Probabilistic treatment of microstructural effects on fatigue crack growth of large cracks

被引：10

作者：

Chan, KS

Torng, TY

机构：

[1] Southwest Research Institute, San Antonio, TX, 78238

[2] Space Systems Division, Downey, CA

来源：

JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME | 1996年 / 118卷 / 03期

关键词：

D O I：

10.1115/1.2806824

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A probabilistic model has been developed for treating the effects of microstructural variation on the fatigue crack growth response of large cracks in structural alloys. The proposed methodology is based on a microstructure-based fatigue crack growth law that relates the crack growth rate, da/dN, to the dislocation barrier spacing, yield stress, fatigue ductility coefficient, Youngs's modulus, and the dislocation cell size or crack jump distance. Probabilistic treatment of theses microstructure-dependent variables has led to a fatigue ductility coefficient, and the dislocation barrier spacing in the response equation. Applications of the probabilistic crack growth model to structural reliability analyses for steels and Ti-alloys are illustrated, and the probabilistic sensitivities of individual random variables are evaluated.

引用

页码：379 / 386

页数：8

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