NDT — An Aid to Failure Analysis
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.
KeywordsFailure Analysis Ultrasonic Signal Transmission Gear Bolt Hole Signal Gate
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