Research On Concave Hexagonal Paper Honeycomb Structure And Its Energy Absorption Performance

Honeycomb paperboard is widely used in the field of transportation packaging due to its light weight and high strength.However,its weak in-plane load-bearing performance has become a major limitation for its engineering applications.In this paper,the geometry of honeycomb core was redesigned and a new concave hexagonal paper honeycomb structure was proposed,and its in-plane load-bearing performance under quasi-static load was investigated by a combination of experimental,numerical and theoretical methods.In addition,the plateau stress model and energy absorption model of concave hexagonal honeycomb paperboard in the X and Y directions were further developed by considering the tension-compression inequivalence of raw paper and environmental humidity.The main research contents include:(1)Study of the load-bearing capacity of concave hexagonal honeycomb cardboard under quasi-static loading.The results showed that the in-plane platform stress of concave hexagonal honeycomb paperboard was much higher than that of conventional honeycomb paperboard,and the out-plane platform stress was also higher than that of conventional honeycomb paperboard,with the same paper consumption per unit area.(2)Theoretical modelling of the stresses in the in-plane compression platform of concave hexagonal honeycomb cardboard.Considering the interaction between the face and core layers and considering the raw paper tensile and compressive inequalities,a theoretical model of the platform stress under compression within the face of concave hexagonal honeycomb paperboard was developed.A conformational correction factor related to the thickness of the honeycomb board was introduced to modify the theoretical model.Finally,the accuracy of the theoretical model developed above was verified through simulation studies.(3)The mechanism of the influence of ambient humidity on the compressive platform stress within the face of concave hexagonal honeycomb paperboard was revealed.Firstly,the variation of the mechanical properties of virgin paper with environmental humidity was studied and modelled.This model was then combined with the theoretical model of in-plane compression of concave hexagonal honeycomb cardboard in the standard condition,and the influence of ambient humidity on the interaction between the face and core layers was also taken into account to obtain the theoretical model of the platform stress in the X and Y directions of concave hexagonal honeycomb cardboard under arbitrary humidity conditions.(4)Optimised design for in-surface compression and energy absorption in concave hexagonal honeycomb cardboard.A theoretical model of energy absorption was developed,the main influencing parameters were analysed and a theoretical model of energy absorption in the direction of compression within the concave hexagonal honeycomb cardboard face was established with energy absorption capacity as the objective function and microstructural parameters as the optimisation target.Research shows that the maximum platform stress of the concave hexagonal honeycomb paperboard in the X direction can reach 403.67KPa;the maximum platform stress of the concave hexagonal honeycomb paperboard in the Y direction can reach 232.46 KPa.