Finite element simulation of the temperature and stress fields in single layers built without-support in selective laser melting |
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| Affiliation: | 1. Neue Materialien Bayreuth GmbH,95448Bayreuth,Germany;2. Airbus Endowed Chair for Integrative Simulation and Engineering of Materials and Processes (ISEMP), University of Bremen, 28359 Bremen, Germany;3. Concept Laser GmbH, 96215 Lichtenfels, Germany;1. Faculty of Mechanical Engineering, Istanbul Technical University, Gumu?suyu, Istanbul, Turkey;2. Department of Mechanical Engineering, Faculty of Engineering, Istanbul University-Cerrahpa?a, 34320 Avcilar, Istanbul, Turkey;3. Department of Computer Science and Engineering, Department of CSE, IIT (ISM) Dhanbad, India;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, 210016 Nanjing, PR China;2. Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Yudao Street 29, 210016 Nanjing, PR China;1. Chongqing Key Laboratory of Additive Manufacturing Technology and Systems, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China;2. College of Material Science and Engineering, Sichuan University, Chengdu 610065, PR China |
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| Abstract: | Overhanging and floating layers which are introduced during the build in selective laser melting (SLM) process are usually associated with high temperature gradients and thermal stresses. As there is no underlying solid material, less heat is dissipated to the powder bed and the melted layer is free to deform resulting undesired effects such as shrinkage and crack. This study uses three-dimensional finite element simulation to investigate the temperature and stress fields in single 316L stainless steel layers built on the powder bed without support in SLM. A non-linear transient model based on sequentially coupled thermo-mechanical field analysis code was developed in ANSYS parametric design language (APDL). It is found that the predicted length of the melt pool increases at higher scan speed while both width and depth of the melt pool decreases. The cyclic melting and cooling rates in the scanned tracks result high VonMises stresses in the consolidated tracks of the layer. |
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