中南大学学报（自然科学版）2017，Vol.48Issue(5)：1149-1154,6.DOI:10.11817/j.issn.1672-7207.2017.05.004
铝合金覆层板成形极限图
FLDs of aluminum alloy by overlapping sheet metal
摘要
Abstract
A novel experimental approach to research the forming limit diagrams (FLDs) of aluminum alloy by overlapping sheet metal was presented, namely, the tension-compression side of the FLD was obtained by the uniaxial tension test. The limit strains of tension-tension side for the aluminum alloy by overlapping sheet metal were obtained by elliptical bulging test with different aspect ratios. In addition, the experimental data of YBT test were introduced into the FLD to predict the wrinkling defect in the sheet forming, in which the predictive features of FLDs were more improved. Meanwhile, the influence of the material performance and thickness of the overlapping sheet on the FLD of the target sheet were further investigated. The results show that, in the overlapping mode, the limit critical zone of FLD of the target sheet moves up and to the right, the forming limit increases and the area of wrinkling region decreases, and the anti-instability of the target sheet is improved correspondingly. Meanwhile, the formability of the target sheet can be improved by choosing higher strength coefficientK, larger work hardening exponentn and proper thickness of the overlapping sheet.关键词
铝合金/覆层板/厚度法向应力/成形极限图/椭圆胀形/方板对角拉伸试验Key words
aluminum alloy/overlapping sheet/thickness normal stress/forming limit diagram (FLD)/elliptical bulge/Yoshida bucking test分类
矿业与冶金引用本文复制引用
王耀,郎利辉,孔德帅,张泉达,高铁军..铝合金覆层板成形极限图[J].中南大学学报（自然科学版）,2017,48(5):1149-1154,6.基金项目
国家科技重大专项(2014ZX04002041) （2014ZX04002041）
国家自然科学基金资助项目(51175024) (Project(2014ZX04002041) supported by the National Science and Technology Major Project （51175024）
Project(51175024) supported by the National Natural Science Foundation of China) （51175024）
