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손진혁(Jin-Hyug Son),염영진(Young-Jin Yum),김원혁(Won-Hyuck Kim),황정복(Jung-Bok Hwang),김선웅(Sun-Ung Kim),유승조(Seung-Jo Yoo),이현우(Hyun-Woo Lee) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.6
An high frequency induction hardening technology of vehicle body press-formed of thin sheet steel has been developed to increase the strength of vehicle body parts locally by high frequency induction heating, thereby eliminating the need for reinforcements. And this technique for increasing the tensile strength of sheet steel was practically applied to the front floor cross member and center pillar reinforcement of a passenger car. The side impact behavior has been investigated when induction hardening technology is applied to the conventional low-carbon steel and weight reduction of an automotive body is expected. In this paper, basic experiments were performed for the hat-shaped specimen under high frequency induction heating process. Martensitic transformation was found in the heating zone through microscopic observation which showed higher hardness. In addition, the hardness and strength of the center-pillar specimen made of boron steel increased remarkably by high frequency induction heating.
〈학술논문〉섬유강화 복합재료를 이용한 자동차 단판스프링에 대한 연구
손진혁(Jin-Hyug Son),김종국(Jong-Kuk Kim),염영진(Young-Jin Yum) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Light weight tapered one leaf composite spring was designed and manufactured. Object function was a spring constant of equivalent steel leaf spring and design variables, thickness of the center and width were chosen using the response surface analysis. E-glass/epoxy and carbon/epoxy composite were chosen as candidate for tapered springs and finite element analysis showed that spring constants of optimally designed springs were in good agreement with that of steel leaf spring with error less than 2%. In order to verify experimentally tapered one leaf GFRP spring was manufactured and bending test was performed. Static spring constant was in good agreement with that of steel leaf spring and hysteresis curve was not found which leads to friction loss.