TENSILE FAILURE OF NOTCHED CROSS-PLY LAMINATESTAKING INTO ACCOUNT THE INTERFACIAL DAMAGE
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摘要: 基于剪滞理论, 建立了一种计及界面损伤的分层剪滞模型, 分析了含割口的正交叠层板在拉伸荷载作用下的应力重新分布问题, 据此可求得界面损伤区长度和割口前缘完整纤维的应力集中因子。在此基础上,采用细观统计破坏理论, 研究了割口正交叠层板的拉伸破坏机理和强度, 定量获得了残余拉伸强度与界面剪切强度的关系, 所得结果与现有实验吻合较好。结果表明, 应力集中和强度与割口长度及界面剪切强度有关; 适宜的界面黏结, 具有较高的残余拉伸强度。Abstract: Based on the shear-lag theory , a layering shear-lag model taking into account the interfacial damage wasproposed and the st ress redist ributions for notched cross-ply laminates under tension were analyzed , f rom whichboth the length of the interfacial damage area and st ress concent ration factors in intact fibers at root of the notchwere obtained. On the basis of the knowledge of these st ress redist ributions , the tensile failure mechanism andst rengths of notched cross-ply laminates were studied by using a micro-statistical f racture theory. Consequently , therelation between residual tensile st rength and interfacial shear st rength was obtained quantitatively. The present result s are in good agreement with the existing experiment and show that both the st ress concent ration and st rengthare related to the interfacial shear st rength and the residual tensile st rength is relatively high when the interfacial cohesion is appropriate.
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