Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316L
The aim of this work was to monitor the mechanical behavior of 316L stainless steel produced by 3D printing in the vertical direction. The material was tested in the “as printed” state. Digital Image Correlation measurements were used for 4 types of notched specimens. The behavior of these specimens...
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2020-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/1/33 |
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| author | Michal Kořínek Radim Halama František Fojtík Marek Pagáč Jiří Krček David Krzikalla Radim Kocich Lenka Kunčická |
| author_facet | Michal Kořínek Radim Halama František Fojtík Marek Pagáč Jiří Krček David Krzikalla Radim Kocich Lenka Kunčická |
| author_sort | Michal Kořínek |
| collection | DOAJ |
| description | The aim of this work was to monitor the mechanical behavior of 316L stainless steel produced by 3D printing in the vertical direction. The material was tested in the “as printed” state. Digital Image Correlation measurements were used for 4 types of notched specimens. The behavior of these specimens under monotonic loading was investigated in two loading paths: tension and torsion. Based on the experimental data, two yield criteria were used in the finite element analyses. Von Mises criterion and Hill criterion were applied, together with the nonlinear isotropic hardening rule of Voce. Subsequently, the load-deformation responses of simulations and experiments were compared. Results of the Hill criterion show better correlation with experimental data. The numerical study shows that taking into account the difference in yield stress in the horizontal direction of printing plays a crucial role for modeling of notched geometries loaded in the vertical direction of printing. Ductility of 3D printed specimens in the “as printed” state is also compared with 3D printed machined specimens and specimens produced by conventional methods. “As printed” specimens have 2/3 lower ductility than specimens produced by a conventional production method. Machining of “as printed” specimens does not affect the yield stress, but a significant reduction of ductility was observed due to microcracks arising from the pores as a microscopic surface study showed. |
| first_indexed | 2024-03-10T13:49:44Z |
| format | Article |
| id | doaj.art-bc2fd164df214d70a7b638a9fbb9889b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T13:49:44Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-bc2fd164df214d70a7b638a9fbb9889b2023-11-21T02:15:04ZengMDPI AGMaterials1996-19442020-12-011413310.3390/ma14010033Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316LMichal Kořínek0Radim Halama1František Fojtík2Marek Pagáč3Jiří Krček4David Krzikalla5Radim Kocich6Lenka Kunčická7Department of Applied Mechanics, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicDepartment of Applied Mechanics, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicDepartment of Applied Mechanics, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicDepartment of Machining, Assembly and Engineering Metrology, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicDepartment of Mathematics and Descriptive Geometry, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicDepartment of Applied Mechanics, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicDepartment of Materials Forming, Faculty of Materials Science and Technology, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicInstitute of Physics of Materials, Academy of Science of Czech Republic, Žižkova 513/22, 616 62 Brno, Czech RepublicThe aim of this work was to monitor the mechanical behavior of 316L stainless steel produced by 3D printing in the vertical direction. The material was tested in the “as printed” state. Digital Image Correlation measurements were used for 4 types of notched specimens. The behavior of these specimens under monotonic loading was investigated in two loading paths: tension and torsion. Based on the experimental data, two yield criteria were used in the finite element analyses. Von Mises criterion and Hill criterion were applied, together with the nonlinear isotropic hardening rule of Voce. Subsequently, the load-deformation responses of simulations and experiments were compared. Results of the Hill criterion show better correlation with experimental data. The numerical study shows that taking into account the difference in yield stress in the horizontal direction of printing plays a crucial role for modeling of notched geometries loaded in the vertical direction of printing. Ductility of 3D printed specimens in the “as printed” state is also compared with 3D printed machined specimens and specimens produced by conventional methods. “As printed” specimens have 2/3 lower ductility than specimens produced by a conventional production method. Machining of “as printed” specimens does not affect the yield stress, but a significant reduction of ductility was observed due to microcracks arising from the pores as a microscopic surface study showed.https://www.mdpi.com/1996-1944/14/1/33stainless steel 316Ladditive manufacturingmultiaxial loadingplasticitydigital image correlation methodhill yield criterion |
| spellingShingle | Michal Kořínek Radim Halama František Fojtík Marek Pagáč Jiří Krček David Krzikalla Radim Kocich Lenka Kunčická Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316L Materials stainless steel 316L additive manufacturing multiaxial loading plasticity digital image correlation method hill yield criterion |
| title | Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316L |
| title_full | Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316L |
| title_fullStr | Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316L |
| title_full_unstemmed | Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316L |
| title_short | Monotonic Tension-Torsion Experiments and FE Modeling on Notched Specimens Produced by SLM Technology from SS316L |
| title_sort | monotonic tension torsion experiments and fe modeling on notched specimens produced by slm technology from ss316l |
| topic | stainless steel 316L additive manufacturing multiaxial loading plasticity digital image correlation method hill yield criterion |
| url | https://www.mdpi.com/1996-1944/14/1/33 |
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