Abstract
It has been shown previously [1] that there is a sound theoretical basis for believing that stress in metals can be detected and quantified by observing its effects on ultrasonic velocity when time-varying thermal gradients are made to occur within the same region as the stress. Experiments have verified the existence of the effect but as yet, deficiencies in instrumentation have precluded close quantitative comparison between theory and experiment. Modifications to correct these deficiencies are in progress and indicate that the improvements required are well within reach.
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