Influence of Manufacturing Parameters on Mechanical Properties of Porous Materials by Selective Laser Sintering

Abstract

This paper presents a study on the tensile properties of Alumide and polyamide PA2200 standard samples produced by Additive manufacturing (AM) based on selective laser sintering (SLS). Because of the orthogonal trajectories of the laser beam during exposure, different orientations of the samples may lead to different mechanical properties. In order to reveal this process issue, four orientations of the samples in building envelope were investigated. For data reliability, all the other process parameters were constant for each material and every orientation. The tensile tests highlight small differences in elastic properties of the two materials, while significant differences in strength properties and energy absorption were observed. Nevertheless, Young modulus indicates high stiffness of the Alumide comparing to PA2200 samples. The stereo microscopy reveals a brittle fracture site for Alumide and a ductile fracture with longitudinal splitting zones for PA2200. From the orientation point of view, similar properties of samples oriented at 0 and 90 degrees for all investigated mechanical properties were observed. However, tensile strength was less influenced by the sample orientations.

Stress Relaxation and Creep of a Polymer-Aluminum Composite Produced through Selective Laser Sintering

“…where: µ r 1 and µ r 2 -dynamic viscosities. The formulae in Equation (27) and the data in Table 1 were used to calculate the coefficients µ r 1 and µ r 2 for each specimen type. The values, rounded to the nearest integers, are provided in Table 3.…”

“…The study has largely contributed to the development of 3D printing.This article focuses on the rheological properties of a polyamide P12-based composite material containing a low percentage of aluminum. Details of the material properties are provided in [19,26,27]. The material is well suited to fabricating medical devices such as orthoses or biomodels.…”

Flexural properties of selectively sintered polyamide and Alumide

“…Selective laser sintering (SLS) is an additive manufacturing technology that fuses powder particle together in order to obtain a body in solid form. The geometrical versatility of the parts produced by SLS represents the top characteristic of this technology . The deflections from the nominal shape and size and also the mechanical properties of the obtained parts are representing a challenging aspect …”

“…The geometrical versatility of the parts produced by SLS represents the top characteristic of this technology. 1,2 The deflections from the nominal shape and size and also the mechanical properties of the obtained parts are representing a challenging aspect. 3,4 The mechanical characterization of SLS plastic parts was conducted through tensile tests by some authors, 5,6 while in other studies, flexural properties were determined according to manufacturing parameters, 7,8 leading to the conclusion that process parameters are greatly influencing the mechanical properties of samples.…”

“…The influence of the parts orientation in XY plane and the anisotropy in the growing direction have been evidenced for Alumide, and for polyamide, both in selective laser sintering, but for tensile samples. 2,9 Also, fracture toughness for additively manufactured parts have been determined according part orientation in plane and space. 10,11 Other authors use notched AM specimens in order to determine the fatigue strength of titanium, obtained by selective laser melting.…”