Contributions of End-Wall and Lumen Bonding to Strength to Butt Joints,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1967
- Accession Number
- AD0664557
Entities
People
- J. T. Quirk
- R. F. Blomquist
- T. T. Kozlowski
Organizations
- Forest Products Laboratory