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Abstract

This publication covers experimental investigations made at the
Division of Forest Products, Council for Scientific and Industrial
Research, Melbourne, during the period December, 1940, to January,
1946, to determine the effect of temperature on the strength of wood,
plywood and glued joints. The investigations deal with reversible
changes in_ strength, elasticity, and the like which may accompany
variations in the temperature of the material.
Results show that all properties investigated are affected by temperature
at some moisture content, in many instances to such an extent that serious
error is introduced in mechanical testing and in design where this factor
is not taken into account. Temperature coefficients may exceed one per
cent of the value at 20° C. per degree centigrade. Relations are given
from which the effect of temperature on certain properties of a species can
be estimated quantitatively with considerable confidence for a wide range
of temperatures and moisture contents.
PART I. deals with compression, bending, and toughness tests on
Sitka spruce and five Australian species at nominal moisture contents of
8, 12, and 20 per cent. in the range - 20 to + 60° C. Compression
tests on these species were extended to zero moisture content and near saturation,
in respective ranges of - 20 to + 90° C. and - 20 to + 60°
C. In addition, two low density species were included in the compression
tests. Two species were also examined in bending at zero moisture content
from - 20 to + 80° C.
PART II. covers tests made at 15 per cent. nominal moisture content
on standard size hoop pine specimens in compression and shear from zero
to 40° C. and in bending at 20 and 40° C., also on 2 in. X 3/4 in. X 3/4 in.
specimens of the same species in compression from - 20 to + 60° C.
PART III. describes tests on hoop pine plywood. At nominal
moisture contents of 8, 12, and 20 per cent., tensile and crushing strengths
were examined from - 20 to + 80° C. Investigation of crushing strength
was extended to include zero moisture content. Modulus of elasticity
was examined at all the above moisture contents, but only from - 20 to
+ 60° C.
PART IV. discusses tests on casein, pheno-formaldehyde and urea-formaldehyde
glued joints at temperatures from - 15 to + 60° C. in the range 8 to 20 per cent moisture content.
PART V. summarizes the more important features of the investigations
in general terms and gives results of independent confirmatory tests.

Item Type:	Thesis - Unspecified
Authors/Creators:	Sulzberger, PH
Keywords:	Wood, Adhesive joints, Plywood
Copyright Holders:	The Author
Copyright Information:	Copyright 1955 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Also issued as: Report / Aeronautical Research Consultative Committee, ACA-46. Thesis (M.Sc.)--University of Tasmania, 1956
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