Direct measurements of non-linear stress-strain curves and elastic properties of metal matrix composite sandwich beams with any core material

Three-point bending deflection and failure mechanism map of sandwich beams with second-order hierarchical corrugated truss core

“…However, this leads to the fact that these existing theories cannot correctly describe the behavior of sandwich structures with strong facesheets and weak cores under bending [14]. On this account, several attempts have been made to modify and improve these classic theories [15][16][17]. Specifically, the mechanical model of sandwich struts was further improved by implementing the structural theory based on the zigzag warping and a higher order bending theory, the so-called Reddy-Bickford Theory (RBT), which releases the constraint of plane-section assumption and allows nonlinear in-plane deformations to develop in the core [15,16].…”

“…On this account, several attempts have been made to modify and improve these classic theories [15][16][17]. Specifically, the mechanical model of sandwich struts was further improved by implementing the structural theory based on the zigzag warping and a higher order bending theory, the so-called Reddy-Bickford Theory (RBT), which releases the constraint of plane-section assumption and allows nonlinear in-plane deformations to develop in the core [15,16]. The analytical structural models were demonstrated to be accurate for a limited range of relative stiffness between core and skins, or sandwich heterogeneity [17].…”