Moisture Stresses in a Long Hollow Wood Pole of Constant Outer and Inner Radius in a State of Plane Strain

1969 ◽  
Vol 36 (3) ◽  
pp. 641-644
Author(s):  
Basudev Ghosh
Keyword(s):  
Circular Cylinder ◽  
Moisture Content ◽  
Plane Strain ◽  
Trigonometric Series ◽  
Digital Computer ◽  
Content Distribution ◽  
Series Form ◽  
Moisture Content Distribution ◽  
Inner Radius ◽  
Infinite Sums

Moisture stresses in a long hollow hygroscopic cylindrically aeolotropic circular cylinder in a state of plane strain are determined mathematically in infinite trigonometric series form. The analysis is then applied to find similar stresses in a long hollow wood pole made up of species walnut for a physically important moisture-content distribution. It is observed that the infinite sums representing the stresses converge and the stresses can be evaluated with the help of a digital computer up to any desired accuracy.

scholarly journals Effect of Supercritical CO2 Drying on Moisture Transfer and Wood Property of Eucalyptus urophydis

Forests ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1115
Author(s):  
Lin Yang ◽  
Honghai Liu
Keyword(s):  
Moisture Content ◽  
Supercritical Co2 ◽  
Moisture Transfer ◽  
Content Distribution ◽  
Wood Property ◽  
Drying Rate ◽  
Extractive Content ◽  
Moisture Content Distribution ◽  
Bordered Pits ◽  
Supercritical Co2 Drying

Wood dried using supercritical CO2 has unique properties because water is removed directly from the cell lumens through the cycling between supercritical and gas phases. Eucalyptus urophydis green wood was dried by supercritical CO2 at 50 °C and pressure of 10, 20, and 30 MPa; the effect of supercritical CO2 drying on moisture content distribution and transfer, as well as the permeability and extractive content of the wood, was investigated. The results showed that the supercritical CO2 drying rate was high, showing the highest drying rate at 20 MPa and the lowest at 10 MPa. Drying rate increased with pressure below 20 MPa in this study; drying rate represented no positive relation to pressure over 20 Mpa. Moisture content distribution was more uneven in the low-pressure drying conditions and in the middle transverse section of the specimens. The moisture content gradient in tangential was greater than that in longitudinal, especially for the drying of 10 MPa, indicating that water was removed mainly in the former direction of wood. More extractives were removed from wood at higher pressure during supercritical CO2 drying. Bordered pits were broken up more at higher pressure conditions. The decreased extract yields and increased amount of opened bordered pits increased the permeability of the wood after supercritical CO2 drying.

Stresses in a Linear Incompressible Viscoelastic Cylinder With Moving Inner Boundary

1963 ◽  
Vol 30 (3) ◽  
pp. 335-341 ◽  
Author(s):  
M. Shinozuka
Keyword(s):  
Internal Pressure ◽  
Numerical Computation ◽  
Plane Strain ◽  
Hollow Cylinder ◽  
Digital Computer ◽  
Elastic Shell ◽  
Viscoelastic Cylinder ◽  
Stress Strain ◽  
Rate Of Increase ◽  
Inner Radius

A method is developed to find the stresses and strains in an incompressible viscoelastic hollow cylinder with moving inner radius contained by an elastic case and subject to internal pressure under the assumption of a state of plane strain. Stresses and strains are computed for a material with deviatoric stress-strain relations characteristic of a standard solid. The numerical computation is carried out with the aid of an IBM digital computer 1620 and is intended to illustrate the effects of the thickness of the cylinder, of the rate of increase of the internal pressure, and of the strength of the reinforcement provided by the elastic shell.

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