NDT — An Aid to Failure Analysis

  • H. P. Hatch
Part of the Sagamore Army Materials Research Conference Proceedings book series (SAMC, volume 24)


Improved performance and reliability are dependent upon the material quality characteristics of individual components, and nondestructive testing (NDT) techniques aid in predicting premature failure by the detection of critical size defects or by the detection of material property gradients which can be equally detrimental in brittle materials. However, quantitative NDT results are dependent upon a number of variables. To illustrate the effectiveness of NDT to assist with the analysis of suspect material, results of metallurgical and NDT analyses of two transmission gears are presented. Inclusions much larger than specifications allow were detected ultrasonically and confirmed metallographically. The mechanical properties and structure of the gears seemed otherwise to be consistent with good metallurgical practice.


Failure Analysis Ultrasonic Signal Transmission Gear Bolt Hole Signal Gate 
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  1. 1.
    Hastings, C.H., “Nondestructive Tests as an Aid to Fracture Prevention Mechanics”, Journal of the Franklin Institute, Vol. 290, No. 6, December 1970, pp. 589–98.CrossRefGoogle Scholar
  2. 2.
    Fopiano, P.J., Hatch, H.P. and Brockelman, R.H., “Materials Analysis of Two Combiner Gears from a CH-47 Helicopter”, Army Materials and Mechanics Research Center, Watertown, Mass., R.port No. AMMRC TN 76–7, October 1976.Google Scholar
  3. 3.
    Nondestructive Testing Handbook, Robert C. McMaster, ed., New York: The Ronald Press Company, 1959.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • H. P. Hatch
    • 1
  1. 1.Army Materials and Mechanics Research CenterWatertownUSA

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