Insights into the mechanical properties of several triply periodic minimal surface lattice structures made by polymer additive manufacturing

POLYMER

卷:152

Article

Maskery, I.¹  Sturm, L.²  Aremu, A. O.¹  Panesar, A.^1,3  Williams, C. B.²  Tuck, C. J.¹  Wildman, R. D.¹  Ashcroft, I. A.¹  Hague, R. J. M.¹ 

[1] Univ Nottingham, Ctr Addit Mfg, Fac Engn, Nottingham NG7 2RD, England

[2] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[3] Imperial Coll London, Fac Engn, Dept Aeronaut, London SW7 2AZ, England

关键词: Selective laser sintering;    Additive manufacturing;    Cellular solid;    Lattice;    Triply periodic minimal surface;   

DOI  :  10.1016/j.polymer.2017.11.049

来源: Elsevier

【 摘 要 】

Three-dimensional lattices have applications across a range of fields including structural lightweighting, impact absorption and biomedicine. In this work, lattices based on triply periodic minimal surfaces were produced by polymer additive manufacturing and examined with a combination of experimental and computational methods. This investigation elucidates their deformation mechanisms and provides numerical parameters crucial in establishing relationships between their geometries and mechanical performance. Three types of lattice were examined, with one, known as the primitive lattice, being found to have a relative elastic modulus over twice as large as those of the other two. The deformation process of the primitive lattice was also considerably different from those of the other two, exhibiting strut stretching and buckling, while the gyroid and diamond lattices deformed in a bending dominated manner. Finite element predictions of the stress distributions in the lattices under compressive loading agreed with experimental observations. These results can be used to create better informed lattice designs for a range of mechanical and biomedical applications. (C) 2017 The Authors. Published by Elsevier Ltd.

【 授权许可】

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