서지주요정보
Hertzian 이동화중을 받는 표면밑 계면균열문제의 유한요소해석 = Finite element analysis of subsurface interfacial crack subjected to hertzian moving load
서명 / 저자 Hertzian 이동화중을 받는 표면밑 계면균열문제의 유한요소해석 = Finite element analysis of subsurface interfacial crack subjected to hertzian moving load / 조용주.
저자명 조용주 ; Cho, Yong-Joo
발행사항 [대전 : 한국과학기술원, 1994].
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소장정보

등록번호

8004195

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 94001

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초록정보

Subsurface crack/interfacial crack subjected to IIertzian moving load is analyzed by the finite element method to understand the phenomena of the spalling of coatings in wear. The effects on the behavior of subsurface crack or interfacial crack, of various factors such as the crack length, Hertzian contact length, coating thickness, friction coefficients of the crack surface and the loading surface and combinations of the material of the coating layer and substrate are discussed in terms of the mode II stress intensity factor. If the Hertzian contact length and the crack length are sufficiently large, compared to the depth of the subsurface crack(or thickness of the coating layer), the crack surface is completely closed while the load passes above the crack, which is quite distinguished from the case of the concentrated loading(i.e. zero hertzian contact length). Moreover as the Hertzian contact length is increased, $ΔK_II$ is decreased. When the friction coefficient of the loading surface is smaller than that of the crack surface $ΔK_II$ shows a maximum value and decrease monotonically as the coating thickness gets smaller. On the other hand, $ΔK_II$ shows a maximum value, subsequently a minimum value and increses monotonically as the coating thickness gets smaller when the friction coefficient of the loading surface is larger than that of the crack surface. The friction coefficient of the crack surface generally decreases $ΔK_II$ and its effect is more evident when the ratio, the coating thickness/the crack length is large. However the ratio is small, the value of $ΔK_II$ is dominantly affected by the difference between the friction coefficients of the crack surface and the loading surface. The dependency of $ΔK_II$ on the thickness of the coating layer with the Dundurs' parameter α and β varying is examined and it is found that the trend is somwhat similar to that of the surbsurface crack in the homogeneous material. As α is algebrically increased, $ΔK_II$ gets smaller and the thickness $t_min$ which is defined to be the thickness of the coating layer when $ΔK_II$ is a minimum, gets smaller. As β is algebraically increased, $ΔK_II$ gets smaller, however, the thickness $t_min$ gets larger in the case.

서지기타정보

서지기타정보
청구기호 {DME 94001
형태사항 x, 101 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Yong-Joo Cho
지도교수의 한글표기 : 엄윤용
지도교수의 영문표기 : Youn-Young Earmme
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 46-51
주제 Fracture mechanics.
Stress concentration.
Mechanical wear.
Friction.
유한 요소법. --과학기술용어시소러스
표면 균열. --과학기술용어시소러스
동하중. --과학기술용어시소러스
마찰. --과학기술용어시소러스
마모. --과학기술용어시소러스
Finite element method.
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