The analysis of void growth that leads to central bursts during extrusion |
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| Affiliation: | 1. Department of Mechanical Engineering, Karpagam College of Engineering, 641032, India;2. Karpagam College of Engineering, 641032, India;3. Department of Mechanical Engineering, P.A. College of Engineering and Technology, Coimbatore 642 002, India;1. Department of Forensic Sciences, University of Health Sciences, Lahore, Pakistan;2. Department of Forensic Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea;3. Forensic DNA Laboratory, Center for Applied Molecular Biology, University of Punjab, Lahore, Pakistan;4. Molecular Biology and Genetics Department, Medical Research Center, Liaquat University of Medical and Health Sciences, Jamshoro, Pakistan;5. Department of Forensic Genetics, School of Forensic Medicine, China Medical University, Shenyang, China;1. Université de Lyon, INSA-Lyon, MATEIS CNRS UMR5510, 7 Avenue Jean Capelle, 69621 Villeurbanne, France;2. Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Service de chirurgie Orthopédique et Traumatologique, 69495 Pierre-Bénite cedex, France;3. Université de Lyon, Université Claude Bernard Lyon 1, MATEIS CNRS UMR5510, 8 avenue Rockefeller, 69373 Lyon Cedex 08, France;1. Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, 98 Brett Rd, Piscataway, NJ, 08854, USA;2. Skolkovo Institute of Technology, Moscow,143005, Russia;1. Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada;2. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada |
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| Abstract: | Using large deformation finite element analysis together with Gurson's constitutive model, we have studied the behavior of microvoids nucleated at second phase particles during direct axisymmetric extrusion. Two different die-designs were analyzed. Experiments show that the first die-design results in central burst formation while the second gives a solid product free of central bursts. Comparison of the stress fields of the two die-designs provides a possible explanation of how central bursting initiates and why it appears after several steps of multi-step extrusions. The finite element results are in agreement with experimental observation and show that the finite element method can be successfully used to predict the formation of central bursts during extrusion. |
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