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[구조강도부문] 동적 구성방정식을 적용한 자동차 차체 구조물의 충돌 특성 분석
강우종(Woojong Kang),허훈(Hoon Huh) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The crashworthiness of vehicles with finite element method depends on the geometry modeling and material properties. In order to ensure the impact characteristics of auto-body structures by a finite element method, the dynamic behavior of sheet metals must be examined. In this paper, high strain rate tensile tests have been carried out with a tension type split Hopkinson bar apparatus specially designed for sheet metals. Simulation of auto body structures has been carried out by an elasto-plastic finite element method with explicit time integration. The crash worthiness of auto-body structures analyzed with quasi-static constitutive relation is compared with the one with rate dependent constitutive model. The frontal frames and a square tube used in numerical simulation. The impact characteristics such as the deformed shapes and the impact energy absorption of auto-body structures are investigated with the variation of the strain rate.
[구조강도부문] 동적 구성방정식을 적용한 자동차 차체 구조물의 충돌 특성 분석
강우종(Woojong Kang),임지호(Jiho Lim),허훈(Hoon Huh),한수식(Susik Han) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The crashworthiness of vehicles with finite element method depends on the geometry modeling and material properties. In order to ensure the impact characteristics of auto-body structures by a finite element method, the dynamic behavior of sheet metals must be examined. In this paper, high strain rate tensile tests have been carried out with a tension type split Hopkinson bar apparatus specially designed for sheet metals. Simulation of auto body structures has been carried out by an elasto-plastic finite element method with explicit time integration. The crashworthiness of auto-body structures analyzed with quasi-static constitutive relation is compared with the one with rate dependent constitutive model. The frontal frames, the hood and a square tube used in numerical simulation. The impact characteristics such as the deformed shapes and the impact energy absorption of auto-body structures are investigated with the variation of the strain rate.
저속 충돌시 수리비 저감을 위한 차체 프런트 구조 최적화
강우종(Woojong Kang),배한일(Hanil Bae) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
The impact energy in low speed crash must be absorbed locally in the front structure with no damage in the rear part of an auto-body. The repair cost in a low speed crash could be reduced by establishing energy absorbing element such as a crash box. In this paper, the front structure of an auto-body is designed to reduce the repair cost in a low speed crash accident The strength and energy absorbing ability of a crash box is also related with 5mph bumper performance. A compromise solution is acquired from an optimization process with DOE and RSM to satisfy the 5mph bumper and 15kph crash performances.<br/> <br/> <br/>
강우종(Woojong Kang),이성윤(Sungyun Lee),이욱환(Wookhwan Lee),김성태(Sungtae Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The composite material was developed for the light weight design of an automotive FEM(front end module) carrier. Material code 1412 and 1512 for the FEM carrier were tested to investigate the strain rate effects. A drop tower type of high speed tensile apparatus was developed for tests at strain rates of about 15/s and 100/s. Three kinds of tensile specimens designed based on ASTM D638 were investigated to determined the adequate gauge width of tensile specimen for fiber reinforced composite. Gauge width of 6㎜, 8㎜ and 10㎜ were investigated. Test results showed the specimen of 8㎜ width was adequate for the high strain rate tensile tests of fiber reinforced composite. It was found the strength of the composite material increased as the strain rate increased.
승용 연료전지 차량의 하중 특성 연구를 위한 주행시험 및 차량 동역학 해석
강종수(Jongsu Kang),김기훈(Gihoon Kim),강우종(Woojong Kang),김대성(Daeseung Kim),김용민(Yongmin Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The test vehicle was reworked considering the position and weight of the main parts in the fuel cell vehicle. Driving tests were carried out in the PG of KATECH after many sensors were attached in the vehicle. As result, wheel force and strains at frame are measured. The acquired data was also analyzed to compare the characteristic of gasoline and fuel cell vehicle. Multi-body dynamics model of the full vehicle was constructed to extract and compare the loads of main position. As one of the applications of the virtual model, simple impact and driving simulations have been carried out between the vehicle model and a salient road. The impact load and reaction load at the mounting points of components was extracted for the verification of the safety of tile component.
신재호,김경진,강우종,Shin, Jaeho,Kim, Kyungjin,Kang, Woojong 한국자동차안전학회 2015 자동차안전학회지 Vol.7 No.3
Brake pads are a component of disc brake system of automobile and consist of steel backing plates and friction material facing the disk brake rotor. Due to the repeated sliding forces and torque in vehicle braking, friction performance of brake pads are ensured. Futhermore, the brake pad is one of major tuning components in aftermarket, mechanical characteristics of the brake pad are necessary to evaluate for establishing the certification standards of tuning components. This study had performed the five specimen tests for friction coefficients and wear loss rates according to the SAE test specification. Using the instrumented indentation method, yield strength and tensile strength were measured. Friction coefficients, 0.386 - 0.489, and wear loss rates, 1.0% - 3.7% are obtained. The range of yield strength and tensile strength are 21.4 MPa - 105.3 MPa and 39.5 MPa - 176.4 MPa respectively.
모듈 내구시험시 Wheel Adapter의 중량 영향성 평가
강종수(Jongsu Kang),김기훈(Gihoon Kim),강우종(Woojong Kang),김대성(Daeseung Kim),이상헌(Sangheon Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The suspension systems of module unit are being evaluated to raise durability performance reliability on these days. Driving tests were carried out in the PG of KATECH after many sensors were attached in the vehicle. As driving tests result, wheel load, strain of suspension parts and car acceleration data were measured. The acquired data was used to make a driving signal of half road simulator by iteration process. Instead of wheel force transducer(WFT), only dummy wheel adapter has been installed to execute durability test generally. This results the inertia difference from the weight difference. Durability test was executed after additional dummy wheel adapter was installed to compensate this phenomenon. A comparison of strain history, frequency and local strain rate was made between the only dummy wheel adapter installation condition and additional dummy wheel adapter installation condition. As result, the mass effect of dummy wheel adapter was analyzed. And spring displacement and velocity were also analyzed to comprehend vertical behavior characteristic of suspension system on the only dummy wheel adapter installation condition over against additional dummy wheel adapter installation condition.
잔류응력을 고려한 Lower Control Arm의 내구해석
최보원(Bowon Choi),강우종(Woojong Kang),고웅희(Woonghee Ko),김기훈(Gihoon Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Fatigue life prediction of a lower control arm is carried out with finite element methods. The lower control arm has heat effected zone induced from a seam welding process. The residual stresses generated in the zone are measured by a x-ray stress analyzing equipment. Since the residual stress has much effects on the fatigue life, the residual stress is considered in the fatigue life prediction process as mean stresses with relaxation effect. The heat transfer and a thermal elasto-plastic analyses are performed and verified with measured residual stress value. The fatigue life predicted by simulations are compared with test results.