The report describes the investigation of several thermographic (infrared) techniques and their applicability to the detection of unbonded areas in babbitted bearings. Standard defect samples were prepared with films of oil and grease between layers of babbitt and steel. These samples were systematically investigated by techniques designed to (1) detect a 'thermal shadow' in an arrangement providing an equilibrium heat flux through the sample, or (2) detect differences in the time required for different areas of the sample to dissipate an impulse of heat. The results indicate that several techniques are capable of detecting unbonded areas and that a technique of measuring the return of the sample surface to equilibrium temperature following a thermal impulse was most sensitive to the sample defects. A design was developed to improve the technique. Some ultrasonic test results and some time-average interference holograms are also presented.

  • Corporate Authors:

    Naval Ship Research and Development Center

    Washington, DC  United States 
  • Authors:
    • Dickey, J
    • Brescia Jr, N
  • Publication Date: 1972-7

Media Info

  • Pagination: 39 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00040908
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NSRDC-28-124 R&D Rpt
  • Files: TRIS
  • Created Date: Feb 14 1973 12:00AM