中文摘要：

基于有限断裂力学方法建立了一种预测多向复合材料开孔板拉伸强度的通用和半经验模型。该模型同时采用基于应力形式的失效准则和基于能量形式的失效准则预测失效。模型仅需铺层弹性常数、无缺口层合板的强度以及0°铺层的断裂韧性等参数。基于线弹性断裂力学建立了多向复合材料层合板的断裂韧性与0°铺层断裂韧性之间的关系,进而预测了任意铺层复合材料开孔板发生纤维主导拉伸失效时的强度。将模型预测结果与开孔板拉伸强度的试验数据进行了对比验证,预测误差最大为9.7%,与点应力和平均应力等方法的对比表明,该模型的预测精度高于传统的特征长度方法。

英文摘要：

A general and semi-empirical model was developed to predict the tensile strength of multidirectional com-posite laminates with open-holes using the finite fracture mechanics method.Both stress-based and energy-based failure criteria were used to predict failure in this model.The ply elastic constants,the laminate unnotched strength and the fracture toughness of 0°plies were the only material properties required by the model.The relation between fracture toughness of multidirectional composite laminate and that of 0°plies was established based on linear fracture mechanics.The strength of an open-hole composite laminate with any fiber dominated lay-ups was predicted.The model was validated by comparing its prediction results with test data of open-hole composite laminates.The maxi-mum predicting error is 9.7%.The model was also compared with point stress method and average stress method and results show that the present model provides more accurate predictions than the traditronal length method.