COMPARISON OF FRACTURE MECHANICS PARAMETERS DURING TESTING OF SENT SPECIMENS MADE BY DIFFERENT ADDITIVE PRODUCTION TECHNIQUE

Abstract

How and in which field products made by additive technologies can be applied depends not only on the type of material and manufacturing technique but also on the economic aspect. The most affordable materials and techniques are often used for rapid product development. These products are very often a replacement or temporary part in a machine assembly. The integrity of such an assembly due to the mechanical characteristics of the materials used in additive manufacturing most often depends on the element made by additive manufacturing. In order to understand the question of the integrity of the element itself and on that basis to choose the technique and material for the production of elements, it was necessary to compare the parameters of fracture mechanics for two types of materials. In this study, the results of fracture mechanical parameters will be presented. Parameters of fracture mechanics was obtained by using the Aramis 2M system by the method of digital image correlation (DIC) and a universal machine for testing the mechanical properties of materials (Shimadzu AGS-X 100kN) on SENT (Single Edge Notched Tension) type specimens. One part of the tested specimens was made of PLA (polylactic acid) material on a FDM (Fused Deposition Modeling) type printer while the other part of the tested specimens was made of photopolymer resin (Photopolymer resin Gray, FLGPGR04 by FormLabs) made by stereo lithography technique on an SLA (Stereolithography Apparatus) printer. The examination confirmed the repeatability of the results and on the basis of them the parameters of fracture mechanics for both types of specimens were determined.