Numerical and Experimental Study of Energy Absorption Amount of Functionally Graded Honeycomb with Negative Stiffness Property under Quasi-Static Load

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, University of Birjand, Birjand, Iran

2 Assoc. Prof., Mech. Eng., University of Birjand, Birjand , Iran

Abstract

Functionally graded honeycomb with negative stiffness can be used extensively as an energy absorber because of having two features of negative stiffness and being functionally graded. In this research, the effect of using functionally graded honeycomb with negative stiffness in increasing energy absorption has been considered. In functionally graded honeycomb the thicknesses of structure change gradually in each layer, as a result, each layer has a different stiffness. Negative stiffness honeycomb is a type of energy absorbers that absorb energy by the transition from one buckled shape to another and show snap through- like behavior.In this research, at first quasi-static tests have been carried out on negative stiffness honeycombs with constant thickness. Then finite element model of negative stiffness honeycomb with constant thickness is simulated in ABAQUS software and the results of simulation are compared with experimental results and a good agreement between numerical and experimental results has been observed. Functionally graded honeycomb with negative stiffness then has been modeled numerically. Energy absorption per unit mass of the functionally graded negative stiffness honeycomb has been compared with conventional ones. Based on the results, energy absorption per unit mass in functionally graded honeycomb with negative stiffness increased by 1.57 times.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 10
January 2021
Pages 2809-2822

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