Comparison Of Tait、Schmidt And Renner Approaches Based On Experiments

In order to simulate the injection-moulding process of polymer materials,the knowledge and the modelling of their pressure-volume-temperature(pvT)behaviour is essential.This paper selected the most widely used polymer pvT behavior description models:Tait,Schmidt and Renner models as the research object.Based on the characteristics of the pvT model,a three-dimensional model comparison method is designed and the different models were analyzed from the perspective of statistical accuracy,model applicability and model generalizability of the models.The conclusion will provide a reference for the researchers to choose the model and make suggestions for the improvement of the model.In order to compare the statistical accuracy of the model,the pvT performance data of PA6 and PBT were measured.The data were fitted to Tait,Schmidt and Renner models,two programs are used in the fitting process,they provide the coefficients for each model.The RMSE,MAE and AICc values of the three models were calculated by MATLAB programming,and their goodness of fitting was analyzed in detail.Then previous work is used as an input for simulation.With the help of 3D-simulation software,the predictions of dimension and weight are obtained.The trails use the same processing parameters as the simulation for comparison with 100 parts of PA6 and PBT which are produced and measured.Finally,the applicability and stability of the model to different materials are summarized by comparing the two materials’ data and considering the fitting precision and simulation results.Through all the comparison,Renner shows the best performance.Regarding the modelling of pvT data,all three models show good fitting results.The simulation based on Renner approach gives the best result.