http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Quoc-Tuan Pham(팜콕투완) (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
Quoc-Tuan Pham(팜콕투완),Jin-Jae Kim(김진재),Young-Suk Kim(김영석),Seong-Jin Kwon(권성진) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Unixaial tensile test is the most common method used to identify the mechanical characteristics for sheet materials. However, several sheet forming processes lead to large plastic deformation in which the plastic strain is over the maximum uniform elongation of uniaxial tensile test, for instance, clinch forming, hydroforming, stamping and deep drawing. Therefore, post-necking behavior of sheet materials is a currently attractive research topic where these studies focus on the behavior of metals beyond the uniaxial tensile elongation. This study aims to determine the flow curves and yield locus of aluminum 5052 sheets by performing the hydraulic bulge test and uniaxial tensile tests. To obtain this goal, firstly, a series of uniaxial tensile tests are performed in order to evaluate the yield stress and anisotropic plasticity coefficients in three orientations 0°, 45° and 90° respect to the rolling direction. Secondly, the hydraulic bulge test is carried out to achieve biaxial stress-strain curve. From this curve, biaxial yield stress and biaxial anisotropic plasticity coefficients are derived. Moreover, a new strain hardening function is proposed to perfectly describe stress-strain relation of studied material in term of uniaxial tensile test and predict the post-necking behavior of this material. The biaxial stress-strain curve is transformed into an effective stressstrain curve, then this curve is compared with the fitting results of new strain hardening function in rolling direction to highlight the accuracy of post-necking prediction of proposed equation. Thirdly, the parameters of Yld2000 yield function are derived from above-mentioned mechanical properties to describe yield locus of aluminum 5052 sheets. Finally, the achieved effective stress-strain curve and yield locus are imported into a FE analysis code to simulate the hydraulic bulge test of this material. The simulation results match well with the experiment records and it is reasonable to conclude that the novel approach to determine the mechanical characteristics achieved from this study can be applied for other sheet materials.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
