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New Growth Increments Sustain Stem Strength

Reference Type
University Outreach Publication

<br /><br /> The strength of tree stems is dependent upon stem thickness, stiffness, and ability to react to changes in aspects toward gravity and wind events. Materials added farther from the stem center (neutral axis) has a much greater impact on strength (per unit weight), than closer to the center materials.&nbsp; This positioning effect is the mechanic strength advantage seen when comparing hollow tubes and solid rods of equal weight, made of the same material -- the tube can resist force more effectively than the rod without deformation. The geometry of where materials are deposited change the strength for resisting bending and twist (torsion).<br /><br /> This publication will examine, in a theoretical context, the strength of a solid stem and the structural effectiveness of adding increments around the circumference. This publication has been prepared to help tree specialists appreciate tree biomechanics. Dynamic forces and loads, and various tree-specific, climate specific, and associated environmental attributes create a complex set of problems not discussed here. Figure 1 provides a definition of estimating static strength of additional increments.<br /><br /> Tree Biomechanics Series<br /><br /> FOR00-015<br /><br />

Authors
Dr. Kim D. Coder
Date Published
2005
Publisher
Warnell School of Forestry and Natural Resources, University of Georgia
Publisher Location
Athens, GA
Pages
4
Publication Number
FOR00-015
Sub-Topics
Biology (tree), Disaster, Evaluation/Assessment, Mechanics (tree), Plant Health Care, Risk Assessment and Hazard, Safety Issues, Storms, Structure (tree)
State(s)/Region(s)
National, Southeast, International
Keywords
mechanics, Leaf characteristics, biomechanics, statics, risk assessment
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