Nondestructive Evaluation Using Fiber Gratings for "Strain Imaging"
Abstract
Arrays of multi-axis fiber grating sensors have been embedded into composite demonstration articles and used to support the identification and localization of both cut tow and Teflon tape defects. This presentation will overview the characteristics and performance of multi-axis fiber grating strain sensors to perform strain imaging and comparisons will be made to ultrasonic and eddy current techniques. Issues that will be addressed will include the distance over which damage may be detected via "strain imaging," "strain imaging" through successive composite layers, and "strain imaging" through optical fibers. Strain images from cut tow and Teflon tape defects are distinctly different. The embedded multi-axis fiber grating strain sensors may be used to monitor both global strain characteristics such as deformation of the cylindrical composite demonstration article under pressure as well as local damage events that may be impacts. This paper will report progress on multi-axis fiber grating strain imaging systems and future plans.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 13, 2004
- Accession Number
- ADA427012
Entities
People
- Eric Udd