EARLY DETECTION OF FATIGUE DAMAGE IN ALUMINUM ALLOYS BY ULTRASONICS

摘要

The literature concerning ultrasonic wave propagation and fatigue-induced damage in aluminum has been surveyed to determine the possible interactions. The causes of wave attenuation have been compared with the fatigue effects in metals predicted by various theories to determine the experimental conditions that would maximize the measurements of those effects. Particular attention is paid to the dislocations present in metals because they form and move throughout the fatigue life of a sample. The problem at hand is the detection of incipient fatigue which implies early detection and measurement.