Conception of multifunctional sandwich-ply laminated composites and structural implementation through woven lattice sandwich layups

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Conception of multifunctional sandwich-ply laminated composites and structural implementation through woven lattice sandwich layups

Wang, Ben / Luo, Bailu / Yan, Qu / Yang, Yunze / Fan, Hualin

Abstract Integrating constructions and advantages of laminate and sandwich, this paper proposed the conception of sandwich-ply laminated composite (SLC) for multifunctional applications. Applying woven lattice sandwich (WLS) composite as lamina, SLC panels were designed and manufactured. The microwave transmission of WLS lamina and SLC panels was measured and compared in the band of 8 GHz to 18 GHz. Results indicate that WLS lamina shows excellent transmission characteristics while the reflection and refraction caused by the multiple faces lead to a decrease in the transmission performance of SLC panels. Flatwise compression, edgewise compression, and three-point bending experiments were conducted to investigate the mechanical properties and behaviors of SLC panels. Results show that the flatwise compressive strength of SLC panels reaches 10.3 MPa. Coupling damage patterns of shear buckling and delamination, flexural buckling and delamination, shear failure and delamination, and face fracture and delamination, were revealed in edgewise compression and three-point bending experiments. The woven texture of the face of WLS lamina leads to different interfacial bonding strengths in two layup orientations of SLC panels and induces various mechanical behaviors. SLC panels with the layup of [Wt]5 have better mechanical performances. The proposed SLC panels exhibit excellent load-bearing and lightweight performances, feasible structural designability, and potential multifunctional performances.