Ductile fracture behavior of 5052 aluminum alloy sheet under cyclic plastic deformation at room temperature |
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| Authors: | T Yagami K Manabe T Miyamoto |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Maragheh, Maragheh, Iran;2. Department of Engineering, Mahabad Branch, Islamic Azad University, Mahabad, Iran;1. Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran;2. Department of Materials Science and Engineering, Sahand University of Technology, Tabriz, Iran;3. Department of Mechanical Engineering, Prince Mohammad Bin Fahd University, Al Khobar 31952, Saudi Arabia;4. School of Denizli Vocational Technology, Program of Machine, Pamukkale University, Denizli, Turkey;5. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea;1. Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, P.O. Box 55136-533, Maragheh, Iran;2. Department of Materials Science and Engineering, Imam Khomeini International University (IKIU), Qazvin, Iran;3. School of Denizli Vocational Technology, Program of Machine, Pamukkale University, Denizli, Turkey;4. Department of Engineering, Mahabad Branch, Islamic Azad University, Mahabad, Iran;1. Department of Pediatric Orthopaedics, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China;2. School of Denizli Vocational Technology, Program of Machine, Pamukkale University, Denizli, Turkey;3. Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran;4. National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China |
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| Abstract: | Ductile fracture behavior of a 5052 aluminum alloy sheet undergoing cyclic plastic deformation is investigated in order to clarify the effect of cyclic plastic deformation on formability enhancement in incremental stretch sheet forming at room temperature. In the incremental forming, formability markedly increases owing to strain distribution and accumulation effects. The former effect is activated when the deformation region expands along tool paths. Thus, localization of deformation, which leads to necking or fracturing, can be prevented. On the other hand, local strain is accumulated without fracturing when a blank sheet is repeatedly subjected to out-of-plane deformation at the same position. In this paper, the effect of the strain accumulation due to cyclic deformation generated by bending and unbending is primarily focused on to discuss the effect on deformability. To apply cyclic plastic straining to the specimen, a cyclic stretch-bending test was adopted. A cyclic tensile test was also conducted for larger bending curvature. The experimental results show that cyclic bending–unbending affects the ductility of sheet metals. The fractography obtained by scanning electric microscopy also indicates that fewer and smaller voids are observed particularly on bending the inner side than on the outer side. |
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