Experimental investigation on the yield behavior of Nomex honeycombs under combined shear-compression

Abstract

This paper presents an experimental investigation on the yield behavior of Nomex honeycombs under combined shearcompression with regard to out-of-plane direction. Four different types of specimens were designed in order to investigate the influence of in-plane orientation angle on the yield behavior of honeycombs under combined loads. Two different failure modes of honeycomb specimens, i.e. the plastic buckling and the extension fracture of cell walls, are observed under combined shear-compression. The experimental results validate that the in-plane orientation angle has a significant influence on the developments of the experimental yield surface. The experimental yield surfaces are compared with a phenomenological yield criterion capable of accounting for anisotropic behavior. The comparative analytical results indicate the experimental yield surfaces are approximately consistent with the theoretical yield surfaces in the normal-shear stress space. These experimental results are useful to develop constitutive models of Nomex honeycombs under combined shear-compression.

Dynamic crushing of uniform and density graded cellular structures based on the circle arc model

“…Considerable experimental and numerical studies have been conducted to investigate the dynamic behavior of cellular structures Wang et al, 2006;Zhou et al, 2012;Wang et al, 2011;Chen et al, 1999;Tan et al, 2005;Masters and Evans, 2009;Blawi and Abot, 2008;Xu et al, 2012). The deformation, crushing stress and energy absorption as well as the cell geometric topology of the uniform cellular structures have been studied systematically.…”

Impact Response of Aluminium Alloy Foams Under Complex Stress States

“…Therefore, it is essential to model accurately the multiaxial failure behavior of the metallic foams under impact loading conditions, especially combined shear-compression which is the most realistic loading mode. The previous researches involving the dynamic mechanical property of the foams have been mostly limited to the uniaxial mechanical behavior, such as uniaxial failure strength, the plateau stress, the densification behavior and the energy absorption capacity (Zhao, 1997;Deshpande and Fleck, 2000b;Zhou et al, 2004a;Zhou et al, 2004b;Demiray et al, 2006; Latin American Journal of Solids and Structures 13 (2016) 665-689 Doyoyo and Mohr., 2006;Yu et al, 2006;Peroni et al, 2008;Peroni et al, 2012;Zhou et al, 2012aZhou et al, , 2012bZhou et al, , 2014Hangai et al, 2013;Pichler and Lackner, R.,Duarte et al, 2014;Kaya and Fleck, 2014;Li et al, 2014;Alvandi-Tabrizi et al, 2015;Storm et al, 2015;Vesenjak et al, 2016). But experimental investigations of metallic foams under dynamic multiaxial loading condition are not available by now.…”

“…Many works have been performed to study the rate effect in the mechanical behavior of the metallic foams, such as the uniaxial failure stress, the plateau stress, the densification behavior and the energy absorption capacity (Zhao,1997;Deshpande and Fleck, 2000b;Demiray et al, 2006;Yu et al, 2006;Zhou et al, 2012aZhou et al, , 2012bZhou et al, , 2014Castroa et al, 2013;Alia et al, 2014;Goel et al, 2014;Wang et al, 2014;Kishimoto et al, 2014;Caprino et al, 2015;Storm et al, 2015;Su et al, 2015). Nevertheless, little literature has involved the experimental failure surface, especially the dynamic failure surface which is very important for the engineering applications of the metallic foams.…”

A numerical study on the impact behavior of foam-cored cylindrical sandwich shells subjected to normal/oblique impact

“…honeycombs or polymer (Deshpande and Fleck, 2000;Zhou et al, 2012a;2012b;Shen et al, 2010a). The performance of sandwich structures with an aluminium foam core and aluminium alloy sheets under low and high-velocity impact loading were analyzed by various experiments and numerical simulations.…”