서지주요정보
랜덤하중하에서의 짧은 피로균열의 닫힘 및 진전거동 = Crack closure and growth behavior of short fatigue cracks under random loading
서명 / 저자 랜덤하중하에서의 짧은 피로균열의 닫힘 및 진전거동 = Crack closure and growth behavior of short fatigue cracks under random loading / 이신영.
저자명 이신영 ; Lee, Sin-Yeong
발행사항 [대전 : 한국과학기술원, 1999].
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등록번호

8010224

소장위치/청구기호

학술문화관(문화관) 보존서고

DADE 99004

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초록정보

Crack growth and closure behavior of short fatigue cracks are investigated for both constant amplitude and random loading. Also the effects of the frequency characteristics and history length of the random block loading are discussed. Tests are performed for various stress ratios using in-plane bending specimens of 2024-T351 aluminium alloy. Artificially prepared short through-thickness cracks are used. Crack length and closure of short cracks are measured by an unloading elastic compliance method. Under constant amplitude loading, short cracks grow faster than long cracks in the low stress intensity factor range region and growth rates of short cracks are influenced by the applied stress ranges. The growth rates of short cracks are well described by the effective stress intensity factor range. But the growth rates of short cracks lower than $3x10^{-9}m/cycle$ are much lower than that of long cracks for the same effective stress intensity factor range. It is observed that crack opening point of short fatigue crack under random loading is nearly constant within a block of random loading and is much lower than that under constant amplitude loading. The importance of the crack closure phenomenon is examined by predicting the growth lives of short cracks using obtained crack opening behavior. As in the constant amplitude loading, the fatigue crack growth and closure behavior of short cracks under random loading can be well described in terms of the effective stress intensity factor range.

서지기타정보

서지기타정보
청구기호 {DADE 99004
형태사항 xii, 128 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sin-Yeong Lee
지도교수의 한글표기 : 송지호
지도교수의 영문표기 : Ji-Ho Song
학위논문 학위논문(박사) - 한국과학기술원 : 자동화및설계공학과,
서지주기 참고문헌 : p. 51-56
주제 미소피로균열
균열닫힘
랜덤하중
유효응력강도계수폭
Short fatigue crack
Crack closure
Random loading
Effective stress intensity factor range
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