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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 |
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Vol. 2 (2007), No. 10, 1901–1920
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Abstract |
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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
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Milestones
Received: 20 May 2007
Accepted: 23 May 2007
Published: 1 December 2007
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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 |
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| 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 |
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| Jeom Yong Choi | |
| POSCO Technical Research
Laboratories Pohang, Kyeongbuk 790–785, Korea |
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| 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 |
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