Statistical Investigation of Fatigue Life by Separating Crack Initiation and Propagation Lives
Statistical Investigation of Fatigue Life by Separating Crack Initiation and Propagation Lives
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通过分离裂纹萌生寿命和扩展寿命来统计疲劳寿命
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Tanaka
中科院分区：
文献类型：
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作者：
Sakae;Tanaka
通过将疲劳寿命（总寿命）Nf分解为裂纹萌生寿命Ni和裂纹扩展寿命Np，研究了Nf的统计性质。通过假设Ni和Np都遵循对数正态分布，并且Ni的变异系数大于Np的变异系数，通过使用Monte Carlo模拟从理论上推导出Nf的分布。也假设Ni和Np相互独立。结果表明，Nf近似服从复合对数正态分布。在转换点的左侧和右侧区域中，
A statistical nature of fatigue life (total life) Nf was studied by decomposing Nf into the crack initiation life Ni and crack propagation life Np. By assuming that both Ni and Np follow lognormal distributions and that the coefficient of variation is larger for Ni than for Np, the distribution of Nf was derived theoretically by using Monte Carlo simulation. Mutual independence of Ni and Np was also assumed. It was shown that Nf followed a composite log-normal distribution approximately. In the regions left of and right of the transition point, this composite distribution