Damage Mechanisms in Polymer Matrix Composites in Extreme Environments

摘要

In this work, potential problems with the application of polymer matrix composites (PMC) in extreme environments is discussed. Then, two specific examples of the applications of PMCs in high voltage and high temperature situations are evaluated. The first example deals with damage evolution in high voltage composite insulators with PMC rods subjected to a combined action of extreme mechanical, electrical and environmental stresses. These insulators are widely used in transmission line and substation applications around the world. Subsequently, advanced high temperature graphite/polyimide composites are evaluated for aerospace applications. The composite investigated in this project were used to manufacture and successfully test a Rocket Based Combined Cycle (RBCC) third-generation, reusable liquid propellant rocket engine, which is one possible engine for a future single-stage-to-orbit vehicle.