항공우주시스템공학회지 (Journal of Aerospace System Engineering)
- 제1권1호
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- Pages.45-52
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- 2007
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- 1976-6300(pISSN)
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- 2508-7150(eISSN)
알루미늄 합금 판재에서 예비압입에 의한 피로수명의 연장효과 분석
Analysis of the Extension Effects of Fatigue Life by Pre-Indentation in Aluminum Alloy Plates
초록
This paper analyzed the extension effects of fatigue life and the application of pre-indentation in aircraft structural material such as aluminum alloys. The test specimen used the thin sheet of aluminum alloy with a single-edged notch. The experiments were conducted after making the pre-crack under a constant amplitude loading. As the fatigue life extension technique, the pre-indentation making an indent on the predicted path of crack propagation was applied. The work presented here discussed about a proper mathematical relation between crack growth rate and the range of stress intensity factor and about the generalization of crack growth mechanism with large retardation effect. A technique to enhance the applicability of pre-indentation if also mentioned.
키워드