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Experimental Mechanics

, Volume 31, Issue 2, pp 98–103 | Cite as

Micro-interferometry for measurement of thermal displacements at fiber/matrix interfaces

  • N. R. Sottos
  • W. R. Scott
  • R. L. McCullough
Article

Abstract

A micro-interferometric technique for measuring out-of-plane thermal displacements on a scale commensurate with the dimensions of the fiber/matrix unit cell is described. A scanning micro-interferometer is used to image surface displacements of samples containing a single-pitch-based carbon fiber embedded in an epoxy matrix. The interferometer design gives the necessary resolution to detect small changes in thermal displacements in the fiber/matrix interface region. The samples were heated electrically through the fiber to create radially symmetric temperature and displacement fields. Repeatable displacement measurements were obtained on a radial line across the interface region with an accuracy of ±25 Å. A sharp expansion of the matrix surrounding the fiber was observed with each heating. Overall, the experiments demonstrate the utility of micro-interferometry for measuring submicron displacements.

Keywords

Epoxy Mechanical Engineer Fluid Dynamics Carbon Fiber Displacement Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Cox, B.N., Morris, W.L. and James, M.R., “High Sensitivity, High Spatial Resolution Strain Measurements in Composites and Alloys,” Proc. Nondestr. Test. and Eval. of Advanced Mat. and Comp. Conf., 25–39 (1986).Google Scholar
  2. 2.
    Morris, W.L. and Cox, B.N., “Thermal Fatigue of Unidirectional Graphite Composites,” Proc. 6th Int. Conf. on Comp. Mat., ed. F.L. Matthews, N.C.R. Buskell, J.M. Hodgkinson, and J. Morton,4,344–352 (1987).Google Scholar
  3. 3.
    Morris, W.L., Inman, R.V. andCox, B.N., “Microscope Deformation in a Heated Unidirectional Graphite-epoxy Composite,”J. Mat. Sci., 24:199–204 (1989).CrossRefGoogle Scholar
  4. 4.
    James, M.R., Morris, W.L. andCox, B.N., “A High Accuracy Automated Strain Field Mapper,”Experimental Mechanics,20 (1),60–67 (March1990).Google Scholar
  5. 5.
    Scott, W.R., Huber, S. andRyan, M., “An Image Scanning Heterodyne Microinterferometer,”Rev. of Progress in Quantitative Nondestr. Eval., Plenum Press, New York,7B,1065–1073 (1988).Google Scholar
  6. 6.
    Scott, W.R., Ryan, M.J., Granata, D.M. and Sottos, N.R., “Nondestructive Evaluation and Characterization of Composite Materials Microinterferometry,” 1st Navy Independent Research/Independent Exploratory Development Symp., CPIA Publication 492,1,481–491 (1988).Google Scholar
  7. 7.
    Huber, S., Scott, W.R. andSands, R., “Detection and Analysis of Waves Propagating in Boron/Aluninum Composite Materials,”Rev. Progress in Quantitative Nondest. Eval., Plenum Press, New York,6B,1065–1073 (1987).Google Scholar
  8. 8.
    Ryan, M.J., Scott, W.R. andSottos, N.R., “Scanning Heterodyne Micro-interferometry for High Resolution Contour Mapping, Rev. of Progress in Quantitative Nondest. Eval., Plenum Press, New York (1990).Google Scholar
  9. 9.
    Carslaw, H.C. andJaeger, J.C., Conduction of Heat in Solids, Oxford Science Publications, New York (1959).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1991

Authors and Affiliations

  • N. R. Sottos
    • 1
  • W. R. Scott
    • 2
  • R. L. McCullough
    • 3
  1. 1.216 Talbot LaboratoryUniversity of IllinoisUrbana
  2. 2.Naval Air Development CenterWarminster
  3. 3.Department of Chemical EngineeringUniversity of DelawareNewark

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