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Mechanical performance of polymer powder bed fused objects: FEM simulation and verification
KTH Royal institute of technology, Sweden.
RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.ORCID-id: 0000-0001-5902-4291
RISE - Research Institutes of Sweden, Bioekonomi, Biobaserade material.
RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.ORCID-id: 0000-0002-2622-9757
Vise andre og tillknytning
2018 (engelsk)Inngår i: Additive Manufacturing, ISSN 2214-8604, E-ISSN 2214-7810, Vol. 24, s. 577-586Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Additive manufacturing (3D printing) enables the designing and producing of complex geometries in a layer-by-layer approach. The layered structure leads to anisotropic behaviour in the material. To accommodate anisotropic behaviour, geometrical optimization is needed so that the 3D printed object meets the pre-set strength and quality requirements. In this article a material description for polymer powder bed fused also or selective laser sintered (SLS) PA12 (Nylon-12), which is a common 3D printing plastic, was investigated, using the Finite Element Method (FEM). The Material Model parameters were obtained by matching them to the test results of multipurpose test specimens (dumb-bells or dog bones) and the model was then used to simulate/predict the mechanical performance of the SLS printed lower-leg prosthesis components, pylon and support. For verification purposes, two FEM designs for a support were SLS printed together with additional test specimens in order to validate the used Material Model. The SLS printed prosthesis pieces were tested according to ISO 10328 Standard. The FEM simulations, together with the Material Model, was found to give good estimations for the location of a failure and its load. It was also noted that there were significant variations among individual SLS printed test specimens, which impacted on the material parameters and the FEM simulations. Hence, to enable reliable FEM simulations for the designing of 3D printed products, better control of the SLS process with regards to porosity, pore morphology and pore distribution is needed.

sted, utgiver, år, opplag, sider
2018. Vol. 24, s. 577-586
Emneord [en]
additive manufacturing, 3D printing, selective laser sintering, finite element method, material model
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-36296DOI: 10.1016/j.addma.2018.10.009Scopus ID: 2-s2.0-85056189717OAI: oai:DiVA.org:ri-36296DiVA, id: diva2:1263493
Tilgjengelig fra: 2018-11-15 Laget: 2018-11-15 Sist oppdatert: 2023-05-25bibliografisk kontrollert

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Alfthan, JohanFlodberg, GöranYang, Li

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