Volume 23, Issue 6 (June 2023)
Modares Mechanical Engineering 2023, 23(6): 367-378 |
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Amini A, Alavi Nia َ. Experimental and numerical investigation of tensile properties and formability of St14 steel sheet at medium strain rate via impact forming. Modares Mechanical Engineering 2023; 23 (6) :367-378
URL: http://mme.modares.ac.ir/article-15-67691-en.html
URL: http://mme.modares.ac.ir/article-15-67691-en.html
1- Department of Mechanical Engineering, Bu-Ali Sina University, Hamedan, Iran
2- Department of Mechanical Engineering, Bu-Ali Sina University, Hamedan, Iran ,alavi495@basu.ac.ir
2- Department of Mechanical Engineering, Bu-Ali Sina University, Hamedan, Iran ,
Abstract: (1801 Views)
Considering the increasing use of high-speed presses, such as high-speed servo presses, in the automotive industry, it seems necessary to investigate the formability of sheet metals in this range of forming speed. Therefore, this study has been conducted to investigate the effect of medium strain rate forming on the formability of the St14 steel sheet. Tensile tests were done at various strain rates, and formability tests were performed to create forming limit curves at the quasi-static and impact forming. Finite element simulation was used to extract the numerical forming limit curves. The material model was entered into the simulation by considering the strain rate effect using the VUHARD subroutine. The results of tensile tests showed that some influential strain-hardening indicators reduce with strain rate enhancement. Also, using the material model, the tensile behavior was predicted with good accuracy at each strain rate. In impact forming, fracture and strain concentration was transferred to the dome center, and the dome height in biaxial stretching was reduced by 17.1% compared to quasi-static forming due to the variation of frictional conditions. The forming limit curve of impact forming was shifted to the lower values and right side of the forming limit diagram compared to quasi-static forming. In impact forming, the forming limit in plane-strain condition was reduced by 8.1% compared to quasi-static forming. Also, the simulation results, including fracture position, forming limit curve, and dome height in both forming processes, were in good agreement with the experimental results.
Keywords: Tensile properties, Formability, Forming limit curve, Medium strain rate, Impact forming, St14 steel
Article Type: Original Research |
Subject:
Forming of metal sheets
Received: 2023/02/23 | Accepted: 2023/05/8 | Published: 2023/05/31
Received: 2023/02/23 | Accepted: 2023/05/8 | Published: 2023/05/31
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