Analysis Of Effect Of Humidity On Cushioning Performance Of Polyethylene Foam Reinforced Paper Composite Sandwich Laminate Structure

Polyethylene foam reinforced paper sandwich composite laminated structure consists respectively of two and three layers of paper corrugation,paper honeycomb and polyethylene foam,which is a composite laminate structure with excellent performance and has many applications in the field of cushioning and protective packaging.In this paper,the deformation patterns and cushioning energy absorption characteristics of three different composite laminates(paper corrugation/polyethylene foam,paper honeycomb/polyethylene foam,and paper honeycomb/polyethylene foam/paper corrugation)were analyzed by experiments and finite element comparison in dynamic drop impact tests under different relative humidity conditions.The main research of this paper includes:Firstly,the cushioning and energy absorption characteristics of the polyethylene foam reinforced paper composite sandwich laminate structure under different relative humidity drop impact conditions were analyzed.The dynamic drop impact test was conducted on the polyethylene foam reinforced paper composite sandwich laminate structure under different relative humidity drop impact conditions to analyze and summarize its deformation characteristics and patterns;the acceleration-time curve and stress and strain curve were plotted to analyze the impact resistance and strength characteristics of the structure;the cushioning energy absorption characteristics index was calculated to study.The influence of relative humidity on the composite laminate structure of polyethylene foam reinforced paper sandwich was investigated.The results show that,the peak acceleration of the polyethylene foam reinforced paper composite sandwich laminate structure under 80%relative humidity increases by 4%～12%and the impact duration reduces by 1%～8%compared with 70%relative humidity.The densification stress is lower under 80%condition,the peak stress increases,and the densification strain changes are relatively small;the energy absorption per unit volume decreases by 4%～32%under 80%condition,the total energy absorption and specific energy absorption also decreases,and the stroke utilization gradually increases but the change range is small.The range of change in stroke utilization is 0.1%～5.3%.Therefore,the mechanical properties of the polyethylene foam reinforced paper sandwich composite laminate structure are worse under 80%relative humidity.Secondly,the finite element analysis was made for the cushioning and energy absorption characteristics of the polyethylene foam reinforced paper composite sandwich laminate structure under different relative humidity and drop impact conditions.The solid modeling of the sandwich composite laminate structure was carried out in SolidWorks software,and three kinds of composite sandwich laminate structures were obtained:paper corrugation/polyethylene foam,paper honey comb/polyethylene foam,and paper honey comb/poly ethylene foam/paper corrugation;tensile tests were conducted on paper under different humidity conditions to obtain the parameters of paper substrate at different humidity;the polyethylene foam-reinforced paper sandwich laminate structure model was imported into HyperMesh software.The model was imported into HyperMesh software for meshing,material setting and attribute assignment;the model is imported into ABAQUS software for setting,and the finite element calculation and analysis results were obtained.Finally,the experimental results of drop impact of polyethylene foam reinforced paper composite sandwich laminate structure are compared with the finite element results,and the error range from-6.56%to 6.34%;the curve trend obtained from the finite element simulation is consistent with the test;the change law of buffer energy absorption characteristics under different relative humidity conditions is also the same as the test results,and the energy absorption per unit volume obtained from the finite element simulation is about The energy absorption per unit volume obtained from the finite element simulation is about 1.5～2.1 times of the experimental results.