【摘要】 近似求解了微裂纹演化系统随机偏微分方程．结果表明：当裂纹扩展速率的随机偏差正比于其平均速率时，材料损伤不随裂纹随机行为而变化．同时，还讨论了金属疲劳损伤随机波动程度的变化趋势．更多还原

【Abstract】 In this paper, the closed form of solution to the stochastic differential equation for fatigue crack evolution systems is derived, and the relationship between metal fatigue damage and crack stochastic behaviour is investigated. It is found that the damage extent of metals is independent of crack stochastic behaviour if the stochastic deviation of crack growth rate is directly proportional to its mean value. The evolution of stochastic deviation of metal fatigue damage in the stage close to final fracture is also discussed.更多还原