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도로하중조건을 고려한 상용차 Leaf Spring의 피로강도 평가
손일선(I.S. Sohn),배동호(B.H. Bae),정원석(W.S. Jung),정원욱(W.W. Jung),박순철(S.C. Park) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Suspension system of vehicle is directly influenced to ride and handling. Therefore, suspension part<br/> should have enough endurance during its lifetime to protect passenger. Spring is one of major<br/> suspension part of vehicle. Thus, in this paper, a fatigue design method for leaf spring based on road<br/> load response is proposed. At first, strain and acceleration of leaf spring is measured on the proving<br/> ground. And next, the maximum load of leaf spring under driving condition was defined from the<br/> road load response. And leaf spring fatigue test and 3 point bending specimen tests were carried out.<br/> From the above, the maximum load-fatigue life relation of leaf spring was defined, and test results<br/> have good agreement between 3 point bending test result and leaf spring fatigue test. It is expect that<br/> 3 point bending test can verify leaf spring fatigue endurance as well as saving time and cost.
쇼트피닝 잔류응력이 Leaf Spring의 피로강도에 미치는 영향
배동호(B. H. Bae),손일선(I. S. Sohn),정원석(W. S. Jung),김낙수(N. S. Kim),정원욱(W. W. Jung),박순철(S. C. Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Spring is one of major suspension pan of vehicle. Thus, in the process of manufacturing, it is shot-peened to improve its fatigue strength. In this paper, residual stresses by shot peening were calculated through finite element analysis, and the effects of these residual stresses on fatigue strength of leaf spring were evaluated. Fatigue tests were performed with two kinds of specimens, one is actual leaf spring assembly, and another is 3-point bending specimen simply simulated. And all fatigue tests were also performed under the loading condition that was measured on the proving ground. From the results, the maximum load-fatigue life relation of leaf spring was defined, and test results have good agreement between 3 point bending specimen and leaf spring assembly. The effects of residual stresses by shot peening on fatigue strength of leaf spring is not large in the high load range, however, in the low load range, its effects were revealed a little.<br/> <br/>