Mechanical characterization and modelling of porous polymeric materials manufactured by selective laser sintering

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2009

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Tekin, Cevdet Murat

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Rapid prototyping methods embrace a family of manufacturing methods that are developed to speed up the prototyping stage of product design. The sole needed input for production being the solid model of the part, mold/tool-free production characteristics and the geometric part complexity that can be achieved due to layer-by-layer production have extended the applicability/research areas of these methods beyond prototyping. Local pore formation in part that occurs as a result of the discrete manufacturing nature of rapid prototyping methods can be viewed as an opportunity for material development. In this thesis, the manufacturing-internal (porous) structure-mechanical property relations of porous materials are investigated. These porous parts are produced via Selective Laser Sintering (SLS) which is a rapid prototyping method. The elastic modulus, tensile strength, rupture strength and Poisson’s ratio of uniform porous specimens with known porosities are determined through standardized mechanical tests for polymeric materials. The mechanical property variation profiles in graded materials are determined using the mechanical properties of uniform parts. The mechanical behavior of uniform and graded materials under applied loads are modeled using finite element method and simulation results are compared to the results of mechanical tests performed on graded materials. In addition, feasibility of producing resin filled composite parts from these uniform and graded porous parts are sought. Porous parts (both uniformly and graded) that are infiltrated with epoxy resin have been characterized mechanically and the results have been compared with the uninfiltrated porous parts.

Subject Keywords

Mechanical engineering.

URI

http://etd.lib.metu.edu.tr/upload/12611272/index.pdf
https://hdl.handle.net/11511/19205

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

C. M. Tekin, “Mechanical characterization and modelling of porous polymeric materials manufactured by selective laser sintering,” M.S. - Master of Science, Middle East Technical University, 2009.