Method for the determination of the stresses occurring in...

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified load or strain transmission device from specimen...

Reexamination Certificate

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Reexamination Certificate

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07814799

ABSTRACT:
The present invention relates to a method for the determination of the stresses occurring in wood when drying or being dried. With the method in accordance with the invention, electrodes are used to generate an electric field in drying wood in order to measure the electric complex spectrum using the impedance spectroscopy method while at the same time employing sensors to measure acoustic emissions from drying wood and using the results for calculating the parameters required for determining the stress state existing in the wood and for monitoring and/or controlling the drying process.

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J.D. Booker et al., “Acoustic Emission Related to Strain Energy During Drying of Eucalyptus Regnans Boards”, Journal Wood Science and Technology, vol. 29, No. 2, Feb. 1995, pp. 145-156.
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R.M. Honeycutt et al., “Use of Acoustic Emissions to Control Drying Rate of Red Oak”, Forest Products Research Society 1985, vol. 35, No. 1, Jan. 1985, pp. 48-50.
D.D. Bettinger et al., “Microprocessor Based System for the Detection and Characterization of Acoustic Emissions for Materials Testing”, Industrial Electronics, Control, and Instrumentation, 1993, Proceedings of the IECON '93, International Conference on Nov. 15-19, 1993, vol. 3, pp. 2364-2367.
S.J. Kowalski et al., “The Identification of Fracture in Dried Wood Based on Theoretical Modelling and Acoustic Emission”, Wood Sciencee Technology 38 (2004) pp. 35-52, Published online Mar. 16, 2004, Springer-Verlag 2004.

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