Contributions of end-wall and lumen bonding to strength of butt joints
U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1968 - House & Home - 12 pages
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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adhesive age class adhesive mix adhesive penetration average lumen perimeter boundary layer butt joints cell wall area cell wall thickness cross-sectional cell wall cut cell walls depth of adhesive differences in strength ductile adhesive earlywood and latewood earlywood joints effect of adhesive effective cell wall effective end wall elastomer end wall area end-wall and lumen end-wall bonding fabricated from untreated Forest Products Laboratory found between joint inner lumen walls joints bonded joints fabricated joints of earlywood latewood joints lumen bonding microtome millimeter of specimen number of cells perimeter effect perimeter ratios perimeters per unit Pinus elliottii radial and tangential slash pine specific gravity strength of joints strength values structural features surfaces of earlywood tensile strength tensile stress thickness and lumen three adhesive age tracheid U.S. Forest Service unit of specimen untreated surfaces vaseline treatment vaseline-treated surfaces viscosity wood structure wood surface wood type zinc stearate treatment zinc stearate-treated surfaces