Publicação: Dynamic hardness of wood - measurements with an automated portable hardness tester
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2017-05-01
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Walter De Gruyter Gmbh
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A research group on forest products from School of Agriculture - Sao Paulo State University. Brazil developed a portable hardness tester for wood, which is based on a displacement transducer and an embedded electronic processor for dynamic evaluation of hardness. This paper presents the results of calibration tests of the equipment, carried out on seven species of Eucalyptus. A new methodology for dynamic hardness calculation has been introduced, which relays on the reaction force of the indentation, while the measurements of indentation depth are performed under load. A moderate to strong linear correlation to Janka hardness and its variations were found. This new approach avoids the classical problems of Brinell hardness test in terms of sinking- in (causing diffuse edges) and elastic recovery of the indentation.
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Holzforschung. Berlin: Walter De Gruyter Gmbh, v. 71, n. 5, p. 383-389, 2017.
