Metamaterials that exhibit negative Poisson's ratio (NPR) are known as auxetics. They laterally expand or contract when they axially tensioned compressed. A re–entrant chiral auxetic structure (RCA) is a recently developed structure, which combines the topological features of and honeycombs. Comparative study between RCA popular benchmarks subjected to uniaxial compression has been conducted experimentally numerically. Specimens have fabricated from polyamide12 (PA12) using Multi Jet Fusion...

A novel 3D re-entrant chiral auxetic (RCA) structure has been proposed for the first time in this study. The unit cell developed with solid cubes and struts based on topological features of both honeycomb honeycomb. recently powerful printing process, Multi Jet Fusion (MJF), employed to print six samples from polyamide 12 (PA 12). Uniaxial quasi-static compressive tests have performed X, Y Z directions investigate deformation, Poisson's ratio energy absorption structure. Finite element (FE)...

In this study, the in-plane mechanical properties of auxetic structures subjected to dynamic compression have been investigated experimentally and numerically. The studied structures, which negative Poisson's ratios, include a recently developed structure named re-entrant chiral (RCA) structure, honeycomb, tetrachiral honeycomb anti-tetrachiral honeycomb. All were fabricated from polyamide12 (PA12) powder using multi jet fusion. Compressive tests conducted at constant crushing velocity 5 m...

Additive manufacturing is increasingly becoming potential for short‐run part production. The aim of this work to explore the mechanical properties a hybrid auxetic structure fabricated by multijet fusion (MJF) and fused filament fabrication (FFF). experimental measurements indicate that robust specimens with high‐dimensional accuracy are successfully achieved using MJF process. In case FFF process, walls–walls walls–cylinders areas (connecting areas) suffer large pores, indicating poor...

Abstract The mechanical performance of the medical stent is crucial and key significance to dependability reliability stent-plaque-artery system. In this study, an auxetic stent, namely, re-entrant chiral (RCA) proposed. Two types (RCA-X RCA-Y) are RCA stents designed through a periodic distribution two dimensional (2D) cells along both circumferential axial directions. A set polyimide specimens were 3d printed using Multi-Jet Fusion process. compressive properties experimentally examined,...

A hybrid auxetic structure, named re‐entrant chiral structure (RCA), is recently developed based on topological features of both and honeycombs. Herein, the in‐plane quasistatic dynamic performances RCA are compared. Experimental specimens for tests designed to have identical dimensions fabricated from polyamide12 (PA12) using an additive manufacturing process, Multi Jet Fusion (MJF). Compressive conducted at constant velocities 0.066 mm s −1 a Zwick Roell machine 5 m Instron VHS 8800...

Abstract This paper reports a structural modification of an auxetic metamaterial with combination representative re-entrant and chiral topologies, namely, (RCA) metamaterial. The main driving force for the was to overcome undesirable properties RCA such as anisotropic mechanical response under uniaxial compression. Additively manufactured polyamide 12 specimens via Multi Jet Fusion were quasi-statically compressed along two in-plane directions. experimental results confirmed that modified...

Abstract Auxetics are a unique class of innovative materials/structures. Auxetic material/structures possess negative value Poisson’s ratio owing to the distinguished deformation behavior represented by transvers expansion or contraction when they experience uniaxial stretching compression, respectively. The aim this manuscript is show contributions structural modification on an auxetic hybrid structure. in-plane properties structure, called modified re-entrant chiral (MRCA) structure under...

Abstract Inspired by butterfly, a bio butterfly-shaped auxetic metamaterial (BSAM) was recently proposed in which the unite cell of BSAM designed based on silhouette butterfly. The distinguished in-plane mechanical properties made potential absorber to be used broad range applications. aim this study is examine out-of-plane under quasi-static compression. Using validated FE models, comparison carried out between and two popular honeycombs, namely, re-entrant (RE) modified (MRE). Results...

Recent developments in the field of replacing and generating human tissues have led to a renewed interest finding alternative materials or composites that enhance development these technologies. Therefore, main goal current study was investigate effect adding nanomaterial with two-dimensional structure called silicene, which is also known as silicon nanosheet (SiNS) on among best leaders biomaterials are HA TCP. This investigation has examined fracture toughness property flexural strength...

Auxetic structural materials show distinctive properties by exhibiting a negative Poisson's ratio (NPR). When these structures are subjected to uniaxial loading, they expand in tension and contract compression both loading lateral directions. In this paper, two AlSi12 re-entrant honeycomb samples were manufactured using direct metal printing (DMP). Quasi-static was executed X Y direction. A Digital VIC-2D Image Correlation System used record the deformation history. Force displacement...

Composite materials are increasingly used in a broad range of applications due to their recognizable mechanical properties and the high strength-to-weight ratio. The aim current study is improve fracture toughness composite laminates. Several types fabrics, such as glass, carbon, Kevlar, micro-particles adopted create laminates via vacuum infusion method. performances proposed were evaluated tensile flexural strength tests. Moreover, impact tests conducted examine dynamic performances....