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차체경량화를 위한 고강도 강판의 점 용접성과 피로강도 평가
배동호(Dongho Bae),손일선(Ilseon Sohn),정원석(Wonseok Jung),허정범(Jeongbeom Heo),권순용(Soonyong Kwon),윤치상(Chisang Yoon) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The recent tendency in the automobile industries is toward light weighting vehicle body to improve the problems by environmental pollution as well as improving fuel cost. The effective way to reduce the weight of vehicle body seems to be application of new materials for body structure, and such trend is remarkable. Among the various materials for vehicle body, stainless steel sheets and cold rolled steel sheets are under the interests. However, in order to guarantee reliability of new material and to establish the long life fatigue design criteria of body structure, it is necessary to assess spot weldability and fatigue strength of spot welded lap joints fabricated under optimized spot welding condition. In this paper, spot weldability of the stainless steel sheets, STS301L and STS304L, and the cold rolled steel sheets, SPCC and SPCD. Fatigue strength of lap joints spot -welded between similar and dissimilar materials were also assessed.
배동호(DongHo Bae),백승엽(Sungyup Back),조선영(Sunyoung Cho),박진형(Jinhyung Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
In order to develop a method of corrosion fatigue design and estimate reliability of TMCP steel using as the material of heavy industries and plants, its corrosion susceptibilities, corrosion fatigue strength, and determination of fatigue design criterion considering corrosion degradation were investigated. From the results, the corrosion characteristic of TMCP steel is very susceptible in 3.5wt.% NaCI solution. Its susceptibility was linearly increased with the solution temperature increase. The corrosion fatigue strength in 25℃, 3.5wt.% NaCI solution is very lower than that of in air. And also, it was decreased with the frequency decrease in the same environment. It is expected that the-developed corrosion fatigue design method for TMCP steel is useful. However, it is necessary to verify its reliability for actual application.
최대응력을 이용한 상용차 Leaf spring 의 피로강도 평가
정원석(Wonseok Jung),배동호(Dongho Bae),손일선(Ilseon Sohn),정원욱(Wonwook Jung),박순철(Suncheol Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Suspension system of vehicle is very important part because it acts on ride comport and safety. And the spring is one of major part vehicle. Therefore it has to be designed to operate under severe conditions to ensure enough endurance. In general, the most typical and traditional method for fatigue design methods need many additional fatigue tests according to its geometry, materials, and fatigue loading condition. This indicates that a lot of cost and time for it have to be consumed. In this paper. the ΔP-N_f curve were obtained by fatigue tests. Using these results, ΔP-N_f curves were rearranged in to the Δδ_f relation with the maximum stress. By using the maximum stress and the fatigue data previously obtained as the fatigue test results, the fatigue design criterion could be predicted without any additional fatigue tests.
도로 하중조건을 고려한 상용차 판스프링의 피로설계 기준연구
손일선(Ilseon Sohn),배동호(Dongho Bae),정원석(Wonseok Jung),정원욱(Wonwook Jung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Suspension system of vehicle have enough endurance during its life time to protect passenger. Spring is one of major part of vehicle. Thus, a fatigue strength evaluation for leaf spring based on road load response was carried out. At first, strain of leaf spring is measured on the city condition and proving ground condition. And next, the damage analysis of road load response data was carried out. And fatigue test of leaf spring were also carried out. Based on ε-N life relation, fatigue life of leaf spring was evaluated at belgian mode, city mode and drawing test specification. After that, it is compared the design life of leaf spring and evaluated fatigue life by belgian mode, city mode and drawing test specification. From the above, the maximum load-fatigue life relation of leaf spring was defined by test. and new test target of belgian mode and city mode was proposed to accept design specification of leaf spring. It is expect that proposed test target can verify leaf spring fatigue endurance at specific road condition.
