Modelling longitudinal elastic an shrinkage properties of wood |
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Authors: | S Koponen T Toratti P Kanerva |
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Institution: | (1) Laboratory of Structural Engineering and Building Physics Faculty of Surveying and Civil Engineering, Helsinki University of Technology, Espoo, Finland |
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Abstract: | Summary A model was developed for estimating elastic and shrinkage properties of a softwood cell wall from the properties of its polymeric
constituents: cellulose, hemicellulose and lignin. The theory of composite materials was used. Based on a literature survey,
models of latewood, earlywood and compressionwood of a softwood cell wall structure were made. The model takes into account
the helical winding of the microfibrils in the cell wall and it estimates the behaviour of a balanced laminated double-cell
wall in which rotation is restrained by adjacent cells. The calculated elastic and shrinkage properties were compared with
earlier test results and good agreement was found. |
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Keywords: | |
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