La tipografía como signo de identidad visual corporative: Codificación y decodificación visual del sistema de identidad
Raposo, D.
2008
Relation between mechanical properties of cork from Quercus suber
Type
conferenceObject
Creator
Identifier
ANJOS, O. ; Pereira, H. ; ROSA, M.E. (2008) - Relation between mechanical properties of cork from Quercus suber. In Latin American IUFRO Congress, 2, La Serena, 23-27 Outubre. 12 p.
Title
Relation between mechanical properties of cork from Quercus suber
Subject
Cork
Mechanical properties
Young modulus
Quality
Lenticular channels
Density
Porosity
Mechanical properties
Young modulus
Quality
Lenticular channels
Density
Porosity
Date
2014-03-07T15:10:04Z
2014-03-07T15:10:04Z
2008
2014-03-07T15:10:04Z
2008
Description
Cork is known as the material used for the production of wine stoppers. The specific properties of
cork, e.g. low density, very low permeability to water, elastic properties and inertness have made it the
best sealant for quality wine. Here we studied the relation between compression, tensile and bending
stress in cork and the influence of structural characteristics of cork on its mechanical behaviour. The
material was sampled from raw cork planks of good quality (class 1) and poor quality (class 4) collected at
one industrial mill after post-harvest six-month air stabilization, water boiling and air drying as usually
applied in cork industrial processing. The samples had densities ranging 0.123 - 0.203 g.cm-3 and
porosities between 0.5 and 22.0%.
There are differences between the type of stress and the corresponding direction of stress. For
the same direction of stress, the Young modulus in tension is higher then in bending and it is lowest in
compression. The bending Young modulii were well correlated with the tensile Young modulii, because
while in bending the sample is submitted to both tensile and compression stresses, the fracture occurs in
the tensile zone. There were no significant differences in the mechanical properties of cork samples
obtained from cork planks of different quality classes but the density is an important factor and samples
with higher density showed overall larger resistance. Mechanical properties were influenced by the
structural features related to the lenticular channels, namely the presence of thick walled and lignified cells
that may border the lenticular channels.
Access restrictions
openAccess
Language
eng
Comments
