지원사업
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
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 조해용
- 발행연도
- 2017
- 저작권
- 충북대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
오류제보하기
Pipe expansion, which is one of the pipe end-forming processes, means elimination of diameter differences between two pipe ends by increasing the diameter. In order to be expanded, the pipe has been mainly forced by mandrel or punch. This mechanical method is suitable for auto parts industry due to high productivity and low cost of production. And the mechanical method of expanding process is appropriate for the pretensioner pipe as an automotive part.
In this thesis, a upper bound method has been used to analyze pipe expanding process and design dies for the pretensioner pipe. A kinematically admissible velocity field has been newly derived, where in, reduced thickness of the expended pipe has been considered to represent actual pipe expanding process. The internal energy and the energy dissipated on frictional and velocity discontinuity surfaces has been optimized with respect to the semi-cone angle of punches. Comparisons of upper bound analysis and FEM results were in good agreement with experimental trials and conclude as follows;
1. A kinematically admissible velocity field has been newly derived, where in, reduced thickness of the expended pipe has been considered. It should be useful for expanding or sinking of pipes.
2. The upper bound alanysis and FEM results are in good agreement. It is desirable that the semi-cone angle of expanding punch is 15° to 20° in the pipe expanding process.
3. The experimental results are in good agreement with the upper bound analysis and FEM ones. The upper bound analysis in this thesis would be useful to design the pipe expanding process.
In this thesis, a upper bound method has been used to analyze pipe expanding process and design dies for the pretensioner pipe. A kinematically admissible velocity field has been newly derived, where in, reduced thickness of the expended pipe has been considered to represent actual pipe expanding process. The internal energy and the energy dissipated on frictional and velocity discontinuity surfaces has been optimized with respect to the semi-cone angle of punches. Comparisons of upper bound analysis and FEM results were in good agreement with experimental trials and conclude as follows;
1. A kinematically admissible velocity field has been newly derived, where in, reduced thickness of the expended pipe has been considered. It should be useful for expanding or sinking of pipes.
2. The upper bound alanysis and FEM results are in good agreement. It is desirable that the semi-cone angle of expanding punch is 15° to 20° in the pipe expanding process.
3. The experimental results are in good agreement with the upper bound analysis and FEM ones. The upper bound analysis in this thesis would be useful to design the pipe expanding process.
목차
Ⅰ. 서론 11.1 연구배경 11.2 연구동향 31.3 연구목적 4Ⅱ. 이론적 배경 62.1 상계법 62.2 유한요소법 8Ⅲ. 결과 및 고찰 103.1 상계해석 103.1.1 형상함수 103.1.2 동적가용속도장 113.1.3 에너지소비율 계산 133.2 유한요소해석 153.2.1 펀치반각 선정 163.2.2 확관공정 해석 173.2 확관 실험 183.3.1 성형하중 비교분석 183.3.2 확관부의 단면형상 비교분석 20Ⅳ. 결론 22참고문헌 24
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