Extension of a fourth-order damage theory to anisotropic history: Application to ceramic matrix compostites under a multi-axial non-proportional loading
Extension of a fourth-order damage theory to anisotropic history: Application to ceramic matrix compostites under a multi-axial non-proportional loading
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DOI：
10.1177/1056789516674766
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发表时间：
2018-02
影响因子：
4.2
通讯作者：
E. Baranger
中科院分区：
文献类型：
--
作者：
E. Baranger
陶瓷基复合材料在高温或极高温下具有良好的热机械性能。两种脆性材料（例如SiC纤维和SiC基体）通过界面的联盟允许由于裂纹偏离而导致的伪延性宏观行为。使用损伤力学的裂纹网络的建模是不直接的。主要原因是存在由载荷方向定向的裂纹网络，这是先验未知的。本文的目的是扩展各向异性损伤模型能够描述这种行为的多轴载荷。为此，顺应性张量损伤变量中使用的热力学势能够考虑裂纹闭合效应。损伤运动学最初是完全自由的，并由演化规律施加。本文的重点是考虑各向异性的损伤历史。所得到的结果是把有关交替扭转试验进行SiC/SiC管和丰富的仪器。
Ceramic matrix composites have good thermo-mechanical properties at high or very high temperatures. The alliance of two brittle materials (e.g. SiC fibers and SiC matrix) via an interface allows a pseudo-ductile macroscopic behavior due to crack deviation. The modeling of the crack networks using damage mechanics is not straight forward. The main reason is the presence of a crack network oriented by the loading direction, which is not known a priori. The aim of this paper is to extend an anisotropic damage model able to describe such behaviors to multi-axial loadings. For that, compliance-like tensorial damage variables are used in a thermodynamic potential able to account for crack closure effects. The damage kinematic is initially completely free and imposed by the evolution laws. The key point of the present paper is to account for an anisotropic history of damage. The results obtained are put in relation to alternate torsion tests performed on SiC/SiC tubes and richly instrumented.