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The Impact of Moisture Content on the Accuracy of Wood Properties Evaluation by Drilling Resistance Measurement Method

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E.S. Sharapov, V.Yu. Chernov, A.S. Toropov, E.V. Smirnova

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The method of diagnostics and control of wood on the basis of drilling resistance measuring
is one of the rapidly developing areas in the field of wood science and examination of wooden building constructions. The method of wood properties evaluation by drilling is based on the cutting process. Thus wood moisture content has a significant impact both on
the cutting process and density determination. The available results of the studies of the influence of moisture content on wood drilling resistance using boring drill bits do not allow to describe the true nature of the interaction of these variables with sufficient accuracy. The
investigations were carried out by a mobile device for wood and wood materials properties evaluation by drilling "ResistYX" (New Forest Technology LLC, Yoshkar-Ola), equipped with the standard drill bits. The significant impact of wood moisture content on wood drilling power, the process of wood chip formation and the accuracy of wood properties evaluation was established experimentally. It is related to changes in the mechanical properties of wood, and with an elastic recovery of cutting surface. The increasing of wood moisture content from absolutely dry condition to a normalized moisture level (10...12 %) is characterized by the decreased drilling power in average of 21 % for birch (B?tula P?ndula) and 15
% for the samples of pine (P?nus sylv?stris) and oak (Qu?rcus R?bur). A further increase of moisture content of wood samples up to 90...150 % is accompanied by the increasing of drilling power in average up to 50 % for birch and 25 % for pine and oak. The approximation of experimental data was carried out by using continuous piecewise smooth function on the intervals of direct and inverse relationship of drilling power with wood moisture content (coefficient of determination for pine – 0.69, for birch – 0.85, for oak – 0.71).


E.S. Sharapov, Candidate of Engineering Sciences, Associate Professor V.Yu. Chernov, Candidate of Engineering Sciences, Associate Professor A.S. Toropov, Doctor of Engineerig Sciences, Professor E.V. Smirnova, Postgraduate Student


Volga State University of Technology, Lenin sq., 3, Yoshkar-Ola, Mari El Republic,
424000, Russian Federation; е-mail:


wood density, wood moisture content, non-destructive wood properties control, drilling resistance measurement, resistograph, ResistYX.


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Received on November 30, 2015

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