Abstract
Ultrasonic techniques utilizing a pair of transducers in a combination of pulse-echo and through-transmission modes were developed. Two types of methods were discussed for determination of material attenuation in composites: direct or absolute methods for materials with low signal loss, and indirect or relative methods for materials with higher signal loss. In all cases, transfer functions of the transducers and specimen surfaces were taken into consideration so that the measurement system is self-calibrated. Void content was measured by means of microscopic image analysis of photomicrographs of the specimen cross-sections and a correlation of material attenuation with porosity was established.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Journal of Nondestructive Evaluation |
| Volume | 11 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 1 1992 |
Keywords
- Composite materials
- graphite/epoxy
- image analysis
- porosity
- ultrasonic attenuation
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering