서지주요정보
랜덤하중하의 피로균열닫힘과 진전거동 = Fatigue crack closure and growth behavior under random loading
서명 / 저자 랜덤하중하의 피로균열닫힘과 진전거동 = Fatigue crack closure and growth behavior under random loading / 김정엽.
저자명 김정엽 ; Kim, Chung-Youb
발행사항 [대전 : 한국과학기술원, 1993].
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등록번호

8003308

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 93003

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초록정보

Fatigue crack growth tests under random loading are performed and the behavior of crack closure and growth is investigated in detail. In particular, the effects of the characteristics and history length of random loading on the behavior of crack closure and growth are discussed. Moreover, single overloading, periodic overloading, and Hi-Lo(high-low) 2 step block loading tests are performed to compare the crack opening behavior under random and under simple variable amplitude loading. Crack length and crack closure are measured by an unloading elatic compliance method, and an automated method is developed to determine the crack opening point from differential displacement signal. To improve measurement precision, a noise reduction method using a digital filter is employed. This method can be used efficiently even for random loading. It is observed that crack opening point is nearly constant within a block of random loading and is higher than the value of constant amplitude loading corresponding to the highest load cycle. The crack opening behavior under random loading is mainly affected by the largest load cycle rather than the characteristics of random loading history. The fatigue crack growth rates under random loading can be well expressed in terms of the effective stress intensity factor range $\triangle{K}_{\mbox{eff}}$. The crack opening points rapidly increase after applying overload, and then decrease gradually. The maximum value of crack opening point under single overloading is agreed well with the crack opening value under random loading.

서지기타정보

서지기타정보
청구기호 {DME 93003
형태사항 viii, 108 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Chung-Youb Kim
지도교수의 한글표기 : 송지호
지도교수의 영문표기 : Ji-Ho Song
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 58-65
주제 Metals --Fatigue.
Materials --Dynamic testing.
Fractual mechanics.
Digital filters (Mathematics)
Stress concentration.
균열 전파. --과학기술용어시소러스
피로 균열. --과학기술용어시소러스
동하중. --과학기술용어시소러스
응력 집중 계수. --과학기술용어시소러스
잡음 감소. --과학기술용어시소러스
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