서지주요정보
접촉을 고려한 원호계면균열의 해석 및 응력강도계수 계산 = Analysis of circular arc-shaped interfacial crack with contact, and evaluation of stress intensity factor
서명 / 저자 접촉을 고려한 원호계면균열의 해석 및 응력강도계수 계산 = Analysis of circular arc-shaped interfacial crack with contact, and evaluation of stress intensity factor / 최낙윤.
발행사항 [대전 : 한국과학기술원, 1992].
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등록번호

8003220

소장위치/청구기호

학술문화관(문화관) 보존서고

DAE 92004

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A numerical method is proposed to obtain individual stress intensity factor in circular arc-shaped interfacial crack. The method is based on the path-independency of L integral and $M_L$ integral witch involves tow independent equilibrium fields, from witch each stress intensity factor at the crack tip may be evaluated from the displacements and stresses remote from the crack tip. Some numerical examples are presented to compare the accuracy of this method to the well known "method of extrapolation". It is found that the accurate values of each individual stress intensity factor $k_1$ and $k_2$ are obtained based on the present method without using very find meshes or singular elements at the crack tip. The effect of contact between the crack faces of an arc-shaped crack lying along the interface of a circular elastic inclusion embedded in an infinite matrix under remote uniaxial tension is examined by finite element method. It is seen that as the subtended angle of crack and the modulus of the inclusion increase the influence of contact on the stress intensity factors, energy release rate and crack energy, which means the change of potential energy due to crack, becomes larger. Also it is found that the influence of contact on the crack energy is negligible when the crack subtended angle of crack is smaller than about $60^0$. Theoretical estimates on the basis of the self-consistent method are made for the elastic moduli of unidirectionally fiber-reinforced composite having circular arc-shaped interfacial cracks. It is assumed that a single fiber having circular arc-shaped crack is embedded in a matrix of the effective elastic moduli to be sought, which is guided by the self-consistent method. Results are identified in terms of three parameters, i.e., crack density, η, fiber volume fraction, $V_f$, and representative crack angle $θ_0$. It is found that the stiffening effect of fiber in transverse plane disappers as the subtended angle of crack becomes larger than a certain value.

서지기타정보

서지기타정보
청구기호 {DAE 92004
형태사항 x, 97 p. : 삽화 ; 26 cm
언어 한국어
일반주기 부록 : A, 함수 $Φ_j(ξ)와 Ω_j(ξ).$
저자명의 영문표기 : Nack-Yoon Choi
지도교수의 한글표기 : 엄윤용
지도교수의 영문표기 : Youn-Yong Earmme
학위논문 학위논문(박사) - 한국과학기술원 : 항공우주공학과,
서지주기 참고문헌 : p. 55-61
주제 Fracture mechanics.
Finite element method.
Fibrous composites.
내부 균열. --과학기술용어시소러스
계면. --과학기술용어시소러스
응력 집중 계수. --과학기술용어시소러스
유한 요소법. --과학기술용어시소러스
복합 재료. --과학기술용어시소러스
Stress concentration.
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