Experimental and numerical analysis of effective geometrical parameters for energy absorbing of the structures with negative Poisson's ratio made from aluminium alloy 1100

Through experimental work and finite element simulations this paper investigates the effective geometrical parameters which absorb energy for structures with negative Poisson's ratio (auxetix structures). In the experimental section, the re-entrant auxetic structure is made from aluminum 1100 and subjected to quasi-static loading as well as stress-strain diagram. Then, the energy absorbing and specific energy absorbing values are calculated. Also, the amount of negative Poisson's ratio (NPR) is evaluated for every step of loading, and the results are compared with the finite element method. Good agreements are found between the experimental and FE results. Next, the effective parameters for energy absorbing including horizontal and oblique strut, initial angle, and structural thickness are investigated. The results show with the increase of the structural thickness and decrease of the initial angle, both horizontal and oblique strut length absorbing energy and specific absorbing energy increase. Finally, the results show, comparing to the honeycomb, the auxetic structure has higher ability to absorb energy.