Application of composite material models to determine the Young's modulus of the grid pattern of partially infilled 3D printed samples

S. TOGNANA; M. POMARICO; S. MONTECINOS; W. SALGUEIRO

Engineering Research Express

IOPScience

Lugar: Londres; Año: 2023 vol. 5 p. 45049 - 45049

Additive manufacturing makes it possible to fabricate samples with partial internal infill. This type of sample has a different Young´s modulus than a completely filled sample. In this work, the dependence of the apparent Young´s modulus of samples manufactured by 3D printing on the infill percentage has been experimentally determined, for a given pattern and using a non-destructive technique. Young´s modulus was assumed as an apparent modulus and values were found between 3.39 GPa for the sample with 100% infill and 1.32 GPa for the sample with 20% infill. In particular, a non-linear variation of the apparent Young´s modulus was observed. The specific Young´s modulus presents a minimum for an intermediate infill percentage. The use of a model of composite materials was proposed, as a first approach to determine the apparent Young´s modulus of the parts. The mixture law, the Halpin-Tsai equation generalized by Kerner, a model of foams and the Mori Tanaka method were applied to the dependence of the apparent Young´s modulus on the infill percentage, giving all, except the mixture law, acceptable results. The advantage of applying each model was discussed. This type of analysis would allow a fast semi-empirical approach of the apparent Young´s modulus in partially filled samples with a grid pattern.