Statistics > Applications
[Submitted on 10 Jan 2022 (v1), last revised 14 Feb 2023 (this version, v4)]
Title:Knots and their effect on the tensile strength of lumber: a case study
View PDFAbstract:When assessing the strength of sawn lumber for use in engineering applications, the sizes and locations of knots are an important consideration. Knots are the most common visual characteristics of lumber, that result from the growth of tree branches. Large individual knots, as well as clusters of distinct knots, are known to have strength-reducing effects. However, industry grading rules that govern knots are informed by subjective judgment to some extent, particularly the spatial interaction of knots and their relationship with lumber strength. This case study reports the results of an experiment that investigated and modelled the strength-reducing effects of knots on a sample of Douglas Fir lumber. Experimental data were obtained by taking scans of lumber surfaces and applying tensile strength testing. The modelling approach presented incorporates all relevant knot information in a Bayesian framework, thereby contributing a more refined way of managing the quality of manufactured lumber.
Submission history
From: Samuel W.K. Wong [view email][v1] Mon, 10 Jan 2022 17:10:11 UTC (10,765 KB)
[v2] Tue, 15 Mar 2022 00:41:28 UTC (340 KB)
[v3] Mon, 13 Feb 2023 14:06:34 UTC (5,737 KB)
[v4] Tue, 14 Feb 2023 21:46:31 UTC (348 KB)
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