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RISS 인기검색어
- 검색키워드
- 저자 : Ali Adelkhani (검색결과 2 건)
- 무료
- 기관 내 무료
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Ali Adelkhani 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11
Considering the fact that the most of the human equipment developed by forming processes, one of the methods of producing these materials is through the metal forming process. In Industrial process, prediction of the final dimension of the part after unloading is an essential problem. Thickness distribution is the geometric change made to a part at the end of the forming process when the part has been released from the forces of the forming tool. In this study, the effects of grain size and sheet thickness on the formability of annealed copper sheets in the deep drawing process were studied. To this end, the effect of friction coefficient was evaluated for a total of 64 different cases by the finite element method (FEM). The effect of optimal parameters and grain size on the maximum deep drawing height (DDH) and thickness distribution of the square part was investigated. According to the literature review, punch and die radii uses were spotted. Based on the simulation software, the best thickness distribution was obtained in no-friction force between tools. According to the experimental results, as the grain size increased from 33 to 161 µm and from 25 to 158 µm, the thickness of wall and bottom specimens was increased, and the corner was decreased.
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Ali Adelkhani,Hadi Ebrahimi,Mohammad Mahdi Attar 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.1
Performed was a set of experimental tests to scrutinize the effect of the welding angle and material properties on the spring-back and the displacement as well as the amount of required load in the standard bending test according to ASTM B820-18 with some numerical simulation conducting to compare those results and calculate stress through the bending process. The applied sheets were made of Copper, Aluminum and St12, DIN1623 with a thickness of 1 mm. In this study, prepared is a welding line at three angles, 30 0 , 45 0 and 90 0 whilst two punch’s radiuses have been considered. Additionally, three orientations 0 0 , 45 0 and 90 0 have been considered to check the homogeneity of the plate. Added to this, a numerical analysis utilizing finite element methods was conducted to validate the results obtained from the experimental tests. based on results, there wasn’t seen any considerable difference (less than 10 %) in terms of un-homogeneity in results while the minimum springback pressure for the St12-Cu sheet was equal to 3.6, and measured 3.70 for St12-Al. In the numerical solution, the maximum stress for the welding angle, 30, in St12-Al sheet was 305 MPa with the springback decreasing from 0.1 to 0.5 whenever the pitch radius changing from 5 to 10 mm.
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