Skip to Main Content
Modeling strength loss in wood by chemical composition. Part I, An individual component model for southern pineAuthor(s): J. E. Winandy; P. K. Lebow
Source: Wood and fiber science. Vol. 33, no. 2 (Apr. 2001).:p. 239-254.
Publication Series: Miscellaneous Publication
PDF: Download Publication (241 KB)
DescriptionIn this study, we develop models for predicting loss in bending strength of clear, straight-grained pine from changes in chemical composition. Although significant work needs to be done before truly universal predictive models are developed, a quantitative fundamental relationship between changes in chemical composition and strength loss for pine was demonstrated. In particular, this study explored a linear independent-component modeling approach. The models were evaluated across a range of environmental exposure conditions known to cause strength loss and with several chemical treatments capable of causing hydrolytic chemical degradation in wood. Simple linear models developed reasonably accurate predictions of strength loss of clear, straight-grained southern pine wood based on changes in its chemical composition. Side-chain sugars of hemicellulose were the most susceptible to acid hydrolysis. The extent of their degradation was a sensitive predictor of early strength loss. Those sugars associated with the hemicellulose backbone were the next most susceptible, but they were strongly correlated between themselves. This is known as collinearity and, as such, data from either mannose or xylose, or from Klason lignin or glucose, often precluded the need for the other in the models. A linear three-parameter model using changes in a side-chain hemicellulose (arabinose), a main-chain hemicellulose (mannose), and glucose as an indicator of the extent of cellulose degradation reasonably predicted bending strength loss. We believe that with further work, residual strength or serviceability models based on a linear accumulation of the changes in chemical composition of wood during microbiological attack, thermochemical treatments, or severe environmental exposures can be developed to provide sensitive predictors of post-treatment or in-service strength loss.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationWinandy, J. E.; Lebow, P. K. 2001. Modeling strength loss in wood by chemical composition. Part I, An individual component model for southern pine. Wood and fiber science. Vol. 33, no. 2 (Apr. 2001).:p. 239-254.
KeywordsPinus, Wood chemistry, Chemical composition, Bending strength, Linear models, Sugars, Glucose
- Comparison of the effects of gamma irradiation and steam sterilization on Southern pine sapwood
- An experimental method to simulate incipient decay of wood basidiomycete fungi
- Correlations between grain angle meter readings and bending properties of mill-run southern pine lumber
XML: View XML