Monitoring for residual strain of resin cure during the process of RTM composites

The monitoring system of fiber Bragg grating for the RTM curing process was established. The real time monitoring for residual strain induced by resin cure during the RTM process was realized by measuring the relationship among wave deflection, temperature and curing time. The result shows that the relationship between the residual strain and the temperature change is approximately linear during the process of cooling, which supplies experimental support for the residual stress analysis of composite plate.