Failure Modes of Foam Core Sandwich Beams under Static and Impact Loads

In recent times, sandwich structures have been widely used in load bearing structures due to their high specific stiffness and high specific strength. Some sandwich structures, such as those used in high speed transportations, are required to have high impact energy absorption characteristics also. Since sandwich structures can fail in various modes, in this article, the static failure modes and load capabilities of foam core composite sandwich beams composed of E-glass/Epoxy and PVC foam were investigated by both experimental and analytic methods. The static load capabilities and failure modes predicted by the theory of beam on elastic foundation showed good agreement with the three-point bending test results. Using the experimental and analytic results, the static failure mode map was constructed. Also, the impact failure modes and the impact energy absorption characteristics of the sandwich beams were studied by the impact test and the finite element analysis. From the test result, it was found that the face failure mode was favorable for the high impact energy absorption. Using the experimental and finite element analysis results, the impact failure mode map was constructed.

[1]  J. Vinson.  The Behavior of Sandwich Structures of Isotropic and Composite Materials , 1999 .

[2]  R. Mines,et al.  Numerical simulation of the progressive collapse of polymer composite sandwich beams under static loading , 2002 .

[3]  A. G. Gibson,et al.  Low velocity perforation behaviour of polymer composite sandwich panels , 1998 .

[4]  Chun-Gon Kim,et al.  Impact Resistance of Composite Laminated Sandwich Plates , 1992 .

[5]  Erdogan Madenci,et al.  Experimental investigation of low-velocity impact characteristics of sandwich composites , 2000 .

[6]  H. Park,et al.  Nonlinear Flexural Deflection of Thermoplastic Foam Core Sandwich Beam , 2002 .

[7]  Michael P. F. Sutcliffe,et al.  Indentation failure analysis of sandwich beams , 2000 .

[8]  A. Petras,et al.  Failure mode maps for honeycomb sandwich panels , 1999 .

[9]  Hui-Shen Shen,et al.  Nonlinear local response of foam-filled sandwich plates with laminated faces under combined transverse and in-plane loads , 2001 .

[10]  D. Zenkert,et al.  Handbook of Sandwich Construction , 1997 .

[11]  Jongman Kim,et al.  Design of sandwich structures for concentrated loading , 2001 .

[12]  Thomas K. Tsotsis,et al.  Indentation failure behavior of honeycomb sandwich panels , 2000 .

[13]  Wesley J. Cantwell,et al.  The low velocity impact response of foam-based sandwich structures , 2002 .

[14]  Ole Thybo Thomsen,et al.  Theoretical and experimental investigation of local bending effects in sandwich plates , 1995 .

[15]  Ronald E. Miller,et al.  Failure of sandwich beams with metallic foam cores , 2001 .

[16]  Lorna J. Gibson,et al.  Failure mode maps for foam core sandwich beams , 1987 .

[17]  Yeoshua Frostig,et al.  Stresses and failure patterns in the bending of sandwich beams with transversely flexible cores and laminated composite skins , 1996 .

[18]  B. Z. Jang,et al.  Instrumented Impact Testing of Composite Sandwich Panels , 1989 .

[19]  C. Kassapoglou,et al.  Wrinkling of Composite Sandwich Structures Under Compression , 1995 .