摘要： 2-D computer simulation of gas-forming process for the small size specimen with 3rd kind pre-form. The explicit code 2-D LS-DYNA may be used to accurately model the wrinkling occurrence and sites of aluminum sheet during superplastic forming. The power law equation can be used as a constitutive model for superplastic forming. •Sequential processes consisting of hot bending and gas forming of aluminum sheet leads to form a deep V-trough with wavy bottom.•A right contour of the hot bent preform is required in obtaining the product without unwanted wrikle site.•The accetable thickness distribution in the product is dictated by the depth of the hot bent preform. When the amount of stretching strain exceeds material's intrinsic capability in gas forming a complex shape metallic sheet, gas pressurization operation can fail due to sheet material's perforation. A hot-bent assisted gas forming method for shaping a long V-trough with deep bottom of longitudinal wavy shape is proposed for obtaining the product with harmless wrinkle and relatively uniform thickness. This method consists of three sequential actions—an instant hot V-shape bending together with die closing followed by controlled pressurized gas blowing for a period of time. For this method, the depth of hot bending is varied as a parameter to generate pre-forms bearing various contours which consequently determine wrinkling situation in the subsequent gas forming product. Two groups of specimens differing in sheet size are adopted. Regular AA5052 (coarsely grained) and superplastic grade AA5083 (fine grained) alloys are used for experimental works. 出版者： Dearborn: Elsevier Ltd 出版日期： 2016-01 出處： Journal of manufacturing processes, 2016-01, Vol.21, p.101-106 版權： 2015 The Society of Manufacturing Engineers 版權： Copyright Society of Manufacturing Engineers (publishers) Jan 2016 識別號： ISSN: 1526-6125 識別號： EISSN: 2212-4616 識別號： DOI: 10.1016/j.jmapro.2015.12.001
