Internal structural characterization
Abstract
The nondestructive evaluation (NDE) techniques most appropriated for the detection of a variety of defects in metal and ceramic matrix composites (MMC and CMC's) are described. The NDE techniques that were investigated for application to these materials include acoustic microscopy, ultrasonic pulse-echo, ultrasonic through-transmission, ultrasonic velocity, ultrasonic backscatter, ultrasonic surface wave velocity, ultrasonic surface wave attenuation, film radiography, microtomographic radiography, and dual-energy microtomographic radiography. Types of defects for which optimized techniques are summarized include delaminations, broken fibers, fiber spacing, fiber orientation, fiber/matrix interface, matrix cracks, and voids/porosity. Further NDE development is needed for these materials in the areas of basic development for other NDE modalities, advanced development for nondestructive material characterization, and the scale-up of proven NDE techniques for full scale components, to accommodate cost and geometry limitations.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- August 1992
- Bibcode:
- 1992STIN...9331982K
- Keywords:
-
- Ceramic Matrix Composites;
- Characterization;
- Cracks;
- Defects;
- Delaminating;
- Fiber Orientation;
- Metal Matrix Composites;
- Nondestructive Tests;
- Acoustic Microscopes;
- Backscattering;
- Radiography;
- Surface Waves;
- Tomography;
- Ultrasonic Radiation;
- Ultrasonics;
- Wave Attenuation;
- Quality Assurance and Reliability