Effect of Tolerance on Selection Efficiency of Nondestructive Strength Test of Wood

For some uses of wood, the consequences of a failure may be very serious, because human hazard may be involved. Under these circumstances an infallible test with no tolerance is essential. For other uses of wood, a minimum strength is desirable but not absolutely essential because in some cases the odd low-strength piece can share its load with others, and where failure is not considered too serious, the risk involved in a small percentage of the material being below the acceptable level can be tolerated. It is shown, for example, that in cross arms it would be more economical to replace an occasional failure than to reject numerous pieces through an infallible test with no tolerance allowance.

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