Finite Element Analysis of Aluminum Honeycombs Subjected to Dynamic Indentation and Compression Loads.

A.S.M Ashab,Dong Ruan,Guoxing Lu,Arafat Bhuiyan

doi:10.3390/ma9030162

Abstract

The mechanical behavior of aluminum hexagonal honeycombs subjected to out-of-plane dynamic indentation and compression loads has been investigated numerically using ANSYS/LS-DYNA in this paper. The finite element (FE) models have been verified by previous experimental results in terms of deformation pattern, stress-strain curve, and energy dissipation. The verified FE models have then been used in comprehensive numerical analysis of different aluminum honeycombs. Plateau stress, σpl, and dissipated energy (EI for indentation and EC for compression) have been calculated at different strain rates ranging from 102 to 104 s−1. The effects of strain rate and t/l ratio on the plateau stress, dissipated energy, and tearing energy have been discussed. An empirical formula is proposed to describe the relationship between the tearing energy per unit fracture area, relative density, and strain rate for honeycombs. Moreover, it has been found that a generic formula can be used to describe the relationship between tearing energy per unit fracture area and relative density for both aluminum honeycombs and foams.

Highlights

IntroductionA number of studies have been conducted on the out-of-plane compression of aluminum honeycombs at low and intermediate strain rates [3,4,5,6,7,8]
Over the last few decades, man-made honeycombs have been widely used in many industries due to their properties such as high strength to weight ratio and good energy absorption capabilities.Honeycombs are manufactured from materials such as aluminum, nomex, polymer, and ceramic.Aluminum honeycombs can be used as industrial products as well as core materials in sandwich panels in various fields of engineering such as aerospace, aircraft, automotive, and naval engineering [1,2].A number of studies have been conducted on the out-of-plane compression of aluminum honeycombs at low and intermediate strain rates [3,4,5,6,7,8]
ANSYS/LS-DYNA to study the mechanical behavior of honeycombs under out-of-plane indentation and compression loads over a wide range of high strain rates from 1 ˆ 102 to 1 ˆ 104 s1

Summary

Introduction

A number of studies have been conducted on the out-of-plane compression of aluminum honeycombs at low and intermediate strain rates [3,4,5,6,7,8]. Baker et al [5] conducted compression tests on aluminum honeycombs at different strain rates in the out-of-plane direction and found that the plateau stress, σ pl , increased with strain rate, ε. Both Xu et al [6] and Ashab et al [7] found that with the increase of t/l ratio (cell wall thickness to edge length ratio) and strain rate, plateau stress, σ pl , increased. Vijayasimha Reddy et al [8]

Methods

Results

Conclusion