Thermoset Polymer Composites Research Articles

The Continuous Cuing Process for Thermoset Polymer Composites. Part 1: Modeling and Demonstration

This paper presents a new manufacturing method, continuous curing, that is specifically engineered for extremely thick parts made from thermosetting polymer matrix compounds. In this process, matrix curing takes place continuously as the precursor material is being laid down. The energy for curing is obtained from the exothermic curing reaction through controlled heat release; once started, the process is self-sustaining. Thermal spiking, an unavoidable feature of autoclave curing, can be completely eliminated in continuous curing by manipulating the process parameters. In addition, manufacturing times are reduced by an order of magnitude or more. A simple analytical model is presented first to show the inherent features of continuous curing. Next, a detailed thermo-chemical process model is developed and numerical results are obtained for a glass/polyester composite. The process is demonstrated by curing a 100 mm thick graphite/epoxy lamina. Finally, thermal spiking behavior and manufacturing times are compared for conventional autoclave curing and continuous curing.

Computer-controlled compression molding system for composite processing

A simple, inexpensive yet flexible compression molding and cure monitoring system has been developed and used in studying the processing of advanced polymer composites. Compression molding is a promising method for manufacturing thermoset polymer composites which find usage in aerospace applications. The processing history of these composites determines their final properties. To improve quality and enable mass production, the processing-property relations need to be studied in detail. Process control and process monitoring as well as provision for user intervention during processing is essential in studying such problems. The computer-controlled molding system together with the control and data acquisition software aims at demonstrating how such a system may be built from off-the-shelf components.

The State of the Art of Toughening Efforts of Thermoplastic and Thermosetting Polymer Composites

The State of the Art of Toughening Efforts of Thermoplastic and Thermosetting Polymer Composites