NUMERICAL AND EXPERIMENTAL INVESTIGATION ON EFFECT OF DESIGN FACTORS ON SHEAR PROPERTIES OF ADDITIVELY MANUFACTURED TETRA-ANTI-CHIRAL CELLULAR METAMATERIAL

Abstract

This paper presents numerical and experimental investigation on the effect of design factors on mechanical properties of tetra-anti-chiral cellular metamaterial under shear loading. Two design factors namely cylinder radius and strut thickness, and three response characteristics including shear strength, modulus and specific energy absorption (SEA) of structure are considered in the present study. Finite element analysis (FEA) of CAD models of structures is performed using non-linear mechanical simulation. For experimentation, specimens are manufactured using material extrusion technique of additive manufacturing. A novel fixture is designed and manufactured for quick loading and unloading of structures for shear testing. It is observed that with decrease in cylinder radius, strength and modulus increases, but SEA decreases. However, all three responses increase with increase in strut thickness. Optimization of design factors is performed using grey relational analysis to maximize responses. Furthermore, predictive models of responses are developed using regression analysis.