Influence of moisture content on physical and mechanical properties of <i>Calophyllum</i> sp wood
DOI:
https://doi.org/10.5902/1980509870446Schlagworte:
Catanudo, Moisture content, Linear modelAbstract
Due to its excellent resistance to traction and compression, wood is regularly used in furniture, window frames and in structures and sealing of homes and buildings. Due to the anisotropy and complexity of the material, its properties vary depending on its intrinsic anatomical characteristics and external factors, such as species, moisture content, acting requests, among others. The Brazilian standard provides linear models for estimating and correcting all strength and stiffness properties as a function of the moisture content of the wood. However, due to its characteristics, there may not be a linear variation of the physical and mechanical properties in relation to the moisture content. Thus, this research aims to evaluate and analyze the influence of moisture content on 15 properties of Calophyllum sp. The reliability of the Brazilian standard equation for correcting strength and stiffness values as a function of humidity (U% to 12%) was evaluated, in addition to analyzing, through ANOVA, whether there is a change in the properties when they are at the saturation point of the fiber and 12% moisture. Of the 15 properties analyzed, 4 did not change, contrary to the linear models set out in the Brazilian standard. In addition, it was possible to note that the Brazilian standard can estimate with an error of up to 76% when correcting the humidity to 12%.
Downloads
Literaturhinweise
ALMEIDA, T. H.; SOUZA, A. M.; MARTINS, A. S. M.; CHRISTOFORO, A. L.; ALMEIDA, D. H.; LAHR, F. A. R. Effect of service temperature on shear strength of Pinus wood for roof structures. Acta Scientiarum. Technology, v. 40, n. 6, 2018. DOI: https://doi.org/10.4025/actascitechnol.v40i1.30913
ALMEIDA, T. H.; ALMEIDA, D. H.; ARROYO, F. N.; ARAÚJO, V. A.; CHAHUD, E.; BRANCO, L. A. M. N.; PINHEIRO, R. V.; CHRISTOFORO, A. L.; LAHR, F. A. R. Time of exposure at 60°C service temperature: influence on strength and modulus of elasticity in compression parallel to the grain of hardwood species. BioResources, v. 14, n. 1, p. 207-219, 2019. DOI: https://doi.org/10.15376/biores.14.1.207-219
AQUINO, V. B. M.; FREITAS, M. V. P.; VASCONCELOS, C. Q.; ALMEIDA, J. P. B.; ARROYO, F. N.; RODRIGUES, E. F. C.; CHRISTOFORO, A. L.; ALMEIDA, D. H.; SILVA, S. A. M.; SILVA, D. A. L.; PINHEIRO, R. V.; LAHR, F. A. R. Physical and mechanical characterization of Planchonella Pachycarpa wood species for use in structural purpose. Wood Research, v. 66, n. 2, p. 267-276, 2021. DOI: https://doi.org/10.37763/wr.1336-4561/66.2.267276
BRAZILIAN ASSOCIATION OF TECHNICAL STANDARDS. NBR 7190: Design of wooden structures. Rio de Janeiro, p. 107. 1997. (in Portuguese)
BRAZILIAN ASSOCIATION OF TECHNICAL STANDARDS. NBR 7190: Design of wooden structures. Rio de Janeiro, p. 107. 2022. (in Portuguese)
CHRISTOFORO, A. L.; ARROYO, F. N.; SILVA, D. A. L.; PANZERA, T. H.; LAHR, F. A. R. Full characterization of Calycophyllum multiflorum wood specie. Engenharia Agrícola, v. 37, n. 4, 2017. DOI: https://doi.org/10.1590/1809-4430-Eng.Agric.v37n4p637-643/2017
COUTO, N. G.; ALMEIDA, J. P. B.; GOVONE, J. S.; CHRISTOFORO, A. L.; LAHR, F. A. R. Relationship between shear strength and compressive strength parallel to grains of hardwoods. Ambiente Construído. v. 20, n. 4, p. 319-327, 2020. DOI: https://doi.org/10.1590/s1678-86212020000400475 (in Portuguese)
DIAS, F. M.; ALMEIDA, T. H.; ARAÚJO, V. A.; PANZERA, T. H.; CHRISTOFORO, A. L.; LAHR, F. A. R. Influence of the apparent density on the shrinkage of 43 tropical wood species. Acta Scientiarum. Technology, v. 41, n. 7, 2016. DOI: https://doi.org/10.4025/actascitechnol.v41i2.30947
FRAGIACOMO, M.; MENIS, A.; MOSS, P. J.; CLEMENTE, I.; BUCHANAN, A. H. Numerical and experimental thermal-structural behavior of laminated veneer lumber (LVL) exposed to fire. Proceedings […], WCTE 2010, v. 4, n. 3, p. 3047-3056, 2010. ISSN 9781622761753. DOI: https://doi.org/10.1260/2040-2317.1.3.145
IBA. Brazilian Tree Industry: Annual Report IBA 2020. 2020. Available at: https://iba.org/datafiles/publicacoes/relatorios/relatorio-iba-2020.pdf. Accessed on: July 20, 2021. (in Portuguese)
LAHR, F. A. R.; CHRISTOFORO, A. L.; VARANDA, L. D.; CHAHUD, E.; ARAÚJO, V. A.; BRANCO, L. A. M. N. Shear and longitudinal modulus of elasticity in wood: relations based on static bending tests. Acta Scientiarum, v. 39, n. 4, p. 433-437, 2017. DOI: https://doi.org/10.4025/actascitechnol.v39i4.30512
LAHR, F. A. R.; ARROYO, F. N.; RODRIGUES, E. F. C.; ALMEIDA, J. P. B.; AQUINO, V. B. M.; WOLENSKI, A. R. V.; SANTOS, H. F.; FERRAZ, A. L. N.; CHAHUD, E.; MOLINA, J. C.; PINHEIRO, R. V.; CHRISTOFORO, A. L. Models to estimate longitudinal compressive strength of Brazilian hardwood based on apparent density. BioResources, v. 16, n. 1, p. 1373-1381, 2021. DOI: https://doi.org/10.15376/biores.16.1.1373-1381
Downloads
Veröffentlicht
Zitationsvorschlag
Ausgabe
Rubrik
Lizenz
Copyright (c) 2023 Ciência Florestal
Dieses Werk steht unter der Lizenz Creative Commons Namensnennung - Nicht-kommerziell 4.0 International.
A CIÊNCIA FLORESTAL se reserva o direito de efetuar, nos originais, alterações de ordem normativa, ortográfica e gramatical, com vistas a manter o padrão culto da lingua, respeitando, porém, o estilo dos autores.
As provas finais poderão ou não ser enviadas ao autor.
Os trabalhos publicados passam a ser propriedade da revista CIÊNCIA FLORESTAL, sendo permitida a reprodução parcial ou total dos trabalhos, desde que a fonte seja citada. Os originais não serão devolvidos aos autores.
As opiniões emitidas pelos autores dos trabalhos são de sua exclusiva responsabilidade.
