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|Title: ||Influence of finger-joint geometry and end pressure on tensile properties of three finger-jointed Tropical African Hardwoods|
|Authors: ||Ayarkwa, J.|
|Issue Date: ||Jul-2000|
|Publisher: ||Southern African Forestry Journal|
|Citation: ||Southern African Forestry Journal, No. 188|
|Abstract: ||Three tropical African hardwoods, Obeche (Triplochiton scleroxylon), Makore (Tieghemella heckelii) and Moabi (Baillonella toxisperma), were finger jointed using three different finger profile geometries, three different end pressures, and resorcinol formaldehyde adhesive, with a view to assessing the effect of these factors on the tensile properties of the. joint.
Finger profile geometry was found to significantly affect ultimate tensile strength, but not tension modulus of elasticity (MOE) of finger joints from the three species. The,finger profile geometry having 18 mm finger length exhibited significantly the strongest and the most efficient finger joint compared with finger profile geometry Moving 10 inm and 20 mm ringer lengths. End-pressure significantly increased ultimate tensile strength of finger joints only when it seemed to have resulted in an increase in the tightness of the fit of the fingers in the joint.
Finger joints of high strength and efficiency were produced when the profile having 18mm finger length was combined with the end pressure of 12 MPa for Makore and Moabi, and end pressure of 8 MPa for Obeche. Among the three species, finger joints from the low density Obeche exhibited the highest joint efficiency with a high percentage wood failure, followed by the medium density Makore and the high density Moabi.
Tropical African hardwoods oflow- to medium-densities are recommended for the production of fingerjoints of high ,joint efficiency and high wood failure, using resorcinol formaldehyde glue.|
|Description: ||This article was published by Southern African Forestry Journal in 2000|
|Appears in Collections:||College of Architecture and Planning|
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