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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
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- 학위논문
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- 2014
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A self-piercing rivet(SPR) is a mechanical component for joining dissimilar materials. It is used for joining dissimilar material sheets such as aluminum alloy and steel. The self-piercing rivet directly pierces into sheets without hole of sheets beforehand unlike conventional rivets.
Due to large difference between melting points of a steel and aluminum alloy, conventional resistance spot welding is not utilized for this joining. Thus, the self-piercing rivet is needed for joining dissimilar materials. However, the self-piercing rivet occurs buckling when piercing high strength steel. Therefore, a helical SPR which can pierce high strength steel sheet was designed.
In this thesis, joining process of the helical SPR and forging process were simulated by using commercial FEM code DEFORM-3D. High tensile strength steel sheets different strengths were joined with an aluminium alloy sheet by the helical SPR. Moreover, forging process was designed for manufacturing the helical SPR. Shape of the helical SPR was modified by comparing simulated results.
In the simulation of forging process for manufacturing rivet, process sequence, formability, forging load were investigated. The suitable forging process could be designed by comparisons of simulated results.
Experimental trials have been carried out for same conditions as simulated ones. The simulated results were agreed with the experimental ones. As a result, the helical SPR which can pierce high strength steel sheet was optimally designed.
The helical self-pierce riveting is effective in combining high strength steel and aluminum alloy sheets in automobile parts.
Due to large difference between melting points of a steel and aluminum alloy, conventional resistance spot welding is not utilized for this joining. Thus, the self-piercing rivet is needed for joining dissimilar materials. However, the self-piercing rivet occurs buckling when piercing high strength steel. Therefore, a helical SPR which can pierce high strength steel sheet was designed.
In this thesis, joining process of the helical SPR and forging process were simulated by using commercial FEM code DEFORM-3D. High tensile strength steel sheets different strengths were joined with an aluminium alloy sheet by the helical SPR. Moreover, forging process was designed for manufacturing the helical SPR. Shape of the helical SPR was modified by comparing simulated results.
In the simulation of forging process for manufacturing rivet, process sequence, formability, forging load were investigated. The suitable forging process could be designed by comparisons of simulated results.
Experimental trials have been carried out for same conditions as simulated ones. The simulated results were agreed with the experimental ones. As a result, the helical SPR which can pierce high strength steel sheet was optimally designed.
The helical self-pierce riveting is effective in combining high strength steel and aluminum alloy sheets in automobile parts.
목차
Ⅰ. 서 론 11.1 연구배경 11.2 연구동향 31.3 연구목적 및 내용 4Ⅱ. 이론적 배경 72.1 강소성 유한요소법의 개요 72.2 강소성 유한요소법의 수식화 92.3 공정설계를 위한 규칙 12Ⅲ. SPR 접합 유한요소해석 143.1 SPR 모델링 143.2 판재의 접합조건 143.3 리벳과 판재의 소재물성 153.4 해석 경계조건 163.5 유한요소해석 결과 17Ⅳ. SPR 단조 유한요소해석 184.1 냉간 단조 공정설계 184.2 해석 모델링 및 소재물성 184.3 해석 경계조건 194.4 해석 방법 224.5 단조 공정 해석 224.6 단조 공정 실험 21Ⅴ. SPR 재설계 235.1 SPR 모델링 235.2 단조 유한요소해석 및 실험 235.3 접합 유한요소해석 결과 245.4 판재 접합 및 전단실험 26Ⅵ. 결 론 31참고문헌 33FIGURES 35TABLES 59
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