| タイトル | Theory and experimental technique for nondestructive evaluation of ceramic composites |
| 本文（外部サイト） | http://hdl.handle.net/2060/19900014438 |
| 著者（英） | Generazio, Edward R. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1990-01-01 |
| 言語 | eng |
| 内容記述 | The important ultrasonic scattering mechanisms for SiC and Si3N4 ceramic composites were identified by examining the interaction of ultrasound with individual fibers, pores, and grains. The dominant scattering mechanisms were identified as asymmetric refractive scattering due to porosity gradients in the matrix material, and symmetric diffractive scattering at the fiber-to-matrix interface and at individual pores. The effect of the ultrasonic reflection coefficient and surface roughness in the ultrasonic evaluation was highlighted. A new nonintrusive ultrasonic evaluation technique, angular power spectrum scanning (APSS), was presented that is sensitive to microstructural variations in composites. Preliminary results indicate that APSS will yield information on the composite microstructure that is not available by any other nondestructive technique. |
| NASA分類 | QUALITY ASSURANCE AND RELIABILITY |
| レポートNO | 90N23754
NAS 1.15:102561
E-5381
NASA-TM-102561 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/137584 |
