Affiliation:
1. School of Engineering, College of Engineering and Physical Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada
Abstract
We investigate the compressive energy absorption performance of polymeric octet-truss lattice structures that are 3D printed using high-resolution stereolithography. These structures are potential candidates for personal protective equipment, structural, and automotive applications. Two polymeric resins (high-strength/low-ductility and moderate-strength/high-ductility) were used in this work, and a comprehensive uniaxial tensile characterization was conducted to establish an optimal UV curing time. The external octet-truss structure geometry (3″ × 3″ × 3″) was maintained, and four different lattice cell densities (strut length, L) and three different strut radii (R) were printed, UV cured, and compression tested. The compressive stress–strain and energy absorption (EA) behavior were quantified, and the EA at 0.5 strain for the least dense and smallest R structure was 0.02 MJ/m3, while the highest density structure with the largest R was 1.80 MJ/m3 for Resin 2. The structural failure modes varied drastically based on resin type, and it was shown that EA and deformation behavior were related to L, R, and the structures’ relative density (ρ¯). For the ductile resin, an empirical model was developed to predict the EA vs. compressive strain curves based on L and R. This model can be used to design an octet-truss lattice structure based on the EA requirements of an application.
Funder
Natural Sciences and Engineering Research Council of Canada
Subject
Polymers and Plastics,General Chemistry
Reference38 articles.
1. Bitzer, T. (1997). Honeycomb Technology: Materials, Design, Manufacturing, Applications and Testing, Chapman and Hall. [1st ed.].
2. Multifunctionality of cellular metal systems;Evans;Prog. Mater. Sci.,1998
3. Additive manufacturing (3D printing): A review of materials, methods, applications and challenges;Ngo;Compos. B Eng.,2018
4. Mechanical metamaterials associated with stiffness, rigidity and compressibility: A brief review;Yu;Prog. Mater. Sci.,2018
5. The structural performance of near-optimized truss core panels;Chiras;Int. J. Solids Struct.,2002
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