Nondestructive testing technique to quantify deterioration from marine borer attack in Sitka spruce and Western hemlock logs [electronic resource] : observations from a pilot test / Robert J. Ross [and three others].
Publication Info.
Madison, WI : United States Department of Agriculture, Forest Service, Forest Products Laboratory, 2014.
Stress-wave nondestructive evaluation (NDE) techniques are used widely in the forest products industry--from the grading of wood veneer to inspection of timber structures. Inspection professionals frequently use stress-wave NDE techniques to locate internal voids and decayed or deteriorated areas in large timbers. Although these techniques have proven useful, little information exists concerning the relationship between stress-wave parameters and deterioration observed as a consequence of marine borer attack. In this pilot test, we examined the relationship between stress-wave transmission time and the quality of wood in Sitka spruce and western hemlock logs that had varying degrees of deterioration as a consequence of attack from marine borers. Stress-wave transmission time, perpendicular to grain, was measured at several locations on each log. The logs were then sawn into lumber, which was then visually evaluated. A relationship was observed between stress-wave transmission time and deterioration of the logs and the yield of lumber from the logs.
Funding
Funded by the Federal Financial Assistance Grand PNW 03-DG-11261975-137
