발간논문

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Vol.31, No.8, 994 ~ 1004, 1993
Title
Life Prediction Based on the Analysis of Crack Closure Phenomenon under Fatigue Loading
박기종K . J . Park, 이종수C . S . Lee, 장영원Y . W . Chang, 전제춘J . C . Jeon, 권동일D . I . Kwon
Abstract
In this study, the crack closure phenomenon was investigated for conservative prediction of fatigue life time. Based on previous experimental results and theoretical analysis, it was expected that the variation of normalized crack closure stress with ΔK could be classified into three regimes. This classification concept was reflected in considering a fatigue crack growth rate equation. In addition to crack opening displacement method and back face strain gage method, acoustic emission technique was introduced to measure local microbehavior of crack closure at the crack tip of CT specimens of 2024-T8 Al alloy. Acoustic emission technique was found to yield better closure results successfully. Finally, FASTRAN program was adapted and executed to predict crack growth rates in the cyclic stress state. The predicted values were relatively consistent with experimental ones except near ΔK_(th) in both CCT and one through crack at hole specimens.
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