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A numerical study on establishing the forming limit curve and indicating the formability of complex shape in incremental sheet forming process

Authors
  • Nguyen, Duc-Toan1, 2
  • Kim, Young-Suk3
  • 1 Hanoi University of Science and Technology, School of Mechanical Engineering, 1A-Dai Co Viet Street, Hai Ba Trung District, Hanoi City, Vietnam , Hanoi City (Vietnam)
  • 2 Hungyen University of Technology and Education, Department of Mechanical Engineering, Hungyen, Vietnam , Hungyen (Vietnam)
  • 3 Kyungpook National University, Department of Mechanical Engineering, 1370 Sangyeok, Buk-ku, Daegu, 702-701, Korea , Daegu (South Korea)
Type
Published Article
Journal
International Journal of Precision Engineering and Manufacturing
Publisher
Springer Berlin Heidelberg
Publication Date
Dec 04, 2013
Volume
14
Issue
12
Pages
2087–2093
Identifiers
DOI: 10.1007/s12541-013-0283-8
Source
Springer Nature
Keywords
License
Yellow

Abstract

In order to obtain a final sound product by the incremental sheet forming (ISF) process for complex shape using cold rolled steel material, the limit curve based on the maximum wall angle versus maximum deformed height was established utilizing finite element method (FEM) simulations for several square shapes with various wall angles. The forming limit diagram (FLD) obtained from modified maximum force criterion (MMFC) was first used to predict ductile fracture of ISF simulation test and shown the inaccuracy when comparing with corresponding experimental results. The FLC at fracture (FLCF) curve regarding to tool dimension effects was then proposed, inputted to FEM simulation and approved in good agreement with experiment results. After that wall angle of square shapes was changed to verify its effect on fracture height of the square shapes and obtain the forming limit curve. Finally, wall angles with corresponding maximum deformed height of complex shapes were put into the obtained forming limit to investigate “fail” or “safe” shapes and validated by corresponding experiments.

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