Oxidation and fracture of a woven 2D carbon-carbon composite
Oxidation and fracture of a woven 2D carbon-carbon composite
复制标题
DOI：
10.1016/0008-6223(91)90163-d
复制
发表时间：
1991
期刊：
影响因子：
10.9
通讯作者：
P. Crocker;B. Mcenaney
中科院分区：
文献类型：
--
作者：
P. Crocker;B. Mcenaney
测量了机织二维碳/碳复合材料在流动干燥空气中氧化前后的弯曲强度和动态弹性模量。用光学显微镜和扫描电子显微镜观察了材料的显微组织和断口。氧化优先攻击纤维/基质界面，削弱纤维束。未氧化的材料在层间和层内的束/束界面处发生分层破裂，从而导致灾难性的失效。随着氧化的进行，失效过程变成一个多步骤的过程，分层开裂较少，交叉束开裂较多。这种失效模式随氧化的改变归因于束内比束/束界面处更严重的攻击。氧化失重率为10%时，弹性模量和弯曲强度分别下降30%和50%。
Measurements were made of flexural strength and dynamic elastic modulus of a woven, 2D carbon-carbon composite before and after oxidation in flowing, dry air. The microstructure and fracture surfaces were examined using optical and scanning electron microscopy. Oxidation preferentially attacks the fibre/matrix interfaces and weakens fibre bundles. The unoxidised material fails catastrophically by delamination cracking between plies and at bundle/bundle interfaces within plies. As oxidation progresses, failure becomes a multistep process with less delamination cracking and more cross-bundle cracking. This change of mode of failure with oxidation is attributed to more severe attack within bundles than at bundle/bundle interfaces. For a weight loss on oxidation of 10%, the reduction in elastic modulus and flexural strength was 30% and 50% respectively.