Energy Absorption by 3D-Printed Mesh Structures with a Negative Poisson’s Ratio

doi:10.1007/s40195-023-01640-6

Abstract

Abstract:

A negative Poisson's ratio (NPR) structure represents optimal impact-resistance with applications in various fields, including the crash box in vehicles, which absorbs impact kinetic energy. The crash box is designed to deform in response to impact, increasing local structural density, which enhances impact resistance performance. Current studies have only focused on the NPR effect in the plane dimension at low-speed loads. Few studies have considered high-speed impact loads on three-dimensional NPR structures. We have developed two types of AlSi10Mg alloy energy-absorbing structures with NPR using three-dimensional printing technology, and have compared our systems with a conventional hexagonal mesh structure. Sample testing involved split-Hopkinson pressure bar measurements, which showed good agreement with dynamic numerical simulations. When subjected to an impact load, the NPR structure exhibited better impact resistance and energy absorption compared with the positive Poisson's ratio structure. The proposed dual-layer hexagonal structure ensures an NPR effect while exhibiting higher strength and improved stability relative to the conventional concave hexagon structure.

Key words: Negative Poisson’s ratio, Energy absorption, 3D printing, Split-Hopkinson pressure bar, Numerical simulation

Wenyu Li, Weiming Yang, Mingze Li, Xiang Zhang, Ping Zhang, Yucheng Zhao, Peijian Chen, Haishun Liu. Energy Absorption by 3D-Printed Mesh Structures with a Negative Poisson’s Ratio[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(1): 205-212.

Figures/Tables 8

Fig. 1 Concave hexagonal NPR structure

Table 1 Mechanical property parameters of the 3D-printed AlSi10Mg

Young modulus (GPa)	Poisson's ratio	Yield strength (MPa)	Density (kg/m³)
35.93	0.3	177.47	2720

Fig. 2 Model and forming diagrams of the three mesh structures

Fig. 3 Stress-strain curves for the three structures

Fig. 4 Energy absorption curves for the three mesh structures with respect to time: a total energy absorption, b specific absorption energy

Fig. 5 SEM images of the sample fracture morphology

Fig. 6 Comparison of experimental and simulation results: a T1, b T2, c T3

Fig. 7 Stress cloud map distributions for the three structures. T1: 0.2 ms a, 0.6 ms b, and 1.0 ms c. T2: 0.2 ms d, 0.6 ms e, and 1.0 ms f. T3: 0.2 ms g, 0.6 ms h, 1.0 ms i

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