Study On Mechanical Properties And Constitutive Model Of Vertical Corrugated Paperboard

Vertical corrugated composite paperboard refers to honeycomb paperboard core structure,which changes the traditional corrugated paperboard horizontal arrangement,is a new environmental protection packaging naterial.Vertical corrugated composite cardboard as so as honeycomb cardboard,can be used as cushioning and energy-absorbing packaging materials in the process of crop flow.When loaded.it can deform steadily under almost constant load and absorb a large amount of energy.Thus,it can protect the product from damage when the package drops and impacts.In this paper,the static and dynamic compression properties of vertical corrugated composite paperboard are studied by combining experimental study,constitutive model and finite element simulation.Then the constitutive model equations are obtained.Firstly,the static compression and dynamic impact tests of different corrugated laminates(A,B.AB)and different thickness(10mm,15mm,20mm,30mm)under the same temperature and humidity environment were carried out by using electronic universal testing machine and material impact testing machine.Using MATLAB software to analyze the influence of corrugated type and thickness on the compressive performance of vertical corrugated composite board.The smaller the corrugated height,the smaller the thickness,the stronger the endurance capacity of the board,the higher the peak stress and the platform stress.The same test was done for the same amount of paper made of honeycomb paperboard.Compared the strength differences between the two paperboards,it found that the vertical corrugated composite paperboard compression process is similar to honeycomb paperboard,there are four stages of theoretical model.Secondly,a static constitutive equation is proposed based on the stress-strain data obtained from static compression.The parameters of the constitutive equation are identified by the least square method.Then considering the influence of strain rate,the strain rate influence function is proposed,and then the dynamic constitutive equation is obtained.In the subsequent tests,the strain rate is changed by changing the impact height,and the proposed dynamic constitutive equation is verified.It is found that the difference between the actual test results and the theoretical results is small.Finally,the static and dynamic compression process of vertical corrugated composite board was simulated by ANSYS Workbench finite element analysis software.Finite element model is established in SolidWorks software,then the model is imported into ANSYS Workbench,and the physical properties of vertical corrugated composite paper are set as model material parameters.The finite element model is meshed,loaded and constrained,and then the solver is solved.In ANSYS Workbench,the compression process of vertical corrugated composite paperboard can be observed,and the contact reaction force can be output.The stress-strain curve can be obtained after treatment.Compared with the stress-strain curve of the test and simulation,the two coincide well.