Simulation of unsteady temperature profile during CFRP pultrusion and detection by FBG

The pultrusion of the carbon fiber reinforced plastics (CFRP) is a dynamic process. The degree of cure and temperature are coupled during this process. According to the curing kinetics and the heat transfer theory，the models of unsteady temperature filed and curing were established. The kinetic parameters used to predict the temperature profile were obtained from differential scanning calorimetry (DSC). The finite element method and finite difference method were combined，and the indirect decoupling method based on ANSYS was adopted to simulate the temperature profile in FRP during pultrusion. The fiber Bragg grating (FBG) was encapsulated in an aluminum capillary in order to exclude the non-temperature influence. The feature and the temperature sensitivity coefficient were acquired through experiment to guarantee the accuracy of the real time temperature detecting. The simulative result is in good agreement with the experimental one. The simulative method makes convenience for the optimization of technology parameters of pultrusion and takes the place of the traditional trial-and-error method.