Prediction of stress-strain and fracture behaviour of an 8-Harness satin weave ceramic matrix composite
Prediction of stress-strain and fracture behaviour of an 8-Harness satin weave ceramic matrix composite
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DOI：
10.1016/j.ijsolstr.2014.07.010
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发表时间：
2014-10
影响因子：
3.6
通讯作者：
Daxu Zhang;D. Hayhurst
中科院分区：
文献类型：
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作者：
Daxu Zhang;D. Hayhurst
一个计算经济的有限元为基础的方法已被开发来预测的应力-应变和断裂行为的8-缎编织陶瓷基复合材料与应变诱导损伤。有限元分析利用实体单元来模拟均质正交各向异性单向丝束及其矩阵的行为。丝束和基质的支撑模型（Tang等人，2009）捕获纤维和基质之间相互作用的物理学;并且，以这种方式，允许桥接纤维和全尺寸组件的长度尺度的建模。复合材料的非线性多轴应力-应变行为已被离散化的多线性弹性曲线，后者已被用作输入到用户定义的子程序，UMAT，在商业有限元软件包，ABAQUS。本文建立了碳纤维嵌入无定形碳基体中的8维缎纹编织复合材料HITCO C/C的部分单胞模型。预测的全球应力-应变曲线，其中包括纤维波纹度的影响，已作出两种故障模式：第一个由变形局部化，和第二个由动态丝束故障的纤维断裂，触发瞬时拔出失活。预测和实验数据之间进行了比较，表现出两类断裂行为：脆性和准韧性。的预测结果，无论有没有两个波度，比较以及与实验数据，然而，波度的预测略好。两个极端的实验行为已被发现符合两个拖断裂准则建模。
A computationally economic finite-element-based approach has been developed to predict the stress–strain and fracture behaviour of an 8-Harness satin woven ceramic matrix composite with strain-induced damage. The finite element analysis utilises a solid element to model the behaviour of the homogenised orthotropic uni-directional tow and its matrix. The underpinning models of the tow and matrix, (Tang et al., 2009) capture the physics of the interactions between fibres and matrix; and, in this way, permit modelling that bridges the length scales of the fibres and full-scale components. The non-linear multi-axial stress–strain behaviour of the composite has been discretised by multi-linear elastic curves; and the latter has been used as input to a user defined subroutine, UMAT, in the commercial finite element package, ABAQUS. A partial unit cell model has been constructed of the 8-Harness satin weave composite of carbon fibres embedded in an amorphous carbon matrix, HITCO C/C. Predictions of the global stress–strain curve, which include the effects of fibre waviness, have been made for two failure modes: the first by deformation localisation, and the second by dynamic tow failure on fibre fracture, triggered by instantaneous pull-out deactivation. Comparisons have been made between the predictions and experimental data that exhibit two classes of fracture behaviour: brittle and quasi-ductile. The predicted results, both with and without tow waviness, compare well with the experimental data; however, the predictions for waviness are slightly better. The two extremes of experimental behaviour have been found to correspond with the two tow fracture criteria modelled.