Transactions of the Korean Society of Mechanical Engineers (대한기계학회논문집)
- Volume 16 Issue 9
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- Pages.1691-1699
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- 1992
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- 1225-5963(pISSN)
DOI QR Code
A Stochastic Analysis of Crack Propagation Life under Constant Amplitude Loading
균일진폭 하중하에서의 확률론적 균열진전 수명해석
Abstract
The experimental results of fatigue crack propagation under constant amplitude loading show that intra-and inter-specimen variability exist. In this paper, a stochastic model for the estimation of mean and variance of crack propagation life is presented To take into account the intra-specimen variability, the material resistance against crack propagation is treated as an 1-dimensional spatial stochastic process, i. e. random field, varying along the propagation path. For the inter-specimen variability, C in paris equation is assumed to be a random variable. Compared with experimental results reported, the present method well estimate the variation in fatigue crack propagation life. And it is confirmed that the thicker the specimen thickness is, the less the variation of propagation life is.
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