Volume 14, Issue 16 (Forth Special Issue 2015)                   Modares Mechanical Engineering 2015, 14(16): 212-222 | Back to browse issues page

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Saradar M, Basti A, Zaeimi M. Numerical study of the effect of strain rate on damage prediction by dynamic forming limit diagram in high velocity sheet metal forming. Modares Mechanical Engineering 2015; 14 (16) :212-222
URL: http://mme.modares.ac.ir/article-15-6409-en.html
Numerical study of the effect of strain rate on damage prediction by dynamic forming limit diagram in high velocity sheet metal forming
Morteza Saradar , Ali Basti * 1, Mohammad Zaeimi
1- Assistant Professor/ University of Guilan
Abstract:   (7101 Views)
In This paper dynamic forming limit diagram has been investigated as fracture criteria for St13 steel. In fact, effect of various strain rates has been studied. This fracture criterion is based on the Marciniak-Kuczynski (M-K) theory and Solutions of equations have been obtained by applying the Newton -Raphson method. After solution three forming limit diagrams has been created: independent strain rate, dependent strain rate and dynamic forming limit diagram. Dynamic damage criteria investigates forming limit diagram in every strain rate. It is observed that the forming limit is increased by increasing the strain rate, Also for considering the anisotropic and the elastic-plastic behavior of material, the Hill 1948 yield criterion and the Swift hardening rule are used respectively. Also this paper is concerned with the uniaxial tensile properties and formability of sheet metal in relation to the strain rate effects. In order to verification of the results several experiments have been done with a Drop Hammer which is a high speed impact machine. For comparison between quasi static and dynamic damage criterions, all of the stages of experiment were simulated in finite element software Abaqus and results are compared together.
Keywords: Strain rate, Forming Limit Diagram, quasi static analysis, anisotropic behavior
Full-Text [PDF 1486 kb]   (12780 Downloads)    
Article Type: Research Article | Subject: Metal Forming
Received: 2014/07/5 | Accepted: 2014/08/18 | Published: 2014/11/8
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