Predicting static bending modules of elasticity of Tropical African hardwoods from density using a model based on longitudinal vibration
1999
Ayarkwa, J. | Hirashima, Y. | Sasaki, Y.
The longitudinal vibration technique was examined as a means of predicting static bending modulus of elasticity (MOA) from wood density of tropical African hardwoods. Dynamic MOAs measured using the longitudinal vibration test of large specimens of Obeche (Triplochiton scleroxylon), Makore (Tieghemella heckellii) and Moabi (Baillonella toxisperma) were 19.6 and 12% respectively higher than static bending MOEs reported in the literature. Dynamic MOE was strongly correlated to wood density (r=0.97), and a linear regression model developed could predictstatic bending MOE from wood density when tested on some 42 commercial and secondary tropical African hardwoods, with percentage errors ranging up to 17%. In view of the lack of proper laboratary wood testing machines in tropical developing African countries, the model is recommended as a usefulk and fast tool for predicting static modulus of elasticity of tropical timbers, especially the secondary species, from their wood densities. It may also be applicable in the finger-jointing industry for sorting and matching random short lengths of timber for jointing together. If properly applied, the model is expected to lend support to sustainable tropical forest management and the efficient utilization of tropical timber resources.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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تم تزويد هذا السجل من قبل Forestry Research Institute of Ghana