Stresses in dried wood. Modelling and experimental identification |
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Authors: | Stefan Jan Kowalski Anna Smoczkiewicz-Wojciechowska |
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Institution: | (1) Institute of Technology and Chemical Engineering, Poznań University of Technology, pl. Marii Skłodowskiej Curie 2, 60-965 Poznań, Poland |
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Abstract: | The paper presents a simple mathematical model of drying that permits evaluation of moisture content distribution in dried
wood during the constant and falling drying rate periods and, in particular, estimation of stresses generated from the moment
when the moisture content at the body surface reaches the fibre saturation point (FSP). The acoustic emission method (AE)
is used for monitoring the state of stress in dried wood. The numerically evaluated drying induced stresses are compared with
the number of acoustic signals and their energy monitored on line during drying tests. It can be stated that the enhanced
emission of acoustic signals occurs at those moments when the drying induced stresses approach their maximum. Both the numerical
calculus and the experimental tests were conducted on a pine-wood sample in the form of a disk. |
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Keywords: | Shrinkage Stresses Destruction Modelling Acoustic emission |
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