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염영진(Youngjin Yum),손진혁(Jinhyug Son),김원혁(Wonhyuck Kim),황정복(Jungbok Hwang),김선웅(Sunung Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An induction hardening technology has been implemented for increasing the strength of press-formed parts locally by high frequency induction heating, thereby eliminating the need for reinforcements. 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. In order to obtain the behavior of automotive parts, thermal transfer analysis was performed for the hat-shaped specimen under heat treatment process using LS-DYNA. Temperature distribution and deformed shape from the numerical results were in good agreement with the experimental results by high frequency induction heating process. Martensitic transformation was found in the heating zone through microscopic observation which showed higher hardness. Tensile strength and hardness of the hat-shaped boron steel part were found to increase remarkably by high frequency induction heating.
염영진(Youngjin Yum),김종국(Jonggook Kim),이현우(Hyunwoo Lee),황정복(Jungbok Hwang),김선웅(Sunung Kim),김원혁(Wonhyuck Kim),유승조(Seungjo Yoo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A hot stamping technology of vehicle door impact beam made of thin sheet steel has been developed, with the aim of ensuring occupant safety in a side collision. This technology has been implemented to increase the strength of vehicle body parts and to reduce not only the weight of door impact beam but also the number of work processes. Mechanical tests were performed to obtain material properties of hot-stamped specimen and those were used as input data in stamping and structural simulation for optimal design of door impact beam. Strength of hot-stamped door impact beam increased to the value 102% higher than that of conventional pipe-shaped door impact beam and structural simulation showed that hot-stamped door impact beam achieved 28% weight reduction.
박성우(Sungwoo Park),염영진(Youngjin Yum),김영삼(Youngsam Kim) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
Computational simulation of impact behavior of pass eng en car has been effectively performed to reduce the number of crash test. Material properties for the raw materials are used as input for the analysis, however, material properties for the real parts should be used to obtain more accurate results since they have changed during processing and welding. In this paper drop weight test was performed for the impact bracket of the cowl cross bar assembly to obtain material properties during impact. Static load test was also performed to use as basic data for analysis. Calculated load from linear momentum concept showed good agreement with average measured load.
하드타입 Invisible 조수석 에어백 전개부 플라스틱재의 고온, 저온 및 고 변형률 속도 하에서의 인장 특성에 관한 연구
김영삼(Youngsam Kim),박성우(Sungwoo Park),염영진(Youngjin Yum) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The Effect of strain rates and temperatures on the tensile properties of plastics were studied. Tear seam plastics, which are used in the hard IP invisible passenger airbag, were tested at various strain rates, and the stress-strain relations were obtained. And also tensile tests for the same plastics were performed at high and low temperatures, and the variations of the tensile properties with temperatures were acquired. The effects of the strain rates and temperatures on the tensile properties are discussed. The mechanical properties obtained from this research will be useful to estimate the airbag deployment accurately in engineering sense.
대형승합자동차의 최대안전경사각 시험의 국제기준조화를 위한 이론적 연구
이호권(Hokwon Lee),임현우(Hyunwoo Lim),염영진(Youngjin Yum) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Theoretical equations were formulated to harmonize domestic safety regulation with international safety regulation for stability test of a large size bus. Movement of vehicle gravity center was applied to calculation formula, and influence of spring rates was considered to supplement an accuracy. Masses, dimensions and angle of stability test of unladen vehicle were measured and then a weight of gross vehicle was calculated and the maximum an wle of stability test could be obtained. Finally we could harmonize domestic safety regulation with international one to use this formula with the result that prevent the damage due to stability test of gross vehicle and reduce a development costs and period.
김영삼(Youngsam Kim),박성우(Sungwoo Park),염영진(Youngjin Yum) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper deals with crash characteristics for the steel used in an CCB(Cross Car Beam). Computational simulation of impact behavior of passenger car has been effectively performed to reduce the number of crash test. Material properties for the raw materials are used as input for the analysis, however, mechanical material properties for the real parts should be used to obtain more accurate results since they have changed during processing and welding. In this paper drop weight test was performed for the impact bracket of the cowl cross bar assembly to obtain material properties during impact. Static load test was also performed to use as basic data for analysis. Calculated load from linear momentum concept showed good agreement with average measured load.
김영삼(Youngsam Kim),전치훈(Chihoon Jeon),염영진(Youngjin Yum) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Most automobile interior parts consist of plastic components. These components must satisfy several criteria, including the thermal-cycle resistance, vibration resistance, and impact resistance. The automobile industry is working to reduce the thermal deformation that occurs through periodical, seasonal changes. Essential material properties for thermal deformation simulation were acquired under various temperature conditions, such as stress-strain curve, dimensional change curve during thermal expansion and creep. It is necessary to obtain the material properties for thermal deformation analysis under the heat cycle test. Specially, creep data of plastic material was introduced to study the time-dependent deformation behavior of the instrument panel in heat cycle test. The test has been fitted into a time-hardening type creep constitutive equation. The time-hardening version of the power-law creep model was applied to account for the permanent deformation after heat cycle test, verified through the comparison of test result with FEA result for creep model.
인스트루먼트 패널의 온도에 따른 Creep 및 인장 특성에 관한 연구
김영삼(Youngsam Kim),임현우(Hyunwoo Lim),염영진(Youngjin Yum) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Vehicle interior parts composed of plastic usually deform under various temperature condition. The varying temperature induces thermal expansion of IP. The incompatibility of thermal expansion between various parts causes permanent deformation of plastic parts in conjunction with constraint conditions. Therefore, it is one of the key issue to minimize thermal deformation during developing IP. It is necessary to obtain the material properties for thermal deformation analysis under the heat cycle test. Specially, creep data of plastic material was introduced to study the time-dependent deformation behavior of the instrument panel in heat cycle test. The test has been fitted into a time-hardening type creep constitutive equation. The time-hardening version of the power-law creep model was applied to account for the permanent deformation after heat cycle test, verified through the comparison of test result with FEA result for simple model.
크로스 카 빔 Impact Bracket 압축 거동에 관한 연구
김영삼(Youngsam Kim),정동훈(Donghoon Chung),박성우(Sungwoo Park),염영진(Youngjin Yum) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The crash performance for driver and passenger safety becomes an essential factor in the design of vehicles. In order to estimate and improve the crash performance of practical automotive parts, dynamic crash test was conducted by using welding specimen composed of the materials with different strength and thickness. Computational simulation of impact behavior of passenger car has been effectively performed to reduce the number of frontal crash test. In this paper static load test was also performed to use as basic data for analysis. In this paper, first, reliable FE modeling technique for static load simulation was developed. And, using developed analysis model, a series of analysis was carried out to examine the effect of important design parameters on compression static load collapse characteristics. Also, the effect of welding in the impact bracket was discussed.