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International Journal of Automotive Technology 2007;8(5): 623-628. |
| STOCHASTIC CHARACTERISTICS OF FATIGUE CRACK GROWTH RESISTANCE OF SM45C STEEL |
| U. H. PARK1, H. W. LEE1, S. J. KIM2, C. R. LEE2, J. H. KIM2 |
1Pusan National University
2Pukyoung National University |
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| ABSTRACT |
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Reliability analysis based on fracture mechanics requires knowledge of the on statistical parameters m and C in the fatigue crack growth law da/dN=C(∆K)m. The purpose of the present study is to investigate if it is possible to explain the change of parameter m by the fluctuation of C only. In this study, we apply the Paris-Erdogan law treating the parameter C as random and the parameter m as constant. Fluctuations in crack growth rate are assumed to be dependent only on C. The material resistance to fatigue crack growth (Z=1/C) is treated as a spatially random process, that varies along the crack path. The theoretical crack growth rates at various stress intensity factors are discussed. Additionally, the results of constant ∆K fatigue crack growth tests are reported for the structural steel, SM45C. The experimental data have been analyzed to determine the probability distribution of fatigue crack growth resistanc. |
| Key Words:
Fatigue, Crack growth retsistance, Spatial random process, Probability distribution, Reliability analysis |
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