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The Effect of Knots on the Fracture Strength of Wood - I. A Review of Methods of Assessment

Part I of this paper reviews various approaches, other than conventional visual and mechanical stress grading procedures, that have been used to non-destmctively assess the Strength of knotted timber. In each case the approach employed is quantitative, relying on a dimensional measurement of the knot. In addition to the method based on the use of fracture mechanics (utilising the concept of equivalent crack length), the work describes the use of the knot ratio, which depends on both the size and position of the knot, and the use of orthotropic stress concentration factors.