疲劳多裂纹扩展随机模型

建立了含相互干扰多裂纹结构的裂纹扩展随机模型.提出了远源裂纹、近源裂纹、概率寿命曲面等概念.给出了相互干扰多裂纹扩展随机微分方程的统一表达形式.在工程基本假设的基础上简化了相互干扰多裂纹扩展过程的计算.在此基础上可进一步分析含相互干扰多裂纹结构的可靠性,可直接应用于工程实践.

Random Model of Fatigue Multi-Crack Propagation

Stochastic damage tolerance method based on the stochastic fracture mechanics is one of the most important aspects of design and evaluation technique of aircraft structure. Stochastic damage tolerance analysis model is constituted with random crack propagation model and reliability analysis model. The random model of crack propagation corresponding to interactive multi crack has been presented in this paper. Some basic concepts are discussed, for instance: far cracks, near cracks, stochastic life camber. A unified differential equation of multi crack propagation is established. Basing on some engineering hypothesis, the calculation of crack propagation has been abbreviated. The damage tolerance technique has been developed in the paper. A large progress has been made on stochastic damage tolerance analysis of multi cracked structure.