Volume 19, Issue 2 (2019)                   Modares Mechanical Engineering 2019, 19(2): 269-280 | Back to browse issues page

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Honarpisheh M, Tavajjohi M, Nazari F. Experimental and Numerical Study of Severe Plastic Deformation in the Constrained Groove Pressing Process on the Pure Copper Sheets. Modares Mechanical Engineering. 2019; 19 (2) :269-280
URL: http://mme.modares.ac.ir/article-15-23967-en.html
1- Manufacturing Department, Mechanical Engineering Faculty, University of Kashan, Kashan, Iran , honarpishe@kashanu.ac.ir
2- Manufacturing Department, Mechanical Engineering Faculty, University of Kashan, Kashan, Iran
Abstract:   (10036 Views)
The Constrained Groove Pressing (CGP) process is one of the most effective and newest methods of the severe plastic deformation for production ultrafine-grain metal sheets. In this research, the effect of CGP on the microstructure and mechanical properties of pure copper sheets was investigated. In order to study the microstructure of the samples, the optical microscopy was used, and tensile and Vickers micro-hardness tests were utilized for the evaluation of the mechanical properties. Investigating the microstructure of CGPed sheets determined that the CGP process has caused intense grain refinement, especially at first pass. Also, the results of mechanical properties showed that this process has considerably increased strength and hardness of the copper samples. In the numerical investigation of constrained groove pressing, effective strain and forming force were evaluated, using finite element simulation and the results indicated that with increasing number of CGP passes, effective strain, and forming force increase. Also, distribution of effective strain illustrated that the center of samples are under more effective strain that causes increasing hardness inside the samples be more than increasing hardness of the surface. Finally, a method was presented for estimating the yield strength of material, using the hardness values, and it could calculate the yield stress in different passes of process with an acceptable error of 6%.
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Article Type: Original Research | Subject: Aerospace Structures
Received: 2018/08/10 | Accepted: 2018/10/14 | Published: 2019/02/2

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