Holographic nondestructive testing of low-modulus materials
Abstract
A holographic nondestructive testing method based on mechanical loading is proposed for defect detection and characterization of low-modulus materials. Fringe spacing analysis is introduced which is based on the size and shape of a fringe anomaly obtained experimentally. The loading should produce a strain of about 300 x 10 exp -6. Fringe anomalies can be identified visually or by fringe-spacing analysis based on image-processing systems. A theoretical model of a long thin plate with a circular throughhole provides representative data for surface displacement disturbances around the throughhole.
- Publication:
-
Materials Evaluation
- Pub Date:
- September 1992
- Bibcode:
- 1992MatEv..50.1058R
- Keywords:
-
- Holographic Interferometry;
- Image Analysis;
- Loads (Forces);
- Nondestructive Tests;
- Surface Defects;
- Aerospace Industry;
- Diffraction Patterns;
- Stress Analysis;
- Thin Plates;
- Instrumentation and Photography