Out-of-Autoclave Prepreg Processing
Résumé
The objective of this chapter is to provide an overview of the processing aspects of out-of-autoclave (OOA) prepregs. This chapter serves as a design guideline for the definition of tooling, bagging configuration, and processing conditions for making parts with OOA prepregs. Section 1 presents an overview of the OOA materials, including their application, resins, and fibers. OOA prepreg impregnation techniques are then discussed and typical properties of OOA composites are summarized. Section 2 covers OOA prepreg characterization methods, techniques to measure resin impregnation, thermochemistry, out-time, permeability, and bulk factor are presented. Section 3 describes the infrastructure used to cure OOA prepregs, such as ovens, heating systems, tooling, and process diagnostic tools. Section 4 provides basic processing guidelines, covering bagging configuration, debulking methods, and cure cycles to make simple monolithic OOA laminates, while Sections 5 and 6 provide processing guidelines for sandwich panels and complex shape laminates. The cost analysis of the manufacturing process with OOA prepregs is reviewed in section seven. Finally, section eight discusses future developments for OOA prepreg materials and processes.
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