Core materials play a critical role in sandwich structures by acting as the central support layer between two thin, strong face sheets. The main purpose of the core is to separate the outer skins and maintain the structural shape of the panel while keeping the overall weight low.
When a sandwich panel is subjected to bending loads, the face sheets carry the tensile and compressive stresses, while the core material resists shear forces and stabilizes the structure. This design dramatically increases stiffness and strength compared with a solid laminate of the same weight.
Typical core materials include structural foam cores such as PVC, PET, PMI, and PU foam, as well as honeycomb cores made from polypropylene, aluminum, or aramid materials. These cores are engineered to provide high shear strength, excellent fatigue resistance, and low density.
Sandwich structures using core materials are widely used in wind turbine blades, boat hulls, aircraft interiors, refrigerated trucks, rail vehicles, and lightweight building panels.
