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Offers information on a study which determined the pulling force distribution in pultrusion. Theoretical background; Data and methods used; Findings and discussion.

Pulling force modeling and analysis in conventional pultrusion and Resin Injection Pultrusion (RIP) of vinylester resin were carried out in this study. Based on the friction coefficient value of liquid resin, an analytical model was developed to predict the resistance force in the injection die. A thermal expansion-polymerization shrinkage model and a friction coefficient model, combined with the temperature and resin conversion profiles along the die, were used to predict the resistance stress in the heating die, and to determine the composite separation point from the die wall. The simulation results were verified by the experimental data in the conventional pultrusion and RIP processes. The comparison shows that the models and the simulation tool developed in this study are capable of predicting the pulling force in the entire die with good agreement. [ABSTRACT FROM AUTHOR]