PSI - Issue 21

Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 21 (2019) 190–197

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers Abstract In the scope of the study, the plasticity and ductile fracture behavior of additively manufactured AlSi10Mg tensile specimens were investigated at quasi-static strain rate experimentally and numerically. Small uniaxial tensile and notched test specimens were produced in three different scanning directions, i.e. 0°, 45° and 90°, by selective laser melting (SLM) method. Digital image correlation (Aramis software, GOM GmbH) was used to determine local strain fields on the specimens surface during loading. Simulation studies were carried out in commercial software LS-Dyna, LSTC. In order to predict the deformation behavior of the additively manufactured specimens, Cazacu-Barlat (*MAT_233) was selected. The flow curve was extrapolated with Hockett-Sherby hardening law by the inverse parameter identification. The stress triaxiality is a highly significant factor that controls the initiation of fracture. However, unpredicted fractures are attributed to the evolution of pores in the material. The additively manufactured specimens show a high porosity. Heterogeneously distributed pores caused unexpected damage on the surface where the supported structure was produced and the specimens showed unstable behavior. Therefore, the initial failure started at the supported structure of the notched specimens. In order to interpret the damage evolution caused by pores, SEM (Scanning Electron Microscope) images were obtained at fractured surface and non-damaged surface. The results showed that larger pores in structures are critical. For this reason, numerical specimens including randomly distributed pores were created and investigated to observe the effect of pores simultaneously. The numerical results showed that the existence of randomly distributed pores in the model showed more realistic description of the material behavior, especially in plasticity and fracture. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials Fracture prediction of additively manufactured AlSi10Mg materials E. F. Akbulut Irmak* and T. Tröster Chair of Automotive Lightweight Design, Paderborn University, Paderborn 33098, Germany Abstract In the scope of the study, the plasticity and duct le fracture behavio of addit vely manufactured AlSi10Mg tensile sp c mens were investigated at quasi-static strain rate experimentally and numeric lly. Small uniax al tensile and notched test were produced in three different scann ng di ctions, i.e. 0°, 45° and 90°, by sel ctive laser melting (SLM) method. Digi al image correlation (Aramis softw re, GOM GmbH) was used to determine lo al strain fields on the specim ns surface during loading. Simulation stu ies were carried out in commercial software LS-Dyna, LSTC. In order to predict the deformation behavior of the additively manufactured specimens, Cazacu-Barlat (*MAT_233) was s lected. The flow curv was xtrapolated with Hockett-Sherby hard ning law by the inve se parameter identification. The stress t iaxiality is a highly significant factor that ontrols the initiation of fracture. However, unpredicted fr ctu es ar attribut d to the evolution of pores in t e material. The additively manufactur specimens show a high porosity. Heterogeneously distributed pores caused unexpect d damage on the surfac where the supported structure was produced and th specime s showed nstable behavior. Therefore, the initi l failur started at the supported structure of the notched specimens. In ord r t interpret the damag evolutio caused by pores, SEM (Scanning El c ron Microscope) images wer obtain d at fractured surface and non-da aged surface. The results s owed that larger pores in struct r s are crit cal. For this reason, numerical spe imens including randomly distributed por s were created and i vestigated to observe the effect of pores simultaneously. The numerical results showed that the existence of randomly distributed pores in the model showed more realistic description of the material behavior, especially in plasticity and fracture. © 2019 The Autho s. Publ shed by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials Fracture prediction of additively manufactured AlSi10Mg materials E. F. Akbulut Irmak* and T. Tröster Chair of Automotive Lightweight Design, Paderborn University, Paderborn 33098, Germany Keywords: Fracture; Porosity; Additive Manufacturing

Keywords: Fracture; Porosity; Additive Manufacturing

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers 2452 3216 © 2019 Th Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the 1st International Workshop on Plasticity, Damage and Fracture of Engineering Materials organizers 10.1016/j.prostr.2019.12.101