Dynamic hardness of wood - measurements with an automated portable hardness tester

de Assis, Albert Augusto; Alexandre, Rogerio Pinto; Ballarin, Adriano Wagner

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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Dynamic hardness of wood - measurements with an automated portable hardness tester

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Author(s):	de Assis, Albert Augusto ; Alexandre, Rogerio Pinto ; Ballarin, Adriano Wagner Total Authors: 3
Document type:	Journal article
Source:	HOLZFORSCHUNG; v. 71, n. 5, p. 383-389, MAY 2017.
Web of Science Citations:	1
Abstract
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. (AU)

FAPESP's process:	08/08414-0 - Hardness tester for wood - prototype instrumentation and validation of calibration results
Grantee:	Adriano Wagner Ballarin
Support Opportunities:	Regular Research Grants

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