Relationships Between Transverse Free Vibration E and Other Properties, as Affected By Knots

Dynamic E was measured in two different modes, flat-wise (EDF) and edgewise (EDE), in transverse free vibration by the Irvington E-computer. Static E’s were measured and compared to dynamic E’s. Neasurements were made on pieces with only a single knot in the center of the length. Long-span static bending E’s, both flatwise and edgewise, are slightly lower than the corresponding dynamic E’s. The long-span static tension E is approximately equal to EDE. EDE is lower than EDF for pieces with an edge knot, but not for pieces with a centerline knot. EDE and EDF are capable of predicting tensile strength approximately with the same precision as the corresponding long span static E’s.

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