Measuring changing strain fields in composites with Distributed Fiber-Optic Sensing using the optical backscatter reflectometer

作者：Grave Jon Harald L^*; Haheim Magnus L; Echtermeyer Andreas T

来源：Composites Part B: Engineering , 2015, 74: 138-146.

DOI：10.1016/j.compositesb.2015.01.003

• Debonding
• Non-destructive testing
• Joints
• Distributed Fiber-Optic Sensing

Background/purpose: Measurements of strains in critical components are often required in addition to finite element calculations when evaluating a structure.
Methods: This paper describes how standard optical fibers, bonded to the surface or embedded in a laminate, can measure strain fields along the entire length of the fiber, using the optical backscatter reflectometer.
Results: A strain field measurement can be much better compared to simulations than the more common single point measurements with strain gauges or Bragg Gratings. Changes of the strain field can be related to damage development and can be used for structural health monitoring. Practical aspects of using the fibers are also discussed.
Conclusion: Distributed Fiber-Optic Sensing was successfully embedded and bonded to a composite joint. Adhesive damage was identified and the strain field agreed well with FE-Analysis.

• 出版日期2015-6-1