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Parametric Studies of Thermographic Detection of Disbonds in Laminated Structures Using Computational Simulations

  • P. A. Howell
  • William P. Winfree
  • B. Scott Crews
  • Elliott Cramer
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

A quantitative assessment of a structure’s material characteristics contributes to the safety, reliability, and useful lifetime of a structure. Thermographic nondestructive evaluation has advantages over other methods in that it is a noncontacting, quantitative measurement of the material integrity which can inspect large areas in a short period of time. A disbond between layers of a laminated structure will prevent heat from penetrating from the surface layer to the subsurface layers and will result in an increase in temperature over the disbond. The limits of this technique for detection of disbonds in solid rocket motors was investigated by computational simulation of the thermographic technique. This has an advantage over an experimental investigation, since many sample configurations and flaw sizes can be investigated at a fraction of the cost and time required for sample fabrication, data acquisition and analysis. This paper presents a series of simulations varying parameters that affect the thermal contrast such as heating time, disbond size, and thickness of the surface layer. Experimental results are presented for comparison.

Keywords

Heat Transfer Coefficient Contact Resistance Heating Time Computational Simulation Laminate Structure 
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.
    A. Shapiro, “TOPAZ2D - A Two-Dimensional Finite Element Code for Heat Transfer Analysis, Electrostatics, and Magnetostatics Problems,” UCID-20824. Lawrence Livermore National Laboratory, Livermore, California 94550, July, 1986.Google Scholar
  2. 2.
    P. H. James, C. S. Welch, and W. P. Winfree, in Review of Progress in Quantitative NDE, edited by D. O. Thompson and D. E. Chimenti ( Plenum Press, New York, 1989 ), Vol. 8A, pp. 801–809.Google Scholar
  3. 3.
    W. P. Winfree, and P. H. James, from ISA Proceedings, 35th International Instrumentation Symposium, “Thermographic Detection of Disbonds,” 1989.Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • P. A. Howell
    • 1
  • William P. Winfree
    • 2
  • B. Scott Crews
    • 1
  • Elliott Cramer
    • 2
  1. 1.Analytical Services & Materials, Inc.USA
  2. 2.Langley Research CenterMS 231 NASAHamptonUSA

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