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• W2185954844 abstract "Wood anatomical characteristics of ten commercial timbers of Nigeria: Ceiba pentandra; Diospyros mespiliformis; Afzelia africana; Brachystegia nigerica; Gossweilerodendron balsamiferum; Periscopsis elata; Khaya ivorensis; Milicia excelsa; Mansonia altissima and Gmelina arborea were determined and their potentials in the prediction of five strength parameters: compression; cleavage; shear; indentation and tensile were assessed. The anatomical characteristics showed variations in fibre length; fibre diameter; fibre lumen diameter; fibre cell wall thickness; number of fibres per field of view; number of vessels per field of view; vessel diameter in the tangential direction and in the derived values: Runkel ratio; slenderness ratio and coefficient of flexibility. Variations occurred also among the species in all the strength parameters assessed, which include compression; tension; indentation; cleavage and shear. The statistical analysis showed significant differences among the means tested for in the ten timber species (P= 0.05). Anatomical parameters with highly significant correlations - positive or negative were of good strength predictive potentials. The strength prediction equation (Ŷ= bx + a) was derived for each of the strength parameters assessed and the validity of these equations determined. When the mean of any of the anatomical parameters (x) is substituted in the equation, the corresponding strength could be worked out. Species with longer fibres offered less resistance to compression, indentation and tensile forces. Fibre diameter showed no significant correlations with any of the strength parameters and therefore was not of any predictive value. Species with narrower fibre lumina offered more resistance to compression, cleavage and tensile forces. Timber species with thicker fibre walls were more resistant to compression and tensile forces, but less resistant to indentation force. Species with more fibres per field of view were more resistant to compression and cleavage forces. Timber species with many vessels per field of view offered more resistance to compression, indentation and tensile forces, but low resistance to cleavage force. Timbers whose vessel diameters are wider in the tangential directions offered lower resistance to compression, cleavage and tensile forces. Among the three derived fibre values assessed, slenderness ratio had no strength predictive potential. The other two, coefficient of flexibility and Runkel ratio had good strength predictive potentials which seemed antagonistic in nature. While species with high coefficient of flexibility offered low resistance to compression, cleavage and tensile forces but high resistance to indentation force. Species with high Runkel ratio gave high resistance to compression, cleavage and tensile forces" @default.
• W2185954844 created "2016-06-24" @default.
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• W2185954844 date "2014-01-01" @default.
• W2185954844 modified "2023-09-27" @default.
• W2185954844 title "Biomechanics, an aspect of the relationships between Wood Anatomical Parameters and Mechanical Strength in Ten Nigerian Timber species" @default.
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