Fracture toughness in additive manufacturing by selective laser sintering: an overview

Abstract

This paper presents manufacturing, testing, and computing steps for determining the fracture toughness property of polyamide PA 2200 processed by laser sintering using different process parameters. The design of the samples was conducted according to ASTM D5045-99 and ASTM D5528-01, and the fracture tests consist of four-point bending in symmetric and asymmetric configuration and double cantilever beam test. The process parameters selected as variables were in-plane orientation, spatial orientation, energy density of the process, and induced structural defects. The results provide an extended view regarding the variation of fracture properties when the manufacturing conditions in laser sintering are changed.

Anisotropic and elastoplastic mode‐I fracture toughnesses of three additively manufactured polymers fabricated via material extrusion and powder bed fusion

“…These explanations are applicable to most AM polymers or metals due to the same layer-by-layer structure. 16,17 Marsavina et al 18 found that the K IC value of their SLS-PA specimens was 2.1 to 2.7 MPa.m 1=2 , which is consistent with the presented results (2.3 to 2.7 MPa.m 1=2 ). However, the reported K IC value of bulk PA ranges from 2.22 to 5.62 MPa.m 1=2 , 8 so the K IC value of SLS-PA measured here was close to the lower limit of bulk PA.…”

“…Marsavina et al 18 found that the K IC value of their SLS‐PA specimens was 2.1 to 2.7 MPa. , which is consistent with the presented results (2.3 to 2.7 MPa.…”