대한기계학회논문집 (Transactions of the Korean Society of Mechanical Engineers)
- 제8권1호
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- Pages.26-33
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- 1984
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- 1225-5963(pISSN)
DOI QR Code
彈塑性 疲勞균열進展과 J積分
Elastic-Plastic Fatigue Crack Growth and J Integral
초록
Constant-load-amplitude fatigue crack growth tests were carried out on 5083-0 aluminum alloy under elastic and elastic-plastic conditions. Crack length, crack closure and monotonic fatigue deformation were measured by Kikukawa's unloading elastic compliance monitoring technique and elastic-plastic fatigue crack growth rates were analysed in terms of J integral. Elastic-plastic fatigue crack growth rates can be well expressed by effective cyclic J integral until general yielding occurs. Beyond general yielding, monotonic fatigue deformation becomes significant and growth rates cannot be characterized by a single parameter of effective cyclic J integral alone. However, introducing one more parameter, maximum J integral J
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