Study on the Compressive Mechanical Properties of Reinforced Re-Entrant Honeycomb

In order to solve the problem of insufficient strength caused by high porosity of traditional honeycomb structures, a new type of reinforced negative Poisson′s ratio re-entrant honeycomb structure is proposed by embedding a double diamond-shaped reinforced structure in the traditional re-entrant honeycomb structure to improve the compressive mechanical properties of the honeycomb structure. Based on the unit load method, a theoretical model of the equivalent parameters of the reinforced re-entrant honeycomb structure was established, and the equivalent Poisson′s ratio and equivalent elastic modulus of the cellular element of the reinforced negative Poisson′s ratio re-entrant honeycomb structure were studied by using the finite element method, and the accuracy of the model was verified by comparing with the results of the theoretical model. The energy absorption characteristics and deformation modes of the reinforced negative Poisson′s ratio re-entrant honeycomb structure under compressive load are analyzed, and the results show that due to the supporting effect of the diamond-shaped structure, the reinforced negative Poisson′s ratio re-entrant honeycomb structure significantly improves the stiffness and energy absorption performance while maintaining the negative Poisson′s ratio characteristics of the structure, which is mainly manifested in the higher platform stress and total energy absorption of the reinforced honeycomb structure, which are 75.1% and 45.5% higher than the traditional re-entrant honeycomb structure, respectively. The results of this paper show that the mechanical properties of the structure can be effectively improved through reasonable structural design, which has certain reference significance for the design and optimization of negative Poisson′s ratio structures.