Walkden, Eve and Bloodworth, Alan G. (2017) Visualization of fresh cut timber deformation by photogrammetry. Journal of Engineering Mechanics, 143 (4). 04016123. doi:10.1061/(ASCE)EM.1943-7889.0001177 ISSN 0733-9399.

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Abstract

Understanding the mechanical behavior of fresh cut timber, in which the natural moisture content has been retained, has application in predicting the behavior of living tree elements such as branch/stem joints, potentially inspiring structural designs through biomimicry. This project develops a process of strain imaging using particle image velocimetry to analyze behavior of timber samples freshly cut from oak tree joints and tested in tension. The timber surface was not coated so the fiber response could be visualized directly. Load was applied in steps and different methods for comparing images were trialled, including a sequential method in which strain is accumulated progressively from image to image and a first-to-last comparison. Sample flexibility caused significant deformation in the camera field of view, and so the analysis methodology was modified so that each image was compared sequentially with the first with the target area in the image for strain calculation expanded as the test proceeded. This resulted in strain contour plots able to show the impending failure of the component as the tension is applied.

Item Type:	Journal Article
Subjects:	S Agriculture > SD Forestry
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Timber -- Testing, Oak, Photogrammetry, Particle image velocimetry
Journal or Publication Title:	Journal of Engineering Mechanics
Publisher:	American Society of Civil Engineers
ISSN:	0733-9399
Official Date:	April 2017
Dates:	Date Event April 2017 Published 22 November 2016 Available 9 August 2016 Accepted 26 March 2016 Submitted
Volume:	143
Number:	4
Article Number:	04016123
DOI:	10.1061/(ASCE)EM.1943-7889.0001177
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	17 January 2017
Date of first compliant Open Access:	17 January 2017
Funder:	Engineering and Physical Sciences Research Council (EPSRC), University of Southampton
Grant number:	Grant no. EP/P504740/1 (EPSRC)
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