Refining constitutive relation by integration of finite element simulations and Gleeble experiments |
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| Affiliation: | 1. College of Sciences, Northeastern University, Shenyang 110004, China;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. Energy Safety Research Institute, Swansea University, Bay Campus, Swansea, SA1 8EN, UK;2. Chemistry Department, College of Sciences, King Saud University, Riyadh, Saudi Arabia;3. Department of Chemistry, Rice University, Houston, Texas, 77005, USA;4. Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, USA;1. Ecole Polytechnique Fédérale de Lausanne, LSMX, Station 12, CH-1015 Lausanne, Switzerland;2. Univ Bretagne-Sud, EA 4250, LIMATB, F-56100 Lorient, France;3. Constellium Technology Center, 725 rue Aristide Bergès, Centr’Alp, 38341 Voreppe, France;4. Ecole Polytechnique Fédérale de Lausanne, NXMM, Station 12, CH-1015 Lausanne, Switzerland;1. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;2. Shanghai Turbine Works Company, Shanghai, China;1. College of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;2. High Temperature Materials Division, Central Iron and Steel Research Institute, Beijing 100081, China |
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| Abstract: | Thermo-mechanical coupled finite element calculations were carried out to simulate the Gleeble compression of the samples of a titanium alloy (Ti60), and the results are analyzed and compared with the actual compression tests conducted on a Gleeble 3800 thermo-mechanical simulator. The changes in temperature, stress and strain distribution in the samples and the source of error on the constitutive relations from Gleeble hot compression test were analyzed in detail. Both simulations and experiments showed that the temperature distribution in the specimen is not uniform during hot compression, resulting in significant deformation inhomogeneity and non-ignorable error in the flow stress strain relation, invalidating the uniform strain assumption commonly assumed when extracting the constitutive relation from Gleeble tests. Based on the finite element simulations with iterative corrections, we propose a scheme to refine the constitutive relations from Gleeble tests. |
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| Keywords: | Titanium alloy Constitutive relation Finite element Compression Temperature distribution |
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