Dynamic Photoelasticity as an Aid to Sizing Surface Cracks by Frequency Analysis

  • A. Singh
  • C. P. Burger
  • L. W. Schmerr
  • L. W. Zachary


This paper describes a method for sizing surface cracks that have been modeled as machined slots.1 Several techniques have been used in the past to size surface cracks. Most use compressional (P) and shear (S) waves. Less attention has been given to using Rayleigh (R) waves or surface waves for sizing cracks. Since the energy of Rayleigh waves is confined to a layer of material near the surface, these waves have à great potential for sizing surface cracks. These are exactly the cracks that are hardest to characterize with traditional ultrasonic techniques because they lie in the “near-field” region of the transducers.


Shear Wave Rayleigh Wave Nondestructive Test Acoustic Surface Wave Transmitted Wave 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • A. Singh
    • 1
  • C. P. Burger
    • 1
  • L. W. Schmerr
    • 1
  • L. W. Zachary
    • 1
  1. 1.Ames Laboratory, USDOE, Engineering Research Institute and Department of Engineering Science and MechanicsIowa State UniversityAmesUSA

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