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[재료] STS 316L의 고온 피로균열에 미치는 인장유지시간의 효과
김문진(Moonjin Kim),임병수(Byeongsoo Lim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
The heat resistant material, in service, may experience static loading cyclic loading, or a combination of two. An experimental study of crack growth behavior of STS 316L austenitic stainless steel under fatigue, and creep-fatigue loading conditions were carried out on compact tension specimens at various tensile hold times. In the crack growth experiments under hold time loading conditions, tensile hold times were ranged from 5 seconds to 100 seconds and its behavior was characterized using the ??K parameter.<br/> The crack growth rates generally increase with increasing hold times. However in this material, the trend of crack growth rates decreases with increasing hold times for short hold time range relatively. It is attributed to a decline in the cyclic crack growth rate as a result of blunting at the crack tip by creep deformation<br/>
이상규(Sangkyu Lee),나욱진(Wookjin Na),김문진(Moonjin Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
To achieve ultra low weight, a bus body structure is proposed to be composed of various lightweight materials such as aluminum extrusions for the upper body, high strength steel for the chassis frame, and FRP for the outer panels. An Assembly method to apply diverse materials for their proper positions is the key point of developing a lightweight vehicle’s body. An engineering process to combine the heterogeneity of different materials in a body structure is investigated in this study.
박장운(Jangwoon Park),이혜원(Hyewon Lee),최영근(Younggeun Choi),박광애(Kwangae Park),김문진(Moonjin Kim),유희천(Heecheon You) 대한산업공학회 2015 대한산업공학회지 Vol.41 No.1
A bus seat is required to be ergonomically designed in terms of its shape and physical properties to increase seating comfort. The present study is intended to develop a systematic bus seat evaluation protocol based on seating comfort. A total of 48 participants evaluated 12 parts (seat belt, recliner, armrest, headrest, upper-back support, lumbar support, seatback bolster, seatback overall, hip support, thigh support, seatpan bolster, and seatpan overall) of 12 bus seats with 17 subjective comfort measures (e.g., convenience of control, suitability of size, and overall comfort). Lastly, ergonomic features of shape and physical properties of each seat part were identified based on the subject evaluation analysis results. The developed bus seat evaluation protocol can be applied to evaluate various types of seats.