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구름 및 미끄럼 접촉하의 중공원판의 표면하층균열에 대한 J-적분
이강용,김준엽,Lee, Kang-Yong,Kim, June-Yeop 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.7
J-integral for a subsurface horizontal crack in a circular plate with an inner hole under rolling line contact is evaluated according to loading positions with various load conditions, crack length and crack location. Two-dimensional crack is modeled, and the relation between Tresca stress for uncracked model and J-integral is discussed. The loading location which gives the maximum J-integral depends on load condition and crack location, and the presence of friction force increases Tresca stress and J-integral near the surface. Regardless of friction force, crack location that gives maximum J-integral is the same as that of maximum Tresca stress in an uncracked model, and the value of J-integral is propotional to crack length. It is also showed that the variation of an inner radius of a disk does not effect J-integral value.
가상차량 벨지안 주행해석을 통한 CTBA 내구하중 민감도 연구
유근수(Geunsoo Ryu),전재욱(Jae-Wook Jeon),김준엽(June-Yeop Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
With recent trends of the vehicle company reducing the number of making prototype and reliability test to reduce vehicle developing cost and time, VPG (Virtual Proving Ground) is a very useful and effective method to evaluate the vehicle performances such as Ride & Handling, NVH and durability in the concept design stage without vehicle prototype. This paper proposes the prediction method of the fatigue load changing with respect to the vehicle design variables such as body mass and inertia, ride height, wheel tread/base and tire aspect ratio/size using a VPG correlated with wheel input load of test results. This study also presents an application example of the developing vehicle shared same platform with base model without real vehicle prototype test using these parameter studies.