Contributions of end-wall and lumen bonding to strength of butt joints

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U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1968 - House & Home - 12 pages
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Strength of normal butt joints of slash pine (Pinus elliottii Engelm.) varied by wood type (earlywood or latewood) and as a result of aging of the ductile epoxy-resin adhesive before it was used. Magnitude of the difference in tensile strength between earlywood joints and latewood joints was directly associated with the capacity of the adhesive-end wall and adhesive-lumen perimeter bonds to distribute stress. Thin-walled earlywood cells were more conductive to stress distribution than were thick-walled latewood cells. The capacity of the end-wall bond to transmit stress was virtually independent of adhesive viscosity, as controlled by age of the adhesive used in fabricating a joint. Moreover, it appeared that for joints fabricated from untreated surfaces, the effect of adhesive age on joint strength was directly associated with bonding to the inner lumen walls. (Author).

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