Ebook: Growth Stresses and Strains in Trees
Author: Dr. Robert R. Archer (auth.)
- Tags: Agriculture, Forestry, Plant Sciences, Ecology
- Series: Springer Series in Wood Science 3
- Year: 1987
- Publisher: Springer-Verlag Berlin Heidelberg
- Edition: 1
- Language: English
- pdf
Although over 40 years have passed since Jacobs (1945) convincingly established the basic radial pattern of residual growth stress in growing trees, yet this phenomenon is still not widely appreciated in wood science and technology circles. This is in spite of the fact that the presence of these stresses of sizeable magnitudes has long been recognized as a primary cause of shakes and splits in logs as well as the warping of lumber sawn in the green condition. The presentation of the subject of growth stresses in trees presents some special problems due to the wide range of specialists who potentially might have an interest in the subject. For example, tree physiologists interested in questions such as the relation of mechanical stress to stem taper and the role of reaction wood and gravity forces in determining tree crown form encounter growth stress models. Silvi culturists interested in the relation ofthinning practices to wood quality find that wood properties are correlated with growth stress levels which are in turn significantly changed by cutting practices. Wood techno logists interested in the relation of residual growth stress gradients in green logs to the dimensional quality of sawn and seasoned lumber are forced to take a more quantitative approach to the effect of growth stresses than might have been the case in the past.
Content:
Front Matter....Pages I-X
An Introduction to Growth Stresses....Pages 1-15
On the Measurement and Interpretation of Surface Growth Strains....Pages 16-49
Mechanisms for the Generation of Surface Strains....Pages 50-65
Internal Residual Stress Patterns in Tree Stems....Pages 66-113
Experimental Verification of Internal Residual Stress Distributions....Pages 114-153
Redistribution of Growth Stress States Due to Cutting....Pages 154-204
Back Matter....Pages 205-240
Content:
Front Matter....Pages I-X
An Introduction to Growth Stresses....Pages 1-15
On the Measurement and Interpretation of Surface Growth Strains....Pages 16-49
Mechanisms for the Generation of Surface Strains....Pages 50-65
Internal Residual Stress Patterns in Tree Stems....Pages 66-113
Experimental Verification of Internal Residual Stress Distributions....Pages 114-153
Redistribution of Growth Stress States Due to Cutting....Pages 154-204
Back Matter....Pages 205-240
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