Wood Fracture Pattern during the Water Adsorption Process
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W. Liyu
Summary
A research program was conducted to investigate the effect of water transition on wood fracture properties, focusing on fracture behavior and patterns with different crack orientations of Betula platyphylla Suk. and Pinus bungeana in three different moisture adsorption processes. At a constant temperature of 20°C, three levels of relative humidity were considered: 66%, 82% and 100%. The results indicated that moisture content did not influence the crack propagation path, while specimen crack orientation did. With longer moisture adsorption times, the time needed to reach the maximum load from the critical load also grew; this is because below the fiber saturation point, from excessive dryness to a certain moisture content, the cell wall becomes less brittle and the toughness is enhanced. At 20°C constant temperature, the fracture toughness gradually increased from oven-dry state adsorbing moisture to 82% relative humidity, but decreased from 82% to 100% relative humidity. Within a tree species, fracture toughness depended on specimen type. The fracture toughness of LT specimens was by far higher than that of TL and TR specimens. The LT specimen fracture toughness of Betula platyphylla Suk. was comparable to that of Pinus bungeana.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Contents
- Subject Index
- Species Index
- Author Index
- Diurnal Differences in the Innermost Surface of the S2 Layer in Differentiating Tracheids of Cryptomeria japonica Corresponding to a Light-Dark Cycle
- The Isolation of Specific Bio-Control Agents for the Dry Rot Fungus Serpula Lacrymans
- TEM Examination of Surface Characteristics of Rubberwood (Hevea brasiliensis) HTMP Fibers
- Termiticidal Performance of Wood-Based Composites Treated with Silafluofen Using Supercritical Carbon Dioxide
- Use of Animal Proteins to Limit Leaching of Active Copper Ions Preservatives from Treated Wood
- Speciation of Cr and As Leachates from CCA Treated Wood by Differential Pulse Polarography
- Delignification Mechanism during High-Boiling Solvent Pulping Part 3. Structural Changes in Lignin Analyzed by 13C-NMR Spectroscopy
- Topochemical Investigations on Delignification of Picea abies [L.] Karst. during Alkaline Sulfite (ASA) and Bisulfite Pulping by Scanning UV Microspectrophotometry
- Delignification of Bamboo (Bambusa procera acher) Part 2. Characterisation of Kraft Black Liquors from Different Cooking Conditions
- The Effect of Magnesium Ions and Chelants on Peroxide Bleaching
- Moisture Content of Green Wood in High Temperature Water Vapor
- Wood Fracture Pattern during the Water Adsorption Process
- Use of the Partial Least Squares Method with Acoustic Vibration Spectra as a New Grading Technique for Structural Timber
- Mode I Fracture Behaviour on the Growth Ring Scale and Cellular Level of Spruce (Picea abies [L.] Karst.) and Beech (Fagus sylvatica L.) Loaded in the TR Crack Propagation System
- Microtensile Testing of Wood Fibers Combined with Video Extensometry for Efficient Strain Detection
- Mapping Radial,Tangential and Longitudinal Shrinkages and Relation to Tension Wood in Discs of the Tropical Tree Symphonia globulifera
- Assessment of Wood-Cement Compatibility: A New Approach
Articles in the same Issue
- Contents
- Subject Index
- Species Index
- Author Index
- Diurnal Differences in the Innermost Surface of the S2 Layer in Differentiating Tracheids of Cryptomeria japonica Corresponding to a Light-Dark Cycle
- The Isolation of Specific Bio-Control Agents for the Dry Rot Fungus Serpula Lacrymans
- TEM Examination of Surface Characteristics of Rubberwood (Hevea brasiliensis) HTMP Fibers
- Termiticidal Performance of Wood-Based Composites Treated with Silafluofen Using Supercritical Carbon Dioxide
- Use of Animal Proteins to Limit Leaching of Active Copper Ions Preservatives from Treated Wood
- Speciation of Cr and As Leachates from CCA Treated Wood by Differential Pulse Polarography
- Delignification Mechanism during High-Boiling Solvent Pulping Part 3. Structural Changes in Lignin Analyzed by 13C-NMR Spectroscopy
- Topochemical Investigations on Delignification of Picea abies [L.] Karst. during Alkaline Sulfite (ASA) and Bisulfite Pulping by Scanning UV Microspectrophotometry
- Delignification of Bamboo (Bambusa procera acher) Part 2. Characterisation of Kraft Black Liquors from Different Cooking Conditions
- The Effect of Magnesium Ions and Chelants on Peroxide Bleaching
- Moisture Content of Green Wood in High Temperature Water Vapor
- Wood Fracture Pattern during the Water Adsorption Process
- Use of the Partial Least Squares Method with Acoustic Vibration Spectra as a New Grading Technique for Structural Timber
- Mode I Fracture Behaviour on the Growth Ring Scale and Cellular Level of Spruce (Picea abies [L.] Karst.) and Beech (Fagus sylvatica L.) Loaded in the TR Crack Propagation System
- Microtensile Testing of Wood Fibers Combined with Video Extensometry for Efficient Strain Detection
- Mapping Radial,Tangential and Longitudinal Shrinkages and Relation to Tension Wood in Discs of the Tropical Tree Symphonia globulifera
- Assessment of Wood-Cement Compatibility: A New Approach
