ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 7

Monitoring to Determine the Dynamics of Fatigue Testing

Collacott, RA
Senior lecturer and Director, U. K. Mechanical Health Monitoring Group, Leicester Polytechnic, Leicester,

Abstract

These investigations were begun to monitor the sonic response during the fatigue life testing of cantilever specimens; they led to the discovery that the power spectral density from the second overtone (3 × fundamental) changed with time, originally exceeding that from the fundamental. Overtones may have a pronounced influence on fatigue testing, and the experimental results should lead to consideration of the possible dynamic effects introduced by such overtones. Tests show that changes can be detected as a consequence of work hardening and crack growth. Possibly this method may be developed as a nondestructive testing technique.

Keywords:
fatigue tests, sonic tests, power spectra

Paper ID: JTE10199J
DOI: 10.1520/JTE10199J
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