지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 조용주
- 발행연도
- 2016
- 저작권
- 부산대학교 논문은 저작권에 의해 보호받습니다.
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Recently, Luu suggests fatigue life criteria which apply every term of the Crossland equation with stress gradient effect. Luu’s model, however, has a limit that it is not able to coverage small radius less than specific length.
In this paper, we made improvements of Luu''s equation and proposed new fatigue life criteria considering a stress gradient effect for rolling contact model. Fatigue analysis was performed to study the effect of stress gradient on fatigue life with newly adopted criteria equation and to compare the results with previous model’s. In order to do this, a series of simulation such as surface stress analysis, subsurface stress analysis and fatigue analysis are conducted for two rolling balls of same size which contact each other.
Fatigue life along depth was calculated with various fatigue criteria such as crossland equation, Luu’s equation and suggested equation. It was found that fatigue lifes with stress gradient effect are about 300,000 cycles longer than not. The effect of stress gradient size on fatigue life was also studied. Fatigue life was calculated for various radius balls with same von Mises stress. As expected, the larger stress gradients, the longer fatigue life.
In this paper, we made improvements of Luu''s equation and proposed new fatigue life criteria considering a stress gradient effect for rolling contact model. Fatigue analysis was performed to study the effect of stress gradient on fatigue life with newly adopted criteria equation and to compare the results with previous model’s. In order to do this, a series of simulation such as surface stress analysis, subsurface stress analysis and fatigue analysis are conducted for two rolling balls of same size which contact each other.
Fatigue life along depth was calculated with various fatigue criteria such as crossland equation, Luu’s equation and suggested equation. It was found that fatigue lifes with stress gradient effect are about 300,000 cycles longer than not. The effect of stress gradient size on fatigue life was also studied. Fatigue life was calculated for various radius balls with same von Mises stress. As expected, the larger stress gradients, the longer fatigue life.
목차
제1장 서론 1제2장 이론 52.1 해석 알고리즘 52.2 접촉 해석 62.3 표면 아래 응력 해석 112.4 피로 해석 132.4.1 응력 불변량 법 132.4.2 구배 효과를 고려한 응력 불변량 법 132.4.3 새로운 피로 판정식 182.4.4 피로 수명식 19제3장 해석 결과 213.1 피로한도식 213.2 표면 아래 깊이에 따른 피로수명 233.3 하중에 따른 피로수명 273.4 응력 구배에 따른 피로수명 29제4장 결론 32References 34Abstract 37
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