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THEORETICAL APPROACH 2 5
EXPERIMENTAL APPROACH 7 3
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adjacent elements analysis of wood anisotropic Appendix assumed assumption behavior of wood bending brittle CM CM coefficients coordinate system crack deformation determined displacement functions elastic constants elastic limits elasto-plastic elemental stress components equations experimental F-ratio finite element analysis finite element method fracture G xy growth rings Hooke's law idealized inelastic isotropic isotropic material lignin linear linear-stress midspan deflection midspan nodal vertical Modulus moisture content nodal displacements nodal vertical displacements nodes obtained orthotropic material orthotropic properties parallel to grain parameters perpendicular to grain plane plastic plastic analysis Poisson's ratio quadrilateral rectangular element network relationship result rings per inch shown in Figure specific gravity stiffness matrix stiffness properties strength of wood strength theory stress analysis stress distribution stress matrix stress-strain curves stress-strain data tensile stress testing machine ultimate load values viscoelastic wood beam Wood Handbook wood specimens xy xy xy xy yx yield