Evaluation of SLS-made PA12 under uniaxial tensile test

The morphing structures provide a development in aero field applications and they are being a realistic imitation of nature over time, bringing good efficiencies in many factors with respect to the conventional methodologies. On the other hand, these structures have some not-well predicted behaviors with new material applications. Polyamide 12 (PA12) is one of these new century materials manufactured by one of unconventional technologies, namely Selective Laser Sintering (SLS). Based on the morphing structures, the hexachiral and hexachiral tessellation morphologies are two of the in-demand researches not only in aero field but also in many other fields. As a sub-field of these researches, out-of-plane and in-plane crashworthiness of the hexachiral morphologies are being a great subject to be examined. Moreover, even there are many researches belong to out-of-plane crashworthiness, solely a limited number of resources for in-plane behavior can be found in literature. As a study case which tries to lighten up the material characteristics by considering in-plane behavior for further, SLS-made of PA12 specimens are subjected to uniaxial tensile tests in the current thesis. The main parameters were the orientation of manufacturing of the specimens which are produced in perpendicular orientations, and four different strain rates, namely one quasi-static and three dynamic conditions. The results showed that the Horizontal orientation represents the material specifications for the aim of usage in aero field better than the Vertical orientation. In dynamic tests, materials showed brittle behavior. With increasing strain rate, specimens have reached to UTS at relatively lower strains. However, for a consistent comparison of yield stresses, it is needed to perform more tests per each specimen. Furthermore, the numerical correlations are completed successfully.