A Comparison of Two Non-Destructive Techniques for Determining the Modulus of Elasticity of Small-Diameter Roundwood
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:
- Format:
- application/pdf
- 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/