Detection of Localized Heat Damage in a Polymer Matrix Composite by Thermo-Elastic Method (Preprint)
DAYTON UNIV OH RESEARCH INST
Pagination or Media Count:
Reduction of strength of polymer matrix composites when exposed to high temperatures is a major concern in aerospace industry. Loss of mechanical strength can be measured only through established destructive techniques there is a need for detection and evaluation of heat damage in PMC. This paper describes a thermo-elastic based non-contact nondestructive technique for detection and evaluation of heat damage in PMC. The efficiency of the material to convert acoustic energy into heat is used as a means to detect and evaluate the heat damage in the material. A panel subjected to local heat damage at several locations is tested using air coupled ultrasonic C-scan and thermo-elastic measurements. The results show that the ultrasonic C-scan detects only the major damage. On the other hand the thermo-elastic method detects both high and low level heat damages in the panel. The efficiency of the conversion of acoustic energy into heat, in undamaged and damaged regions and its role in detecting damage are discussed.
- Laminates and Composite Materials