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Journal of Intelligent Material Systems and Structures
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In-plane Tensile Behavior of Shape Memory Alloy Honeycombs with Positive and Negative Poisson's Ratio

M.R. Hassan

Department of Mechanical and Manufacturing Engineering, University Putra Malaysia, 43400 Serdang Selangor, Malaysia

F. Scarpa

Department of Aerospace Engineering, University of Bristol, University Walk, Bristol, BS8 1TR, UK, f.scarpa{at}bris.ac.uk

N.A. Mohamed

Department of Mechanical and Material Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

This work illustrates the manufacturing and tensile testing of a novel concept of honeycomb structures with hexagonal and auxetic (negative Poisson's ratio) topology, made of shape memory alloy core material. The honeycombs are manufactured using Nitinol ribbons having 6.40 mm of width and 0.2 mm of thickness. The ribbons were inserted in a special dye using cyanoacrilate to bond the longitudinal strips of the unit cells. Tensile tests at room temperature (full martensite) were performed on the honeycombs. Finite element models of the honeycomb assemblies under tensile loading have been developed using nonlinear beam elements from a commercial code. Good agreement is observed between numerical nonlinear simulations and the experimental results.

Key Words: SMA • honeycomb • auxetic • finite element • tensile loading.

This version was published on May 1, 2009

Journal of Intelligent Material Systems and Structures, Vol. 20, No. 8, 897-905 (2009)
DOI: 10.1177/1045389X08099605
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