Effect of temperature on the mechanical properties of additive manufacturing polymers

The principal aim of the work presented in this thesis is to acquire knowledge and experience, both practical and theoretical, in the fields of additive manufacturing processes and in the study of thermomechanical properties of viscoelastic, orthotropic polymers manufactured in such processes. Specifically it will verse on the Stratasys registered material SR-30 and the determination of the variation of its mechanical properties when tested at different temperatures. This tests would effectively condition the range at which this material can be used as a soluble core for composite material lamination. The specific type of technique presented among those qualified as additive manufacturing is FDM (Fused Deposition Modeling). The process developed during the time spent in the laboratory is based on the printing of several specific models in predefined geometries and tested in compression, and the subsequent performance of mechanical tests at controlled temperatures. These tests could potentially be proven to be very useful in the compilation of information regarding the extent of possible applications of the type of materials. The fabrication method studied provides a very broad range of manufacturing opportunities, as it is able to produce geometries that otherwise would need to be constructed in more than one piece, with the subsequent disadvantages in terms of time and costs, as well as a diminish both in mechanical and fatigue properties. Another advantage that cannot be overlooked is the elimination of adhesive processes as well as the mold conformation stage.