Time resolved shearographic and thermographic NDE methods for graphite epoxy/honeycomb composite
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering
- Johns Hopkins Univ., Laurel, MD (United States). Applied Physics Lab.
Results are presented showing the application of both time resolved thermography and time resolved shearography to specimens of graphite epoxy/honeycomb composites containing delaminations. Of particular importance is the demonstration that the depth of a defect can be determined by measuring the time dependence of the shearographic fringe development during heating. Upon application of a noncontacting heating source, large thermoelastic deformation in the heated region occurs over delamination regions in a specimen. The bending stresses in the material above the delamination decrease characteristically when the diffusing temperature field interacts with the delamination and the temperature gradient through the intact material decreases. As a result, both the presence of the delamination and its depth can be measured simultaneously.
- OSTI ID:
- 398297
- Journal Information:
- Materials Evaluation, Vol. 54, Issue 10; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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