割口单向叠层板的拉伸应力集中与强度

TENSILE STRESS CONCENTRATIONS AND STRENGTHS FOR NOTCHED UNIDIRECTIONAL LAMINATES

基于剪滞理论,建立一种分层剪滞模型,分析了含割口的单向叠层板在拉伸载荷作用下的应力重新分布问题,获得了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,研究了割口单向叠层板的拉伸破坏强度,得到了与现有实验较吻合的结果.

Based on the shear-lag theory, the stress redistributions for notched unidirectional laminates under tension were analyzed by establishing a layering shear-lag model. The stress concentration factors in intact fibers at root of the notch were obtained. On the basis of the knowledge of these stress redistributions, the tensile strengths of notched unidirectional laminates were studied by using a statistical fracture theory. The present results have a relatively good agreement with the existing experimental values.