정원석(Jung Wonseok),배동호(Bae Dongho),손일선(Sohn Ilseon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.8
The vehicle suspension system is directly influenced to ride and handling. Therefore, the major components of the vehicle suspension system should have enough fatigue strength during its lifetime to protect passenger from the traffic accident. Spring is one of major suspension part of vehicle. Thus, in this paper, a fatigue design method for leaf spring based on geometric parameter was proposed. At first, it makes the fatigue test of leaf spring. On the base of these data, evaluation of numerical stress analysis for leaf spring assembly were performed. And next, after studying numerically on geometrical parameters of leaf spring assembly, investigated on the development of a fatigue life prediction method using the theory of neural network. An economical prediction method of fatigue design criterion for leaf spring assembly using the theory of artificial neural network was developed and certified its ability. Without performing a lot of additional fatigue test for a long time, fatigue design criterion for a new leaf spring assembly having different geometry can be predicted on the base of the already obtained fatigue data.
이규영(Gyouyoung Lee),배동호(Dongho Bae),박순철(Suncheol Park),정원욱(Wonwook Jung) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Suspension part should have enough endurance during it lifetime to protect passenger. Therefore, the coil spring is one of the major suspension part of an automobile. Corrosion fatigue strength of the coil spring depends on many factors including mechanical and environmental properties. In this paper, residual stresses by shot peening was analyzed using finite element analysis, and evaluated its effect on corrosion fatigue strength.
경량 차체용 고장력 강판의 Spot 용접과 피로설계에 관한 연구
허정범(Jeongbeom Heo),배동호(Dongho Bae),윤치상(Chisang Yoon),권순용(Soonyong Kwon) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The recent tendency in the automobile industries is toward light weighting vehicle body to improve the<br/> problems by environmental pollution as well as improving fuel cost. The effective way to reduce the weight<br/> of vehicle body seems to be application of new materials for body structure and such trend is remarkable.<br/> Among the various materials for vehicle body, stainless steel sheet (for example, 301L and 304L), TRIP steel<br/> and cold rolled steel sheets are under the interests. However, in order to guarantee reliability of new material<br/> and to establish the long life design criteria of body structure, it is important and require condition to assess<br/> spot weldability of them and fatigue strength of spot welded lap joints which were fabricated under optimized<br/> spot welding condition. And, recently, a new issue in the design of the spot welded structure is to predict<br/> economically fatigue design criterion without additional fatigue tests. In general, for fatigue design of the<br/> spot-welded thin sheet structure, additional fatigue tests according to the welding condition, material, joint<br/> type, and fatigue loading condition are generally required. This indicates that much cost and time for it should<br/> be consumed. Therefore, in this paper, the maximum stresses at nugget edge of spot weld were calculated<br/> through nonlinear finite element analysis first. And next, obtained the f N P . . relation through the actual<br/> fatigue tests on spot welded lap joints of similar and dissimilar high strength steel sheets. And then, the<br/> relation was rearranged in the Δ f N P . . σ- N f relation. From this Δ σ - N f relation, developed the<br/> fatigue design technology for spot welded lap joints of them welded using the optimized welding conditions.
STS301L 가스용접이음재의 가속수명예측 기법 (1.Fillet type)
백승엽(Seungyeb baek),배동호(Dongho Bae) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
stainless steel sheets are widely used as the structural material for the railroad cars and the commercial vehicles. These kinds structures used stainless steel sheets are commonly fabricated by using the gas welding, For fatigue design of gas welded joints such as fillet type joint. It is necessary to obtain design information on stress distribution at the weldment as well as fatigue strength of gas welded joints. And also, the influence of the geometrical parameters of gas welded joints on stress distribution and fatigue strength must be evaluated. Thus, in this paper, ΔP-Nf curves were obtained by fatigue tests. and, ΔP-Nf curves were rearranged in the Δσ-Nf relation with the hot spot stresses at the gas welded joints. Using these results, the accelerated life test(ALT) is conducted. From the experiment results, an acceleration model is derived and factors are estimated. So it is intended to obtain the useful information for the fatigue lifetime of fillet welded joints and data analysis by statistic reliability method , to save time and cost, and to develop optimum accelerated life prediction plans.