소성∙가공 (Transactions of Materials Processing)

  • 제14권6호
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  • Pages.514-519
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  • 2005
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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액압성형 시험을 통한 알루미늄 튜브 재료의 성형한계도

Forming Limit Diagram of an Aluminum Tube Through Hydroforming Tests

  • 김정선 (강원대학교 대학원 기계 메카트로닉스공학과) ;
  • 이진규 (강원대학교 대학원 기계 메카트로닉스공학과) ;
  • 박종연 (인천기능대학 컴퓨터응용금형과) ;
  • 이동재 (㈜오스템 기술연구소) ;
  • 김헌영 (강원대학교 기계 메카트로닉스공학부) ;
  • 김형종 (강원대학교 기계 메카트로닉스공학부)
  • 발행 : 2005.09.01
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초록

A tube hydroformability testing system was designed and fabricated enabling to apply the forming condition along arbitrarily pre-programmed internal pressure-axial feed path. The free-bulging and T-forming tests were carried out on the extruded aluminum (A6063) tube specimens with 40.6 mm outer diameter and 2.25 mm thickness. Nine different combinations of internal pressure and axial feed, yielding different strain paths from one another, were taken into consideration in order to induce bursting at various deformation modes. Major and minor strains were automatically measured from deformed grids around the fracture using a stereo-vision-based surface strain measurement system, named ASIAS. The forming limit diagram of the A6063 tube material was successfully obtained. Most of the data points acquired from free bulging and T-forming tests appeared in the range of negative minor strain on the FLD and are mostly located near the strain paths calculated from explicit finite element simulations. The forming limit obtained from tests after pre-tension was considerably lower than that from tests without pre-tension, which showed the strain path-dependency of the forming limit as well known in the sheet forming fold.

키워드

참고문헌

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피인용 문헌

  1. Investigation of Cracking Condition during Press Forming of Extruded Aluminum Sheets vol.38, pp.3, 2014, https://doi.org/10.3795/KSME-A.2014.38.3.251
  2. Optimization of the loading path for the tube-hydroforming process vol.230, pp.12, 2016, https://doi.org/10.1177/0954407015618051