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박진기(J. G. Park),안덕찬(D. C. Ahn),남재복(J. B. Nam),김영석(Y. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
This paper includes a review of biaxial tensile test equipment and specimen. Biaxial testing of metal is becoming prevalent in sheet metal industry to evaluate mechanical properties for tested materials. Because light and high strength materials as aluminum, magnesium, titanium, and ultra high strength steel are largely anisotropic, biaxial tensile test i: used as opposed to the common uniaxial test. Also, the stresses acting on a component in service are generally multi-axial in nature. Therefore, it is necessary to consider the mechanical properties not only under uniaxial stress states but also under these multi-axial states of stress. In this paper, the several kinds of biaxial tensile test were introduced and it: limitation and challenge were discussed.
가변롤성형을 이용한 가변단면을 갖는 프로파일의 변형길이 분석에 관한 연구
박종철(J. C. Park),차명환(M. H. Cha),김돈건(D. G. Kim),남재복(J. B. Nam),양동열(D. Y. Yang) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Needs for profiles with variable cross-sections are increasing to meet industrial applications. Flexible roll forming is capable to fabricate profile with variable cross-sections. Span length which is a distance between each roll stand is important parameter to affect longitudinal strain on flange sections of profiles. And span length needs to be longer than deformation length of profiles during flexible roll forming to reduce unnecessary longitudinal strain on flange sections. In this study, deformation length is investigated. By studying shape parameters of profiles with variable cross-sections, the deformation lengths of profiles during flexible roll forming were analyzed. As radius curvatures and transition angles on transition zones increase, deformation length increases.