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안희태,김태완,유은종 한국지진공학회 2023 한국지진공학회논문집 Vol.27 No.1
The column-tree type steel beam-column connections are commonly used in East Asian countries, including Korea. The welding detail between the stub beam and column is similar to the WUF-W connection; thus, it can be expected to have sufficient seismic performance. However, previous experimental studies indicate that premature slip occurs at the friction joints between the stub and link beams. In this study, for the accurate seismic performance evaluation of column-tree type moment connections, a moment-slip model was proposed by investigating the previous test results. As a result, it was found that the initial slip occurred at about 25% of the design slip moment strength, and the amount of slip was about 0.15%. Also, by comparing the analysis results from models with and without the slip element, the influence of slip on the performance of overall beam-column connections was examined. As the panel zone became weaker, the contribution of slip on overall deformation became greater, and the shear demand for the panel zone was reduced.
안희태(Heetae Ahn),채홍윤(Hongyun Chae),이계호(Kyeho Lee),김진성(Jinsung Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In the automotive industry, TWB method is a main solution to reduce weight of the vehicle and improve fuel efficiency. It is possible that different strength and thickness steel panel are bonded using TWB. It can reduce the weight and increase the strength of the required area. In the study, TWB method is applied to the cross member of suspension. Each Upper panel and lower panel is designed as the unified type. And we can verify the fatigue endurance of the cross member sample with TWB applied using chassis module endurance test.
이종재 알루미늄 및 고장력강의 기계적 접합부에 대한 접합 성능 연구
안희태(Heetae Ahn),최병철(Byungchul Choi),박지형(Jihyung Park) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In order to improve fuel efficiency, the global automobile and parts industry is developing with a focus on the weighting of vehicles by upgrading various component technologies such as application of lightweight materials and development of new bonding technologies. In particular, the lightening of vehicles is becoming more essential to design and manufacture future electric vehicles. Appropriate selection of joining techniques for dissimilar material connections in the replacement of aluminium from steel parts for lightening should be considered of great importance in terms of vehicle productivity and safety. In this study, the joint strength according to the joining conditions, such as adhesion application, was assessed by applying FDS (Flow Drill Screw) and blind rivets as a mechanical joining method for aluminum and high strength steel. The joint strength was also verified by comparison with comparison with the experimental results through FE analysis.
T-joint 필렛 용접 형상 및 하중 방향에 따른 피로 특성 연구
안희태(Heetae Ahn),채홍윤(Hongyun Chae),최돈현(Donhyun Choi),오창영(Chang-Young Oh),이진호(Jin-Ho Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Welding is widely used in the automobile industry, but suspension parts are exposed to various load conditions and are vulnerable to fatigue damage in the welding part. Durability problems occur in areas where gas metal arc welding of subframes and arms is applied. In this study, the fatigue characteristics depending on the shape of weld and the load direction were analyzed through specimen tests for the T-joint fillet welding structure. The fatigue limit load was compared 300,000 cycles times for each load condition of the welding part in the tensile, shear, and ± bending directions. A method for robust design depending on the load direction designing suspension parts was identified. And the durability of the double-sided welding in T-fillet joints was compared with the single-sided welding.