Accession Number : AD0664557

Title :   Contributions of End-Wall and Lumen Bonding to Strength to Butt Joints,

Descriptive Note : Forest Service research note,

Corporate Author : FOREST PRODUCTS LAB MADISON WIS

Personal Author(s) : Quirk,J. T. ; Kozlowski,T. T. ; Blomquist,R. F.

Report Date : 1967

Pagination or Media Count : 15

Abstract : 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)

Descriptors :   (*WOOD, BONDED JOINTS), (*BONDED JOINTS, MECHANICAL PROPERTIES), ADHESIVES, EPOXY RESINS, AGING(MATERIALS), TENSILE PROPERTIES, STRESSES, CELLS(BIOLOGY)

Subject Categories : Adhesives, Seals and Binders
      Wood, Paper and Related Forestry Products

Distribution Statement : APPROVED FOR PUBLIC RELEASE