Preparation and performance analysis of a novel double-layer sandwich composite structure

Abstract

In this paper, a novel double-layer sandwich composite structure was designed based on the synergistic integration of a trapezoidal corrugation (TC) core and a double arrow (DA) core. A combination of experiment and simulation was employed to analyze the flexural performance of the new sandwich structure and reveal its unique failure mechanism. As the double-layer sandwich composite structure containing trapezoidal corrugation & double arrow (C&A) core was able to avoid large bending deformation through the stiffness advantage of the lower DA core and reduce the debonding damage between the core and the panel, the upper TC core was capable of absorbing energy stably through core collapse under bending loads. Results showed that the load-displacement curve of the double-layer sandwich structure with C&A cores experienced two load peaks with increasing displacement, and the later peak was higher than the first peak, and when compared with the two single-layer sandwich structures with TC core and DA core, the load efficiency of the double-layer sandwich structure was improved by 164.53% and 185.49%, while the specific energy absorption was improved by 87.43% and 71.40%, respectively.