Enhanced mechanical performance of brazed sandwich panels with high density square honeycomb-corrugation hybrid cores

Abstract

A novel lightweight sandwich construction with square honeycomb-corrugation hybrid core (SHCH) was fabricated by honeycomb-corrugation assembly and vacuum brazing. The out-of-plane quasi-static compression behavior of the hybrid structures was explored in detail by experimental measurement, numerical calculation and theoretical prediction. The proposed brazed structures in high density region are found still to have strength and energy absorption capacity significantly greater than the sum of those of empty corrugated sandwich and square honeycomb-cored sandwich. In addition, the compressive strengths of the proposed square honeycomb–corrugation hybrid cores exhibit obvious superiority over those of competing core topologies in the high-density region. • Novel lightweight sandwich constructions with square honeycomb-filled corrugated hybrid cores are proposed. • The out-of-plane compressive behavior of the hybrid cores is enhanced. • Compressive stiffness, initial failure strength, and failure modes are predicted. • The strength and energy absorption capacity of honeycomb and corrugation in hybrid cores are significantly enhanced. • The compressive strengths of such hybrid cores exhibit obvious superiority in the high-density region.