The mechanical response of metallic sandwich beams under foam projectile impact loading

Abstract

The dynamic response of the clamped sandwich beams was investigated by impacting the beams at mid-span with metal foam projectiles. Effects of applied impulse, face-sheet thickness and core thickness on the impact resistance of sandwich beams are discussed. Using strain gauge measurement technique, the deformation mechanism of sandwich beams was analyzed in the paper. The results indicate that the structural response is sensitive to the configuration of sandwich structures. Based on the experiments, corresponding finite element simulations have been undertaken using the LS-DYNA software. A good agreement has been obtained between the numerical and experimental results. The deformation and failure modes of sandwich beams under impact loading are presented, i.e. large inelastic deformation, core compression and core shear with interfacial failure. Numerical results also show that the velocity-time histories of the mid-span of the front and back sheet of sandwich beams are related to not only core strength but also core thickness. The research results are of worth to the theoretical prediction of the dynamic response of metallic sandwich beam.

A numerical simulation of metallic cylindrical sandwich shells subjected to air blast loading

“…Automatic, surface-to-surface contact options were generally used. It should be pointed out that the analyses of the effect of element size on the structural response of sandwich shells were omitted in this study since the similar/same methods was employed in some previous studies and a good agreement was obtained comparing with that of experimental results [7,17,18]. The standard quasi-static tests were conducted for LY-12 aluminum alloy face-sheet and aluminum foam core material in the corresponding experimental investigations [19,20] to obtain the cor-responding mechanical parameters.…”

“…Preliminary studies [5,7,9,11] show that the center-point deflection of sandwich structures is reduced by increasing the face-sheet thickness, core thickness and relative density and this however leads to an increase in the structural weight. How to make a compromise between strength and weight is one of the most important issues that need to be considered in the design of sandwich structures.…”

“…The sandwich structure is a special topology form comprising a combination of different materials that are bonded to each other so as to utilize the properties of each component for the structural advantage of the whole assembly. Potential advantages of sandwich beams or panels with two metallic face-sheets and a cellular metal core over solid structures of equal mass under intensive impact/blast loadings have been massively studied in the literatures [4][5][6][7][8][9][10]. Typical deformation and failure modes, such as face-sheet yield, core compression and shear, …”

An experimental and simulation study of impact resistance in sandwich structures casing

“…According to the research carried out by Edison et al, 16 the surface using PEG-400 offers a very promising method for depositing micro-and nano-fillers on Kevlar surface to enhance ballistic impact performance of the hybrid laminate. The high-velocity impact response of a range of novel aluminum foam sandwich structures has been investigated using a nitrogen gas gun by Villanueva and Cantwell, 17 Jing et al, 18 Lopatnikov et al 19 Radford et al 20 investigated the dynamic response of the clamped sandwich beams and planes by impacting the beams at mid-span with metal foam projectiles.…”

Numerical Study on the Projectile Impact Resistance of Multi-Layer Sandwich Panels with Cellular Cores

“…It makes the study of the projectile impact resistance of sandwich components a significant task. Much theoretical, numerical and experimental work in dynamic properties including projectile impact resistance of sandwich structures with cellular cores has been taken (Zhu, et al, 2008;Jing, et al, 2011;Yin, et al, 2013;Ni, et al, 2013;Zhang, et al, 2013;Su, et al, 2013;Fan, et al, 2014;Jiang, et al, 2014;Ebrahimi et al, 2016). Liaghat et al (2010) introduced an analytical model based on energy method to predict the ballistic limit of metallic honeycombs.…”