吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (5): 1527-1533.doi: 10.13229/j.cnki.jdxbgxb201705026

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Experiment on formability of aluminum alloy sheet under three dimensional stress state

LANG Li-hui, KAN Peng, WANG Yao, SUN Zhi-ying, ZHANG Quan-da   

  1. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
  • Received:2016-05-23 Online:2017-09-20 Published:2017-09-20

Abstract: An experiment study on the flow characteristics of aluminum alloy 2B06 sheet under normal stress is carried out on the basis of the elliptical hydraulic bulging. The equivalent stress-strain curves of the target sheet are obtained by the ellipse bulging experiment with different ratio of the length semi-major to semi minor,b/a; meanwhile, the material and the thickness of the overlapping sheet are varied. The results show that, when nicking occurs, the equivalent stress-strain curve of the target sheet can achieve greater strain under the action of overlapping sheet. With the decrease in b/a, the flow stress curves tend move away from the curve obtained by circular (b/a=1) bulging test. At the same time, the larger strength coefficient of overlapping sheet, larger hardening exponent and larger thickness of the overlapping sheet lead the thickness of the target sheet more uniform. Proper overlapping sheet can significantly improve the flow characteristics of the target sheet.

Key words: machine manufacturing technology and equipment, flow characteristics, overlapping sheet, elliptical bulge, thickness normal stress

CLC Number: 

  • TG115.5
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