Analysis of the extended stress-based forming limit curve considering the effects of strain path and through-thickness normal stress |
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| Affiliation: | 1. Faculty of Mechanical Engineering, KN Toosi University of Technology, P.O. Box 19395-1999, Tehran, Iran;2. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran;3. School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran;1. Structural Engineering Department, Federal University of Juiz de Fora, Brazil;2. Institute of Modelling and Computation, Hamburg University of Technology, Germany;1. Postgraduate Student (PhD Degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;2. Postgraduate Student (PhD Degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;3. Postgraduate Student (MsD degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;4. Postgraduate Student (PhD Degree), Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;6. Adjunct Professor, Department of Oral and Maxillofacial Surgery, University of Passo Fundo, Paraná, Brazil;5. Adjunct Professor, Department of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas-UNICAMP, Piracicaba, São Paulo, Brazil;1. School of Engineering and Design, Brunel University, UB8 3PH Uxbridge, UK;2. University of Naples ‘Federico II’, Via Claudio 21, 80125 Napoli, Italy;1. Department of Psychology, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, United Kingdom;2. Department of Experimental Psychology, University of Oxford, Oxford, OX1 3UD, United Kingdom;3. Psychology Research Centre, School of Design, Engineering and Computing, Bournemouth University, Poole, BH2 5BB, United Kingdom;4. School of Psychology, University of Birmingham, Birmingham, B15 2TT, United Kingdom |
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| Abstract: | In this study, an approach based on the modified Marciniak–Kuczynski (M–K) method for computation of an extended stress-based forming limit curve (FLC) is presented. The extended stress-based FLC is built based on equivalent plastic stress versus mean stress. This curve has some advantages in comparison with the conventional FLC. This new criterion is much more strain path independent than the conventional FLC. The effect of strain path on the predicted extended stress-based FLC is reexamined. For this purpose, two types of pre-straining on the sheet metal have been loaded. Moreover, the plane stress state assumption is not adopted in the current study. The influence of a through-thickness compressive normal stress is also investigated theoretically. The verifications of the theoretical FLCs are performed by using some available published experimental data. |
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| Keywords: | Forming Plastic behavior Normal stress Strain path |
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