Session: CIE-02 / 03 / 04 AMS: Joint Topics

Paper Number: 143698

143698 - Graded Minimal Surface Periodic Structures for Multiphysics Metamaterial Applications 

The continuous progress of additive manufacturing techniques has enabled engineers and designers to build complex geometries at various length scales with minimal setup time, reduced need for skilled labor, and minimal material waste. One important subset of structures endowed with complex geometrical features is formed by periodic and non-periodic metamaterials that enable a variety of engineering applications where certain combinations of performance features are desirable. For example, these structures could be used in a variety of naval engineering applications where light-weight, large surface area, energy absorption, heat dissipation, and acoustic bandgaps are critical. Nevertheless, to deploy these complex geometry structures their multiphysics response has to be well understood and characterized. The objective of the current effort is to describe an initial approach for designing and deploying graded triply periodic minimal surface (TPMS) architectures. The work focuses on three TPMS systems: (a) neovius, (b) Schoen's gyroid, and (c) Schoen's F-RD made of Ti-6Al-4V alloy. These three geometries are enhanced by using variable wall thickness to obtain the so-called graded TPMS. Three problems are explored: (1) evaluation of the elastic equivalent material properties of various unit cells with graded thickness; (2) investigation of acoustics dispersion properties of three cells and (3) a thermo-structural response of a complex geometry made of twelve graded representative volume elements (RVE). Finite element results of the relevant thermo-structural partial differential equations for the case of a gyroid triply periodic cylindrical sandwich structure are presented.   

Presenting Author: John Michopoulos U.S. Naval Research Laboratory

Presenting Author Biography: ..

Authors:

Nicole Apetre U.S. Naval Research Laboratory
John Michopoulos U.S. Naval Research Laboratory
Athanasios Iliopoulos U.S. Naval Research Laboratory
John Steuben U.S. Naval Research Laboratory
Steven Rodriguez U.S. Naval Research Laboratory
Benjamin Graber U.S. Naval Research Laboratory
Madan Kittur Naval Air Warfare Center Aircraft Division (NAWC-AD)