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When assessing the strength of sawn lumber for use in engineeringapplications, the sizes and locations of knots are an important consideration.Knots are the most common visual characteristics of lumber, that result fromthe growth of tree branches. Large individual knots, as well as clusters ofdistinct knots, are known to have strength-reducing effects. However, industrygrading rules that govern knots are informed by subjective judgment to someextent, particularly the spatial interaction of knots and their relationshipwith lumber strength. This case study reports the results of an experiment thatinvestigated and modelled the strength-reducing effects of knots on a sample ofDouglas Fir lumber. Experimental data were obtained by taking scans of lumbersurfaces and applying tensile strength testing. The modelling approachpresented incorporates all relevant knot information in a Bayesian framework,thereby contributing a more refined way of managing the quality of manufacturedlumber.

Knots and their effect on the tensile strength of lumber: a case study