PSI - Issue 18

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

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ScienceDirect

Procedia Structural Integrity 18 (2019) 163–169

25th International Conference on Fracture and Structural Integrity Effect of Aluminum Particles on the Fracture Toughness of Polyamide-based Parts Obtained by Selective Laser Sintering (SLS) Dan Ioan Stoia a , Liviu Marsavina b * a Politehnica University of Timisoara, Mihai Viteazul no.1, Timisoara 300222, Romania Abstract Numerous additive manufacturing technologies are currently used in industry and research: selective laser sintering, selective laser melting, electron beam melting, fused deposition modelling, laminated object manufacturing and stereolithography. Independently on the type of technology, a set of technological parameters have to be controlled in order to obtain good quality parts that also possesses acceptable mechanical properties. Selective laser sintering (SLS) is a multipurpose additive manufacturing technology that allows fabrication of good resolution parts with adequate mechanical properties. The versatility of the process refers to the limitless geometrical shapes that can be achieved and also to a variety of powders and mixtures that can be used. The uncontrollable process variables occurring along the sinterization process (heat transfer, humidity), together with the multitude of controllable technological factors, including raw materials, lead to inconsistencies in shape, size and mechanical properties of the parts. These inconsistencies appear not only in SLS but in all additive manufacturing technologies. The study proposes to underline the influence of the aluminum mixed polyamide on the fracture toughness and geometrical characteristics of parts manufactured using the same energy density but different orientations in the building environment. The findings can be used for part design and parameter setup, in order to prevent both mechanical and geometrical failures. 25th International Conference on Fracture and Structural Integrity Effect of Aluminum Particles on the Fracture Toughness of Polyamide-based Parts Obtained by Selective Laser Sintering (SLS) Dan Ioan Stoia a , Liviu Marsavina b * a Politehnica University of Timisoara, Mihai Viteazul no.1, Timisoara 300222, Romania Abstract Numerous additive manufacturing t chnol gies are curre tly used in industry and research: selective laser sintering, selective laser melting, electron beam melting, fused deposition modelling, laminated object manufacturing and stereolithography. Independently on the type of technology, a set of technological parameters have to be controlled in order to obtain good quality parts t at also possesses acceptable mechanical properties. Selective laser sintering (SLS) is a multipurpos additive manufacturing technology that allows fabrication of good resolution parts with dequate mechanical properties. The v rsatility of the process refers to the limitless geometrical shapes that can be achieved and also to a v riety of powders and mixtures that can be used. The unc ntrollable process variables occurring along the sinterization process (heat transfer, humidity), together with the multitude of controllable technological factors, includi g raw materials, lead to inconsisten ies in shape, size and mechanical properties of the parts. These inconsistencies appear ot o ly in SLS but in all additive manufacturing technologies. The study proposes to underline the influence of the aluminum mixed polyamide o the fracture toughness and geometrical characteristics of parts m nufactured using the same energy ensity but different orientations in the building environment. The findings can be used for part design and parameter setup, in order to prevent both mechanical and geometrical failures.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Additive manufacturing, Fracture toughness, Alumide, Polyamide, Selective laser sintering Keywords: Additive manufacturing, Fracture toughness, Alumide, Polyamide, Selective laser sintering

1. Introduction The efforts on mechanical and geometrical characterization of additive manufactured parts concerns more authors as the additive technologies became more available on the market. Having access to these technologies represents a 1. Introduction The efforts on mechanical and geo etrical characterization of additive manufactured parts concerns more authors as the additive technologies became more available on the market. Having access to these technologies represents a

* Corresponding author. E-mail address: liviu.marsavina@upt.ro * Correspon ing author. E-mail address: liviu.marsavina@upt.ro

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.150