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New self-consistent homogenization for thermo-elastic polycrystals with imperfect interfaces
Mechanics of Materials ( IF 3.9 ) Pub Date : 2021-04-01 , DOI: 10.1016/j.mechmat.2020.103651
Miroslav Zecevic , Kane C. Bennett , Darby J. Luscher , Ricardo A. Lebensohn

Abstract This paper presents a new thermo-elastic self-consistent formulation to calculate the thermo-mechanical response of polycrystalline aggregates with imperfect interfaces. The new model is based on an improved treatment of the effect of imperfect interfaces on the micromechanical response of the grains compared to pre-existing models. New expressions/algorithms are derived for the effective elastic and thermal properties, localization relations, and calculation of intragranular field fluctuations. In addition, derivation of a novel integral equation for the strain field in a heterogeneous elastic medium subjected to arbitrary thermal strain field and displacement jumps is presented. The new model is applied to study the effective thermo-elastic properties and average field fluctuations as a function of the interface properties for imperfectly-bonded triaminotrinitrobenzene (TATB) polycrystalline granular aggregates. The proposed formulation is general in the sense that it can be extended to other material systems and deformation regimes that require a proper consideration of the effect of imperfect interface properties on the material's thermo-mechanical response.

中文翻译:

具有缺陷界面的热弹性多晶的新型自洽均质化

摘要 本文提出了一种新的热弹性自洽公式来计算具有不完美界面的多晶聚集体的热机械响应。与现有模型相比,新模型基于对缺陷界面对晶粒微机械响应影响的改进处理。为有效的弹性和热特性、定位关系和粒内场波动的计算导出了新的表达式/算法。此外,还推导了受任意热应变场和位移跳跃影响的异质弹性介质中应变场的新积分方程。新模型用于研究作为不完全结合的三氨基三硝基苯 (TATB) 多晶颗粒聚集体的界面特性的函数的有效热弹性特性和平均场波动。所提出的公式是通用的,因为它可以扩展到其他需要适当考虑不完美界面特性对材料热机械响应影响的材料系统和变形范围。
更新日期:2021-04-01
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