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용접시편 응력-수명 선도를 이용한 샤시부품의 내구수명 평가
신헌(Hun Shin),구자석(Jasuk Koo),최승렬(Seungryul Choi),안병재(Byungjae Ahn),이희청(Heechung Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Automotive chassis parts are commonly fabricated by arc welding. Severe stress concentration and low fatigue strength tend to cause fatigue crack near the weld. Thus, fatigue life estimation of the weld is very important for the durability of the chassis parts. This study presents a method for estimating the fatigue life of the weld. The fatigue life for 10 kinds of weld specimens is measured by fatigue test and structural stress at the weld is calculated by finite element analysis. The stress life curve of the weld is obtained by statistical analysis of the fatigue life and structural stress. Using the stress-life curve for the weld, fatigue life estimation of a front lower control arm is carried out by finite element analysis. The fatigue life estimated by simulation is compared with test results. It is found that the proposed stress-life curve of the weld provide a good estimation of fatigue life.
설계 인자 영향도 분석을 통한 자동차용 스틸 휠의 동적 선회 내구 성능 육성 연구
신헌(Hun Shin),구자석(Ja Suk Koo),진재걸(Jae Gul Jin),강창존(Chang Jon Kang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In automotive engineering, road wheels are critical components to support total vehicle weight. In order to prevent fatigue failure of the wheel working under severe cyclic loading, it is necessary to estimate the fatigue life and improve the fatigue strength. Conventional drop center wheels made of steel are widely used in the automotive industry by providing significant weight and cost savings. But it is difficult to achieve required fatigue strength for the wheel with restrictions on the weight which are becoming strong for the OEM’s. This paper describes the stress calculation in the disc hat by simulating the cornering fatigue test which is one of the traditional durability tests for the wheel prototype verification using finite-element analysis. To investigate the disc design aspects of the fatigue strength, the parametric study of the disc design parameters influencing on the cornering fatigue strength of the wheel was carried out by design of experiments. Based on the results, models for durability improvement and weight reduction were proposed.
샤시모듈 부품 용접부 피로특성 평가 및 내구수명 상관성 연구
이희청(Heechung Lee),이우식(Woosik Lee),신헌(Shin Hun),전용(Yong Chun) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Evaluation of fatigue strength on the welded part is very important for strength design of welded steel structures. Arc -welds has been used for chassis parts. The arc-welds for chassis parts are exposed under higher stress, compared with other parts, and thus tend to cause fatigue failure. This study presents a method for determining the fatigue life of arc-welds used extensively in chassis parts. The specimens were machined for the tensile and fatigue tests. The tensile and fatigue strengths were measured. Fatigue data must be insured according to the shapes, materials, and welding conditions of the arcwelded structure. This study proposes a method for estimating the fatigue life of arc-welds, and compares test results with calculated ones. Fatigue life prediction of a lower control arm is carried out with finite element methods. The fatigue life predicted by simulations are compared with test results.