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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。
Based on the finite fracture mechanics method, a universal and semi-empirical model for predicting the tensile strength of multi-directional composite perforated plates was established. The model uses both failure modes based on stress forms and failure modes based on energy forms to predict failures. The model requires only parameters such as the lapping elastic constant, the strength of the unnotched laminate, and the fracture toughness of the 0 ° layup. Based on the linear elastic fracture mechanics, the relationship between the fracture toughness of multilayered composite laminates and the fracture toughness of 0 ° plies was established, and then the strength of the perforated plate with random laminates was predicted to be the dominant tensile failure. The prediction results of the model and the experimental data of tensile strength of perforated plate are compared and verified with the maximum prediction error of 9.7%. Comparing with the methods of point stress and average stress, the prediction accuracy of the model is higher than that of the traditional feature length method .