SYMPOSIA PAPER Published: 01 January 1984
STP34451S

Application of Ultrasonic Fatigue Testing Techniques to the Evaluation of the Corrosion-Fatigue Strength of Materials

Source

A corrosion fatigue testing system has been developed for examining the corrosion-fatigue strength of engineering materials in the very high cycle regime (109 to 1010 cycles) typical of many design lifetimes. Central to this resonant fatigue testing system is a high efficiency, large displacement, piezoelectric transducer which operates at a frequency of 20 kHz, thus enabling the accumulation of large numbers of cycles in a reasonable amount of time. A description of apparatus, environmental controls, and testing method is presented. Experimental 20 kHz and low frequency corrosion fatigue results for a number of engineering materials, including a 12% chromium stainless steel, show similar reductions in fatigue limit at a specified number of cycles, despite the difference in frequency. This result holds for a variety of aqueous environments with and without electrochemical controls imposed during testing. The data illustrate the capabilities of the ultrasonic corrosion-fatigue technique and are analyzed to assess its advantages and limitations.

Author Information

Roth, LD
Materials Engineering Department, Westinghouse R&D Center, Pittsburgh, Pa.
Willertz, LE
Pennsylvania Power and Light Company, Allentown, Pa.
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Details
Developed by Committee: G01
Pages: 497–512
DOI: 10.1520/STP34451S
ISBN-EB: 978-0-8031-4894-9
ISBN-13: 978-0-8031-0264-4