NDE of Ceramic Matrix Composites for Radomes. Part 1. Program Description and Analytical Studies.
Abstract
Variations in porosity and/or reinforcement content were found to be the major anomalies. which influence the dielectric property as well as stiffness and strength of ceramic matrix composites being considered for next generation radomes as well as other applications. Analyses and experiments conducted showed that such variations can be quantified using ultrasonic as well as microwave NDE. The latter method yields a measure of the changes in the dielectric constant, whereas the first measures the changes in the sound wave velocity (or attenuation) due to the porosity variations. Simple results for two-phase composites as well as those based on experimental data for the material tested were suggested for relating velocity change to porosity and for obtaining analytical estimates of dielectric property variations. The Radome Analysis Computer Program (RACP(TM)) was modified to estimate the changes in boresight errors and monopulse antenna receiving patterns for radomes with porous regions with reduced dielectric constant. The inspection system and suggested assessment methods should be useful for practical applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1997
- Accession Number
- ADA365087
Entities
People
- Chian-fong Yen
- Dominic Mirto
- Sailendra N. Chatterjee