Predicting By Sonic Measurements the Strength of Logs and Poles Having Internal Decay

The travel time of a sonic wave in the diametral direction through a log is greater if internal decay is present. An empirical formula was derived relating this increase in travel time to the diameter of the decay pocket, and from this formula predictions of log crushing strength were made. To simulate core boring, the extent of soft decay was determined by direct measurement, which in turn was also used to predict crushing strength. Both methods of prediction were found to be equivalent when compared with actual crushing strength. Novel probes were developed for sonic testing of power poles below ground level.

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