Engineering Transactions, 41, 3-4, pp. 329-336, 1993

Second-Order Strains of Lignostone Under Creep and Constitutive Equations

M. Czech
Białystok University of Technology, Białystok
Poland

Specimens of the beech wood lignostone are tested for creep under simple tension along the grain and torsion, respectively. The second-order strains (interrelated strains) 2l12 and l11 generated in result of pure tension and torsion are found to be nonlinear. To describe that nonlinear behaviour, the nonlinear theory of visco-elasticity has been employed and the similarity of the creep curves is used. Correct description of the considered phenomena is obtained as a result.

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References

A.L.RABINOVIČ, On calculation of the orthotropic layered panels under tension, bending and shearing [in Russian], Works of MAP, no. 675, Oborongiz 1948.

S.G.LEKHNICKIJ, Theory of elasticity of the anisotropic body [in Russian], GITI, 1950.

A.N.MITINSKIJ, Elastic characteristic of wood considered as orthotropic material [in Russian], Works of LTA, 63, 1948.




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