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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: HOLZFORSCHUNG; v. 71, n. 5, p. 383-389, MAY 2017.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 08/08414-0 - Durômetro portátil para madeiras - instrumentação do protótipo e validação dos resultados de calibração
• Beneficiário: Adriano Wagner Ballarin
• Modalidade de apoio: Auxílio à Pesquisa - Regular