A Comparative Study of Ballistic Resistance of Sandwich Panels with Aluminum Foam and Auxetic Honeycomb Cores

Abstract

An innovative auxetic-cored sandwich panel (AXP) is proposed. Its perforation resistant performance under high-velocity projectile impact was numerically analyzed using the validated finite element simulation techniques and compared with that of the aluminum foam-cored sandwich panel (AFP) of identical dimensions and weight. It has been found that the AXP is far superior to the AFP in ballistic resistance because of the material concentration at the impacted area due to the negative Poisson's ratio (NPR) effect. A parametric study was carried out to investigate the effects of several key parameters, including impact velocity, face and core thicknesses, and core density, on the ballistic resistance of the AXP and AFP. The results show that the ballistic limit and perforation energy of the AXP is greatly affected by these parameters. Meanwhile, the advantages of AXP over AFP being used as ballistic resistant structures are highlighted. The primary outcome of this research is new information on the development and design of advanced ballistic resistant structures containing auxetic materials.

Auxetic Cellular Materials - a Review

“…Three-point bending tests were also performed on different structures manufactured by the rapid prototyping [69], electron beam melting (EBM) [70] and Directionally Reinforced Integrated Singleyarn (DIRIS) concept [48]. Dynamic tests of auxetic materials were performed using indentation of the cylinder and ball [64], and, ballistic tests [71].…”

“…The auxetic materials have improved the shear performance (increased shear modulus) [78], damping, sound [79] (also with control of bands [80]) and energy absorption [64] and [71] of structural components, which makes them particularly useful for many special applications. They are being increasingly used in body and vehicle armour applications in sandwich plates for ballistic protection in combination with other materials [81] and [82] fiber composites for greater pull-out resistance (applied tension pull-out force causes increase of cross section area), increased sensitivity piezoelectric composites, new kinds of fasteners, which transversally contract when pushed into a socket (compression load) and expand when attempted to be removed (tension load) [72], flexible pads to reduce impact forces upon small (elbow) and large objects (leg, human torso) [63] which can also be used for sports applications [83], more comfortable textiles with reduced clothing pressure, medical devices (especially bandages) and fashion applications [84] and [85], promising and interesting medical application of auxetic materials such as in stents [77].…”

Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

“…The characteristic of indentation resistance can be broadly applied in protective devices, such as bulletproof and impact resistance equipment. Yang et al [113] numerically analyzed the perforation-resistant performance of the aluminum foam-cored sandwich panel and auxetic-cored Figure 13. Various types of perforation structures.…”

Response of Chiral Auxetic Composite Sandwich Panel to Fragment Simulating Projectile Impact

“…This unique deformation behaviour can be beneficial in many different applications, especially crashworthiness, blast and impact protection and can be further enhanced with graded porosity. [22] The studies in the field of ballistic loading of auxetic sandwich structures are very limited, [23,24] although some work has been performed in the field of blast loading of composite sandwich panels with auxetic core. [25][26][27][28] In all before mentioned contributions the beneficial influence of using auxetic core is reported.…”