ETD PDF

A Comparison of Two Non-Destructive Techniques for Determining the Modulus of Elasticity of Small-Diameter Roundwood

Citation

Anderson, Alexander D.. (2017). A Comparison of Two Non-Destructive Techniques for Determining the Modulus of Elasticity of Small-Diameter Roundwood. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/anderson_idaho_0089n_11096.html

Title:
A Comparison of Two Non-Destructive Techniques for Determining the Modulus of Elasticity of Small-Diameter Roundwood
Author:
Anderson, Alexander D.
Date:
2017
Keywords:
Mid-point MOE Non-destructive evaluation Stiffness Stress-wave velocity Third-point
Program:
Natural Resources
Subject Category:
Wood sciences
Abstract:

Because small-diameter trees are more important commercially than ever before, deriving the greatest value possible from those logs is necessary. In an effort to promote a simple, low-cost method for determining stiffness in small-diameter roundwood, we tested 50 logs (both 4-inch and 6-inch) of varying ages and species using two non-destructive evaluation techniques for grading logs—stress-wave velocity (in conjunction with density) to determine dynamic modulus of elasticity (MOE) and mid-point loading to measure static MOE. We also looked at a sample set of 90 lodgepole pine logs from a previous study to explore whether or not the MOE values taken at 45° increments fit a sine wave. Both SWV and mid-point loading gave us MOE results that correlated well with MOE values derived from third-point bending. The analysis of the 90-log data set showed more than half of the logs fitting a sine wave at a 95% confidence level.

Description:
masters, M.S., Natural Resources -- University of Idaho - College of Graduate Studies, 2017
Major Professor:
Gorman, Thomas
Committee:
McDonald, Armando; Nelson, Andrew
Defense Date:
2017
Identifier:
Anderson_idaho_0089N_11096
Type:
Text
Format Original:
PDF
Format:
application/pdf

Contact us about this record

Rights
Rights:
In Copyright - Educational Use Permitted. For more information, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
Standardized Rights:
http://rightsstatements.org/vocab/InC-EDU/1.0/