Roszyk , Puszy ń ski : Variation in Mechanical Properties within Individual

This paper shows results of specifi c modulus of elasticity and specifi c tensile strength in the resonance spruce wood [Picea abies (L.) Karst.] in relation to its heterogeneity within individual annual rings. It also presents changes in the average values of microfi bril angle in S2 layer measured in tangential walls of tracheids (MFA) within individual annual rings. On the grounds of the results, it can be concluded that specifi c modulus of elasticity and specifi c tensile strength of wood are strongly infl uenced by the position of the sample in annual rings. Generally, the values of these parameters increase along the width of annual rings. It is also noted that the specifi c modulus of elasticity and specifi c tensile strength depend on MFA. As MFA decreases, the values of these parameters increase.

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  2014

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