Abstract: The forming quality of composite materials is influenced cooperatively by the environment of autoclave curing process and physical and chemical reaction inside of component. The majority of the existing monitoring methods used to monitor the curing process are offline and discrete. Those methods bring about a heavy workload of subsequent data processing and the difficulty in detecting the interior change in the parts directly, making it hard to realize the online feedback control of the molding quality. Moreover, the amount of physical quantities detected is so small that the interaction among physical quantities cannot be comprehensively studied. In order to achieve the multi-parameter collaborative on-line monitoring of advanced composite materials forming process, in this paper, a kind of combined measurement method based on the classical laminated plate theory, "thermocouple+optical fiber Bragg grating" and "capillary pressure sensor" is introduced and a set of online monitoring PC software system using LabVIEW graphical programming language, data communication and database technology is developed, which have realized the synchronous online data communication and the synergy among temperature, pressure, strain and stress. The curing experiment of shrinkage part of a large aircraft wing box wall have corroborated the feasibility of the real-time monitoring for multi-parameters of the whole process of composite materials forming by the monitoring system and the stability and reliability of the system, which are of practical significance for ascertaining the mechanism of curing defects generated and realizing the online feedback control.

Key words: composite materials, hot pressing process, multi-parameter collaborative, on-line monitoring, data communication