Eddy current methods for the examination of carbon fibre reinforced epoxy resins
Abstract
Unusual phenomena associated with nondestructive eddy current examination of carbon fiber-reinforced polymers with nonconducting matrices are described. A theory relating fiber volume fraction to the measured electrical properties is derived. Results of tests for fiber volume fraction, fiber orientation, and cracks in the composite are provided. Highest attainable working frequency is required to achieve good spatial resolution when locating cracks. It is shown that the eddy current method is primarily sensitive to variations in the fiber lay-up and constitutes a simple tool for locating failure sites in a composite material.
- Publication:
-
Materials Evaluation
- Pub Date:
- November 1976
- Bibcode:
- 1976MatEv..34..237O
- Keywords:
-
- Carbon Fiber Reinforced Plastics;
- Eddy Currents;
- Electrical Measurement;
- Epoxy Resins;
- Nondestructive Tests;
- Cracks;
- Electrical Resistivity;
- Equivalent Circuits;
- Fiber Orientation;
- Network Analysis;
- Test Equipment;
- Instrumentation and Photography