Influence of applied in-plane strain on transverse thermal conductivity of 0°/90° and plain weave ceramic matrix composites
Influence of applied in-plane strain on transverse thermal conductivity of 0°/90° and plain weave ceramic matrix composites
复制标题
面内应变对0°/90°和平纹陶瓷基复合材料横向导热系数的影响
DOI：
10.1016/j.ijsolstr.2010.11.017
复制
发表时间：
2011
影响因子：
3.6
通讯作者：
Zhang D
中科院分区：
文献类型：
--
作者：
Zhang D
一个计算经济的有限元为基础的应力分析模型，作者以前开发的，已被扩展到预测陶瓷基复合材料的热行为与应变引起的损伤。有限元分析利用一个固体元素来表示一个均匀的正交各向异性介质的非均匀单向丝束。非线性多轴应变相关的热行为已被离散的多线性曲线，这已经实现了由用户定义的子程序，USDFLD，在商业有限元软件包，ABAQUS。该模型已被用于研究两种CMC复合材料的性能：SiC（Nicalon）纤维-钙铝硅酸盐（CAS）基体，0°/90°交叉铺层层Nicalon-CAS;和，碳纤维-双碳-SiC基体（C/C-SiC），平纹层压板DLR-XT。预测了复合材料单轴应变下整体厚度导热系数的下降。两种材料的预测和实验数据之间进行了比较，并取得了良好的一致性。对于Nicalon-CAS 0°/90°交叉铺层，热导率降低的主要机制是纤维失效和相关尾流脱粘的组合;对于DLR-XT平纹组织，相同的机制与面外剪切失效一起起作用。
A computationally economic finite-element-based stress analysis model, developed previously by the authors, has been extended to predict the thermal behaviour of ceramic matrix composites with strain-induced damage. The finite element analysis utilises a solid element to represent a homogenised orthotropic medium of a heterogeneous uni-directional tow. The non-linear multi-axial strain dependent thermal behaviour has been discretised by multi-linear curves, which have been implemented by a user defined subroutine, USDFLD, in the commercial finite element package, ABAQUS. The model has been used to study the performance of two CMC composites: a SiC (Nicalon) fibre-calcium aluminosilicate (CAS) matrix, 0°/90° cross-ply laminate Nicalon-CAS; and, carbon fibre-dual carbon-SiC matrix (C/C-SiC), plain weave laminate DLR-XT. The global through-thickness thermal conductivity degradation with composite uni-axial strain has been predicted. Comparisons have been made between the predictions and experimental data for both materials, and good agreement has been achieved. For the Nicalon-CAS 0°/90° cross-ply the dominant mechanism of thermal conductivity degradation is combined fibre failure and associated wake debonding; and, for the DLR-XT plain weave the same mechanisms act in combination with out-of-plane shear failure.