Insight into the shear behaviour of composite sandwich panels with foam core

Study on shear postbuckling failure of composite sandwich plates by a quasi-conforming finite element method

“…Therefore, to exactly predict the postbuckling behavior and progressive failure of composite sandwich plates is of importance in designing and maintaining composite sandwich structures [2]. So far, the shear postbuckling failure of composite plates [3] is investigated fewer than the compression case [4,5], and the most of the studies are contributed to laminated composite panels [6,7]. In fact, the postbuckling behavior of sandwich plates is often much more complicated than that of isotropic or laminated plates.…”

“…Numerical approaches, represented by finite element method and path following schemes combined with arc-length method, are widely used in nonlinear postbuckling M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 analysis of plate/shell structures. The scheme to trace the path of geometrically perturbed structures with an assumed initial imperfect is generally efficient at the simple bifurcation point of linear prebuckling states, but in more complex cases, the assumed imperfects may induce to trace non-actual paths.…”

Shear and mode II fracture of PUR foams

“…Most of the shear test results of foam materials from sandwich structures were obtained according with standard ASTM C273 [7]. Mostafa et al present the ultimate strength obtained in shear for PVC foam with density 100 kg/m 3 of 1.31 MPa, and for polyurethane foam with density 62 kg/m 3 of 0.413 MPa [8,9]. Jiang et al investigate the influence of chemical structure on the mechanical properties of rigid PVC foams of density 65 kg/m 3 , and found a ultimate shear strength value of 0.78 ± 0.03 MPa [10].…”

Experimental study on the mechanical properties of looped fabric reinforced foam core sandwich composite

“…Thus, the mechanical behavior of foam core sandwich structures has received a great attention. [4][5][6][7][8][9][10] Studies have been focused on optimizing the design of the composite structures 4 and understanding its mechanical behavior 5,6 under bending load, 7 shear load, 8 and torsion and flatwise compression. 9 A test method is proposed to evaluate the shearing modulus of foamed core used for sandwich structures.…”

“…However, those accurate predictions require consideration of the nonlinear response of the foam core. 8,16 In this article, the mechanical behavior of the rigid polyurethane foam (RPUF), the traditional 2D woven fabric reinforced foam sandwich composite (2DRFS), and the U-cor are experimentally investigated. Foam materials of different densities and two kinds of glass fiber yarn (the thick and thin fiber yarns or simply the thick and thin yarns) are considered.…”