separation, stick or slip. Numerical simulations are presented either to demonstrate the validity and study the physical implications of the proposed thermoelastic formulation, in comparison with other numerical methods as well as experimental observations and literature results. (C) 2018 Elsevier B.V. All rights reserved.
机译:本文提出了一种新的微机械公式,用于模拟脆性多晶材料中的热弹性晶间和跨晶损伤以及微裂纹的演化。通过Voronoi镶嵌算法创建多晶微结构。每个晶体具有弹性的正交各向异性行为。沿(晶间或跨晶间)界面的损伤演化是使用热机械内聚规律进行建模的,一旦失效,就会引入非线性摩擦接触分析来建模分离,粘连或滑移。与其他数值方法以及实验观察和文献结果相比,数值模拟可以证明其有效性并研究所提出的热弹性公式的物理含义。 (C)2018 Elsevier B.V.保留所有权利。

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