Resumen

SOTOMAYOR-CASTELLANOS., Javier R.. Dynamic modulus of rigidity of seven types of Mexican wood determined by torsional vibration. Rev. Chapingo ser. cienc. for. ambient [online]. 2016, vol.22, n.2, pp.125-134. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2015.03.008.

The modulus of rigidity of wood is useful for the structural calculus and manufacture of wood products. The objective of this research was to determine the modulus of rigidity (GLT) of seven species of Mexican woods (Enterolobium cyclocarpum, Tabebuia donnell-smithii, T. rosea, Swietenia humilis, Lysiloma acapulcensis, Cordia elaeagnoides y T. chrysantha), performing torsional vibration tests. The density, moisture content and natural frequency of smaller specimens were also determined. The GLT values of the seven species are similar to those proposed by the revised authors for woods with comparable density and moisture content. The moduli of rigidity varied between 695 MPa and 2,807 MPa 695 MPa (E. cyclocarpum) y 2,807 MPa (T. chrysantha). The values for each species oscillate around the linear prediction proposed by the elastic model of the wood. The wood density and the natural frequency of vibrations in torsion are predictors of the dynamic modulus of rigidity with coefficients of determination of 0.98 and 0.81 respectively.

Palabras llave : Density; humidity content; torsional natural frequency; mechanical characterization.

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