Study On Out-of-plane Loading And Energy Absorption Performance Of Honeycomb Paperboard

In recent years,honeycomb paperboard with porous structure has been widely used in construction,logistics,transportation,packaging,energy absorption and other industries.When the honeycomb paperboard is subjected to the load in the out-of-plane direction,it’s load-bearing capacity,protection capability,and sound insulation capability are determined by compressive strength,cushioning performance,and energy absorption capability.However,the practical production process and the diversification of structural parameters is limited,which has led to the theoretical research progress and popularization of honeycomb paperboard is relatively slow.In this thesis,the finite element mechanical models of honeycomb paperboard under quasi-static,dynamic,drop impact and acoustic propagation are established,the response mechanism of honeycomb paperboard with different lattice structures was studied,and the accuracy of the model was verified by experimental methods,aimed to studying the load-bearing,cushioning and sound insulation performance of honeycomb paperboard in logistics and noise environments to improve its application value in packaging logistics and construction.The combination of experimental and finite element simulation is used to research the mechanical response and energy absorption performance of honeycomb paperboard,which provides an important basis and theoretical support for the engineering application and structural optimization of honeycomb paperboard,and also provides a reference for the structural innovation of honeycomb paperboard.The research content and main results of this thesis are as follows:(1)The finite element method simulation model with three lattice structures and three pore diameters of honeycomb paperboard under quasi-static compression load was established to investigate the quasi-static compression response and cushioning performance of honeycomb paperboard out-of-plane experimentally and theoretically,and to explore the influence of lattice structure and cell wall on the compression strength and cushioning coefficient of honeycomb paperboard.The experimental and finite element results indicate that the energy absorption capacity mainly in the elastic phase and the platform stages,and the out-of-plane loading capacity and the cushioning performance of honeycomb paperboard increases while the core paper cell wall is decreasing.(2)The finite element model of honeycomb paperboard lattice structure under dynamic impact load is established under three different impact energy,and the response and cushioning performance of honeycomb paperboard under out-of-plane hammer dynamic impact load were analyzed by experimentally and theoretically,and the effects of different impact energy on the compressive strength and cushioning coefficient of honeycomb paperboard was revealed.The experimental and finite element results indicate that under different impact energy,the peak stress is different in elastic stage,the smaller the impact energy,the smoother the corresponding acceleration curve,which reduces the damage degree of honeycomb paperboard.(3)The finite element model of honeycomb paperboard under out-of-plane dynamic impact was established based on the dynamic impact experiment.The response and cushioning performance of honeycomb paperboard under dynamic impact were studied by experimentally and theoretically.The effects of lattice structure and thickness on the impact strength and energy absorption of honeycomb paperboard were explored,and the stratification mechanism of paper and core paper under impact was revealed.(4)The finite element model of sound insulation of honeycomb paperboard is established through research the propagation mechanism of sound wave in honeycomb structure.The sound insulation performance of honeycomb paperboard with different thicknesses was studied by experiment and finite element simulation,and the sound transmission loss and the effective sound insulation range were simulated and compared with the experimental results.The results of the simulation data analysis and theory study are consistency,which verifies the accuracy and effectiveness of the model.