Method for evaluating breaking strength of defective particle composite material based on modified LEFI model

The invention discloses a method for evaluating the breaking strength of a defective particle composite material based on a modified LEFI model, and provides an inherent equivalent defect a * and establishes a defect (crack)-strength model related to a PBX material on the basis of a linear elastic breaking strength model (LEFM) in combination with a ceramic and concrete breaking mechanics research method. Wherein a * is closely related to the material characteristics of the PBX, the defect tolerance of the PBX can be evaluated, and the allowable environment range of the material can be defined. The inherent equivalent defect a * in the method can measure the defect tolerance of the PBX, the larger the a * is, the larger the size of the defect (crack) allowed by the material is, and a reference is provided for PBX mechanical property evaluation and allowable stress conditions. 本发明公开了一种基于修正LEFI模型评估含缺陷的颗粒复合材料断裂强度的方法，基于线性弹性断裂强度模型(LEFM)，结合陶瓷及混凝土的断裂力学研究方法，提出了固有等效缺陷a*，建立了一个有关PBX材料的缺陷(裂纹)-强度模型。其中，a*与PBX的材料特性密切相关，并可以此