Research on Advanced NDE (Nondestructive Evaluation) Methods for Aerospace Structures.
Abstract
This report describes the development of new methods of ultrasonic nondestructive evaluation (NDE). Ultrasonic backscatter imaging and imaging using leaky surface waves are applied to locating defects in advanced fiber-reinforced composite materials. High speed digitizers are used to acquire the RF signals of interest and B-scan and C-scan images are generated using a high-precision, automated scanning system developed during this program. Defects such as matrix cracks, multi-level delaminations, ply cuts, and simulated porosity are identified in graphite/epoxy composite samples. Image analysis and digital image enhancement techniques are developed and applied to the digitized images to improve defect detection. Global and local spatial domain image operators are successful in improving spatial resolution and defect detection. Initial results of image segmentation efforts to isolate defects are encouraging.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1987
- Accession Number
- ADA182199
Entities
People
- Brian G. Frock
- Edward L. Klosterman
- Jeffery A. Fox
- Richard W. Martin
- Robert J. Andrews
Organizations
- University of Dayton