Compression Constitutive Modelmodel and Analysis of Properties of Poplar Veneer Roll Pressing
Poplar veneer is an effective way of high value utilisation through the preparation of recombined materials by curling and rolling,and clarifying the curling and rolling force characteristics of poplar veneer and the ontological model is the basis of roll forming.On the basis of the porous material mechanical constitutive model which can ex-press the mechanical properties of poplar wood under pressure,the roll pressure model of poplar wood veneer is pro-posed by analysing the force of poplar wood veneer in the process of roll pressing.In order to determine the unknown parameters of the mechanical model and verify the applicability of the model to the compression characteristics of poplar veneer,a calibration test of poplar veneer under compression was carried out,and the correlation coefficient between the model and the curve fitting was 0.994 1,which can characterise the correspondence between stress and strain,and is used for the expression of veneer roll pressure in the subsequent measurement test.The force change of veneer curling roll pressing process was simulated by ADAMS,and the strain signal of roll forming was collected by using Donghua DH5908 wireless dynamic strain test acquisition system,and the error between the test value and the simulated value was between 4％and 8％,which verified the validity of the mechanical simulation analysis and the mechanical model.The results of the study can provide an important basis for the process control and numerical anal-ysis of veneer curling roll forming.
万方数据
维普
