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Publication
Effect of quality, porosity and density on the compression properties of cork
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Advisor(s)
Abstract(s)
The compression properties of cork were studied
on samples obtained from cork planks of two commercial
quality classes (good and poor quality), with densities ranging
from 0.12–0.20g cm−3 and porosities from0.5 to 22.0%.
The stress-strain curves were characterized by an elastic region
up to approximately 5% strain, followed by a large
plateau up to 60% strain caused by the progressive buckling
of cell walls, and a steep stress increase for higher strains
corresponding to cell collapse. The direction of compression
was a highly significant factor of variation, with cork
showing higher strength for the radial compression.
Density influenced compression and cork samples with
higher density showed overall larger resistance to compression
in the three directions. In the elastic region, an exponential
model of Young’s modulus in function of cork
density could be adjusted.
The effect of porosity on compression was small and the
stress-strain curves were similar regardless of the porosity
of the samples, although there was a trend toward an overall
increase of stress with porosity for higher strains. Porosity
was characterised by a high variability in the anatomical features of the lenticular filling material and the presence of
collapsed and thick walled lignified cells. The inclusion of
a porosity parameter for the modelling of the elastic modulus
did not improve the prediction obtained with densitybased
models.
There was no significant difference in the compression
properties of cork samples obtained from cork planks of
good and poor quality classes.
Description
DOI 10.1007/s00107-008-0248-2
Keywords
Cork Porosity Density
Pedagogical Context
Citation
ANJOS, O. ; PEREIRA, H. ; ROSA, M.E. (2008) - Effect of quality, porosity and density on the compression properties of cork. Holz Roh Werkst. 66. p. 295-301.