Abstract:Based on heat transfer theory, mechanics of composite materials and cure kinetics, the temperature,
degree, reaction rate of cure and thermal stress in the composite helicopter blade’s curing process under the recommended
temperature cycle of F650 bismaleimide resin are calculated. The strong coupling multi-physics finite element
method for solving partial differential equation is applied in this paper. The result shows that during the curing
process, the curing reaction of resin is highly synchronized, and the exothermic crosslinking reaction is faint; compared
with the recommended heating cycle, the highest heating temperature lowers from 460 K to 393 K in the adjusted
heating cycle, but the reaction time of the curing degree from 0. 1 to 1 only increases from 25 to 30 min, the peak
value of the curing reaction rate decreases from 1. 35×10-3 / s to 1. 15×10-3 / s,and the maximal thermal stress in the
PMI foam drops from 0. 82 MPa to 0. 482 MPa.
