Mechanical properties comparison of strut-based and TPMS lattice structures produced by EBM

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Master_Thesis_Baris_Sokollu.pdf

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2022-4-28

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Sokollu, Barış

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Additive manufacturing is a relatively old but rapidly emerging innovative technology that enables various shapes and designs to be realized which are almost not possible with conventional manufacturing. Lattice structures are one of the most unique applications of utilizing additive manufacturing technology due to weight-to-strength ratios they offer, high impact absorption capabilities, and difficult to produce with conventional approaches. Studies in the literature are mainly focusing on the strut-based crystal-like structures i.e., Body-Centered Cubic (BCC) and Face-Centered Cubic (FCC) while fewer studies examine the Triply Periodic Minimal Surface (TPMS) topologies. Although there are several works showing the mechanical properties of these topologies individually, there is a lack of comparative study in the literature. In this thesis work, comparative investigation of mechanical responses of five different lattice topologies which are BCC, FCC, Gyorid, Primitive, and Diamond under tension and compression loads is aimed. Scope of the thesis is specified as powder removal study, production of test samples made by Ti6Al4V, Scanning Electron Microscope (SEM) imaging prior to experiments, conducting tension and compression testing considering available standards, comparison of compression results with Gibson-Ashby theoretical model, investigation of microstructures from fracture surfaces, and finite element analysis (FEA) verification by the test results.

Subject Keywords

Additive manufacturing, Lattice structures, Triply periodic minimal surfaces, Electron beam melting, Ti6Al4V

URI

https://hdl.handle.net/11511/97320

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

B. Sokollu, “Mechanical properties comparison of strut-based and TPMS lattice structures produced by EBM,” M.S. - Master of Science, Middle East Technical University, 2022.