Abstract
A new class of metamaterials known as auxetic/negative Poisson’s ratio (NPR) structures has wide applications in fields where high energy absorption and stiffness are required. The present work is focused on numerical investigation of double arrowhead (DAH) auxetic structures of polylactic acid (PLA) material under compressive loading. Deformation mechanism of DAH auxetic structures is studied for different configurations by varying geometrical parameters, namely first angle (θ1), second angle (θ2) and half-length (l). Nonlinear finite element models are developed for compressive loading and responses namely strength, modulus and specific energy absorption (SEA) are measured. It is found that all geometrical parameters significantly influence the responses of DAH auxetic structures. With increase in first angle, strength and modulus increase while SEA decreases. Responses increase with rise in second angle and reduction in half-length of unit cell of DAH auxetic structure.KeywordsAuxetic structuresPoisson’s ratioDouble arrowhead structureGeometric parametersCompressive strengthStiffnessSpecific energy absorption
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