Resin flow during three-dimensional

In overcoming the shortcomings of the earlier models, Dave et al. [21,22] proposed a comprehensive three-dimensional consolidation and resin flow model that can be used to predict the following parameters during cure (1) the resin pressure and velocity profiles inside the composite as a function of position and time, (2) the consolidation profile of the laminate as a function of position and time, and (3) resin content profile as a function of position and time. 

Figures 15.11(a) and (b) describe the flow and cure of a B-staged aerospace adhesive during a complex thermal history, using parallel plate sensors. Specifically, Figure 15.11(a) shows how the loss factor (log e") changes with time and temperature. The increase in log e" between 25 and 80 °C is due to softening of the adhesive. As the temperature is held isothermally at 80 °C for 30 minutes, log e" remains constant. Then, between 60 and 75 minutes as heat is applied at a rate of 1 °C/min, temperature-induced fluidity causes the viscosity of the resin to decrease. After 75 minutes, the resin polymerises and develops a three-dimensional network, as indicated by the decrease in log e".

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