서지주요정보
계면균열에 대한 보존적분의 응용과 소성변형의 해석 = Application of conservation integrals and analysis of plastic deformation in an interfacial crack
서명 / 저자 계면균열에 대한 보존적분의 응용과 소성변형의 해석 = Application of conservation integrals and analysis of plastic deformation in an interfacial crack / 박재학.
발행사항 [서울 : 한국과학기술원, 1987].
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소장정보

등록번호

4104127

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 8703

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리뷰정보

초록정보

Properties of the J, L and M integrals, proposed by knowles and Sternberg for homogeneous materials are explored for bimaterial interfaces. The integrals are shown to satisfy the conservation law under suitable conditions such as the interfaces of perfect bond, frictionless contact, separation with no-slip or separation. Relations between the stress intensity factors and the conservation integrals for interfacial cracks in isotropic, linear-elastic materials are derived. The conservation integrals for some interfacial cracks are applied to get the stress intensity factors in a very simple way without solving the complicated boundary value problems. For interfacial cracks in finite-sized medium some numerical computations are carried out to verify the usefulness of the conservation integrals. It is also found that the use of the conservation integrals is more advantageous than the use of the stress intensity factors since the latter quantities are very sensitive to the local stress field, the nature of which is not clear as yet. An interfacial crack model is proposed to include the effect of plastic deformation in an interface crack, where plastic zones are assumed to have the form of a strip lying along the interface at each end of the crack and a frictionless contact zone is assumed to exist in order to prevent overlapping of the crack faces. This model is applied to a crack subjected to normal and shear loads at infinity, which is lying along the interface of two semi-infinite planes with different material properties. The crack and the plastic zones are represented by a continuous distribution of edge dislocations. The sizes of the plastic zones and the contact zone, and the contact stresses in the contact zone are obtained. The relation between the size of the plastic zone and the relative displacement at the crack tip is investigated. The J integral in this model is compared with the energy release rate of purely elastic solution. Out-of-plane shear loads are also considered in this model, where the size of the plastic zone, the crack tip opening displacement and the J integral are obtained in a closed form. Assuming the plastic zones spreading out on each slip plane of the two materials under out-of-plane shear loading, the size of each plastic zone is computed. It is found that the size of the plastic zone in each material is the same if we have the same frictional shear stress. The effect of the different frictional shear stresses in the two materials on the sizes of the plastic zones is also studied.

서지기타정보

서지기타정보
청구기호 {DME 8703
형태사항 viii, 151 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 접촉역을 가진 계면균열에서의 응력장의 점근해
저자명의 영문표기 : Jai-Hak Park
지도교수의 한글표기 : 엄윤용
지도교수의 영문표기 : Youn-Young Earmme
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 88-93
주제 Plastic analysis (Engineering)
Stress concentration.
Fracture mechanics.
Boundary value problems.
소성 변형. --과학기술용어시소러스
표면 균열. --과학기술용어시소러스
응력 집중 계수. --과학기술용어시소러스
경계치 문제. --과학기술용어시소러스
접촉 응력. --과학기술용어시소러스
Dislocations in metals.
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