Failure modes in high strength and stiffness to weight scaffolds produced by Selective Laser Melting

摘要: The production of porous scaffold structures using additive manufacturing is becoming widespread, however a detailed understanding the failure mechanisms lacking. In this research, Selective Laser Melting (SLM) used to produce Ti–6Al–4V consisting regular array unit cells previously designed topology optimisation. Interrupted compression testing and subsequent X-Ray Micro Tomography (XMT) characterisation study deformation scaffolds for range solid fractions. Further, XMT data unloaded generate meshes finite element analysis which allowed direct comparison desired as built behaviour. Likely sites predicted from compare favourably with experimentally observed ones. Failure initiated in areas that exhibit greatest tensile stress, while onset commonly layered occurs afterwards. also highlights inaccuracies SLM build process, contributes stress concentrations horizontal arms within scaffolds. results indicate although strength optimised very high, further refinement both cell design quality would increase strength.