基于局域分析的疲劳短裂纹群体演化随机模型

A STOCHASTIC MODEL FOR EVOLUTION OF COLLECTIVE SHORT-FATIGUE-CRACKS BASED ON LOCAL FIELD ANALYSIS 1)

摘要: 采用局域裂纹数密度描述金属材料中不同局部区域的疲劳短裂纹群体损伤的发展情况通过考虑在不同局域存在的材料性质的随机涨落及局部损伤对损伤总量发展的影响，建立了局域裂纹数密度演化随机方程对方程数值求解从而模拟了材料的疲劳短裂纹损伤过程结果显示出主裂纹出现的随机性，并讨论了裂纹总数与最大裂纹尺度在统计意义上的演化特征
- 疲劳短裂纹 /
- 局域裂纹数密度 /
- 群体损伤 /
- 随机演化
Abstract: It has been observed that, the evolution process of short fatigue cracks in some metallic materials presents collective damage characteristics The cumulation of the damage is produced by a number of short fatigue cracks The extent of damage is not dependent on a single crack, but on the whole response of total short cracks For this situation, we adopted the method of the balance of crack number density to describe such an evolutionary process The basic consideration of the model is that, at a certai...
- short fatigue cracks /
- local crack numerical density /
- collective damage /
- stochastic evolution

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