Vol. 2, No. 10, 2007

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ISSN: 1559-3959
Experimental and computational evaluation of compressive response of single and hex-arrayed aluminum tubes

Sia Nemat-Nasser, Mahmoud Reza Amini, Jeom Yong Choi and Jon Isaacs

Vol. 2 (2007), No. 10, 1901–1920
Abstract

We report experiments and simulations of the dynamic and quasistatic compressive response of single and hex-arrayed thick aluminum tubes. The investigation aims to further characterize how tube-based sandwich structures absorb energy. First, we study by compression tests the quasistatic buckling of single tubes of 7075 aluminum, an alloy showing sufficient ductility and plasticity to make it potentially a good choice for energy absorbing devices. The experiments show geometry-dependent buckling modes. The corresponding finite element numerical simulations correlate well and will help estimate the maximum load level, and the buckling and postbuckling responses. Second, we study the dynamic buckling of sandwiched, hex-arrayed 3003 aluminum tubes. The simulations and experimental results correlate well and show a remarkable increase in energy absorbing capacity, which is caused by the postbuckling interaction of neighboring tubes. They also show that, as the tube spacing is decreased, the overall energy absorbed increases significantly. We also simulate how varying tube length and thickness affect the buckling of the array under dynamic loading.

Keywords
sandwich structures, aluminum tubes, dynamic compression, quasistatic compression, LS\_DYNA, physics-based material model
Milestones
Received: 20 May 2007
Accepted: 23 May 2007
Published: 1 December 2007
Authors
Sia Nemat-Nasser
Center of Excellence for Advanced Materials
Department of Mechanical and Aerospace Engineering
University of California San Diego
La Jolla, CA 92093-0416
United States
Mahmoud Reza Amini
Center of Excellence for Advanced Materials
Department of Mechanical and Aerospace Engineering
University of California San Diego
La Jolla, CA 92093-0416
United States
Jeom Yong Choi
POSCO Technical Research Laboratories
Pohang, Kyeongbuk
790–785, Korea
Jon Isaacs
Center of Excellence for Advanced Materials
Department of Mechanical and Aerospace Engineering
University of California San Diego
La Jolla, CA 92093-0416
United States