Second-Order Strains of Lignostone Under Creep and Constitutive Equations
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.
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.