Abstract
Perforated steel plates with regularly shaped holes are already widely employed as steel dampers, which dissipate seismic energy through plastic deformation of steel. As a typical auxetic structure, two-dimensional (2D) re-entrant honeycomb configurations have characteristics of large deformation and good energy absorption. However, research on the effects of these configurations on the mechanical performance of steel is limited. This paper investigated the auxetic properties of perforated steel plates with re-entrant hexagon holes. Repetitive units are controlled by three parameters, hole ratio, re-entrant angle, and chamfer radius. Elastoplastic behavior and damage under large deformation were studied via tension tests and finite element (FE) analysis based on a micromechanics-based ductile fracture model. The effects of different parameters on mechanical properties of configurations were analyzed and discussed. The static performance of the perforated steel plates obtained in this study provides a good basis for its further dynamic study under large deformation.
Highlights
Materials and structures with negative Poisson’s ratios (NPRs) have attracted significant scientific interest because of their unique mechanical behaviors, such as increased shear modulus, energy absorption ability, fracture toughness, and vibration control [1,2,3,4,5]
H30A85R0.5 and H40A75R0.5, failed prematurely due to unexpected manufacturing defects, which was due to the complicated failed prematurely due to unexpected manufacturing defects, which was due to the complicated configurations and small sizes of the specimens
Notes: Fy, finite element (FE) and Fy, test denote the yield force of the FE analysis result and the experimental result, respectively; Fu, FE and Fu, test denote the ultimate force of the FE analysis result and the experimental esults, respectively; du, FE and du, test denote the ultimate displacement of the FE analysis result and (a) H40A85R0.5 (b) H50A85R0.5 the experimental result, respectively; the ultimate displacement refers to the instant when the force decreased to 85% of the peak load
Summary
Materials and structures with negative Poisson’s ratios (NPRs) have attracted significant scientific interest because of their unique mechanical behaviors, such as increased shear modulus, energy absorption ability, fracture toughness, and vibration control [1,2,3,4,5]. From theoretical analysis, these forms should have good performance under both static and dynamic loading cases, as energy absorbing and antiknock components. Since Lakes [7] and Evans [6] found the early forms, this field has been intensively investigated. Almgren [8] generated the first mechanical model with a NPR configuration.
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