Experimental and Numerical Study of Sandwich Structures with Bidirectional and Multilayer Cross Corrugated Core

In this paper, the quasi-static compressive strength of two different sandwich structure designs in which cores consist of trapezoidal corrugated panels is investigated. In one design, the core consists of a cross-corrugated multilayer structure, while in the other design the core is consists of two interlocking bidirectional cross-corrugated panels. For each design, three different trapezoidal wave profiles are studied and one of them is constructed and tested. The results of specimens' crushing tests under quasi-static compressive loads are compared with the numerical modeling results. Afterward, the mechanical behavior of the other four designs is evaluated numerically. The results showed that the ultimate strength of the sandwich structures with an interlocked corrugated core is higher than the ultimate strength of the other design. It was also found that, in a given design, the ultimate strength depends on the corrugation profile geometry. These results can be used in the design of high-strength light-weight structures. Measures that can be taken to improve the ultimate strength of sandwich panels include the use of polyurethane foam, which is light in weight but has high strength, or the geometry of the structure be changed.