CFRP Pultrusion Process Numerical Simulation And Analysis Of Thermal Strain

Processing parameters have a key influence on material properties, Industrial target is to get further improvement on product efficiency as well as product quality. However, it's difficult to improve their processing parameters. They need to experiment thousand of times to find the rules, to get the optimized parameters. Because of lacking theoretic support, traditional pultrusion process had to keep a empirical way. This usually cause low efficiency and high product cost. However, to build a theory system to predict the material properties change during pultrusion process is very important and needed.In order to simulate the whole pultrusion process, and get the approach on how does the processing parameters affect the material properties. This paper took the Carbon Fiber Reinforced Plastic(CFRP) as an example, on the basis of pultrusion characteristic and thermal conduction function together with curing kinetic theories, we built the CFRP Unstable Temperature Field Model, Curing Kinetic Model, Combined with the two Models, For the first time, we built the Continuous Forming Thermal Stress Model with complicated endogenous pyrogen. Then, the exothermic flux of epoxy was measured using differential scanning calorimetry (DSC). Next, we calculated the kinetic parameters used in the Kinetic Model. Finite Element Method (FEM) and Iterative Method were used to solve the strong coupling relationship between temperature and curing degree. This paper also used ANSYS software, wrote an APDL program to simulate the distribution of temperature, curing degree and thermal stress during pultrusion process in different processing parameters. Finally we analyzed the different contribution of processing parameters to material temperature and curing degree as well as thermal stress. Model founded can forecast the situation of material properties during the whole pultrusion process.Applied FBG(Fiber Bragg Grating) to continuous forming process creatively, sensing the temperature and strain variation dynamically during pultrusion in different processing parameters. We compare the simulation data with testing data, We found there are a great coincidence with the simulation data. This proved the Models and simulation programs were right. In the end, on the basis of testing data and simulation result, this paper got a conclusion on the different processing parameter, such as molding temperature and pulling speed etc. have an influence on product properties.According to the research of this paper, once we get the material parameters needed in the related models, We can predict the whole pultrusion process and the properties of CFRP. This model has a general theory basis, so it can also be used in various pultrusion process of materials. It had a great importance on the improvement of production efficiency and product quality.