Journal of the Korean Society for Precision Engineering (한국정밀공학회지)
- Volume 13 Issue 10
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- Pages.130-138
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- 1996
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
A study on the damage process of fatigue crack growth using the stochastic model
확률적모델을 이용한 피로균열성장의 손상과정에 관한 연구
- Lee, Won Suk ;
- Cho, Kyu Seoung ;
- Lee, Hyun Woo
- 이원석 (부산대학교 대학원 정밀기계공학과) ;
- 조규승 (부산대학교 대학원 정밀기계공학과) ;
- 이현우 (부산대학교 기계기술연구소)
- Published : 1996.10.01
Abstract
In general, the scattler is observed in fatigue test data due to the nonhomogeneity of a material. Consequently. It is necessary to use the statistical method to describe the fatigue crack growth process precisely. Bogdanoff and Kozin suggested and developed the B-model which is the probabilistic models of cumulative damage using the Markov process in order to describe the damage process. But the B-model uses only constant probability ratior(r), so it is not consistent with the actual damage process. In this study, the r-decreasing model using a monotonic decreasing function is introduced to improve the B-model. To verify the model, thest data of fatigue crack growth of A12024-T351 and A17075-T651 are used. Compared with the empirical distribution of test data, the distribution from the r-decreasing model is satisfactory and damage process is well described from the probabilistic and physical viewpoint.
Keywords