| タイトル | Nondestructive ultrasonic characterization of two-phase materials |
| 本文（外部サイト） | http://hdl.handle.net/2060/19870016926 |
| 著者（英） | Salama, Kamel |
| 著者所属（英） | Houston Univ. |
| 発行日 | 1987-01-01 |
| 言語 | eng |
| 内容記述 | The development of ultrasonic methods for the nondestructive characterization of mechanical properties of two phase engineering materials are described. The primary goal was to establish relationships between the nonlinearity parameter and the percentage of solid solution phase in two phase systems such as heat treatable aluminum alloys. The acoustoelastic constant was also measured on these alloys. A major advantage of the nonlinearity parameter over that of the acoustoelastic constant is that it may be determined without the application of stress on the material, which makes the method more applicable to inservice nondestructive characterization. The results obtained on the heat treatable 7075 and the work hardenable 5086 and 5456 aluminum alloys show that both the acoustoelastic constant and the acoustic nonlinearity parameter change considerable with the volume fraction of second phase precipitates in these aluminum alloys. A mathematical model was also developed to relate the effective acoustic nonlinearity parameter to volume fraction of second phase precipitates in an alloy. The equation is approximated to within experimental error by a linear expression for volume fractions up to approx. 10%. |
| NASA分類 | QUALITY ASSURANCE AND RELIABILITY |
| レポートNO | 87N26359
NASA-CR-180694
NAS 1.26:180694 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/149617 |
