ABSTRACT
The dimensions of test specimens employed in wood characterization are always established searching situations where friction interference is annulled in deformation measurements. NBR 7190 norm (ABNT, 1997Associação Brasileira de Normas Técnicas - ABNT. NBR 7190: Projetos de Estruturas de Madeira. Rio de Janeiro: ABNT. 1997.) - Annex B adopts specimens to compression parallel to grain tests with 1:3 ratio between the side (50 mm) of cross section and length, while COPANT 464 (COPANT, 1972Comisión Panamericana de Normas Técnicas - COPANT. COPANT 464: Método de determinación del la compresión axil o paralelo al grano. Buenos Aires: COPANT; 1972.) and ASTM D 143 (ASTM, 1982American Society for Testing and Materials - ASTM. ASTM D143: Standard methods of testing small clear specimens of timber. Philadelphia: ASTM; 1982.) establish 1:4 ratio. The purpose of this research was to determine whether 1:3, 1:4 and 1:5 ratios in the specimens, referring respectively to 150, 200 and 250 mm lengths could influence the Ec0 obtained in compression parallel to grain test. Analyses were performed in ‘Canelao’ (Nectandra membranacea), Corymbia citriodora and ‘Angelim’ (Vatairea sp.) species. E c0 values for the mentioned species were statistically equivalent at 5% significance level, demonstrating that length variation did not affect the property values analyzed.
Keywords:
wood; compression parallel to the grain; modulus of elasticity; length of specimens.
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