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Technical Brief

Mechanical properties of the idealised inverse-opal lattice

[+] Author and Article Information
Bijoy Pal

Department of Mechanical and Aerospace Engineering, Indian Institute of Technology, Hyderabad, Kandi, 502285, India
me15mtech11021@iith.ac.in

Syed Nizamuddin Khaderi

Department of Mechanical and Aerospace Engineering, Indian Institute of Technology, Hyderabad, Kandi, 502285, India
snk@iith.ac.in

1Corresponding author.

ASME doi:10.1115/1.4038965 History: Received August 26, 2017; Revised January 09, 2018

Abstract

The idealized inverse-opal lattice is a network of slender struts that has cubic symmetry. We analytically investigate the elasto-plastic properties of the idealized inverse-opal lattice. The analysis reveals that the inverse-opal lattice is bending-dominated under all loadings, except under pure hydrostatic compression or tension. Under hydrostatic loading, the lattice exhibits a stretching dominated behavior. Interestingly, for this lattice Young's modulus and shear modulus are equal in magnitude. The analytical estimates for the elastic constants and yield behavior are validated by performing unit-cell finite element simulations. The hydrostatic buckling response of the idealized inverse-opal lattice is also investigated using the Floquet-Bloch wave method.

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