Issue 51

S. Merdaci et alii, Frattura ed Integrità Strutturale, 51 (2020) 199-214; DOI: 10.3221/IGF-ESIS.51.16 214 f(z) : Warping function (transverse shear function)  : The upper surface. f ’(z) : The first derivative of the warp function with respect to z Q ij : The stiffness coefficients x  , y  , z  : Normal stresses i, j : Natural numbers. xy  , yz  , yx  : Shear stress [K] : Symmetrical matrix x  , y  : Deformation in the x, y and z direction    : Vector of generalized displacements xy  , yz  , yx  : Distortion deformation {F} : Vector of generalized efforts u  , v  , b w  , s w  : Virtual field of displacement w : Non-dimensional central deflection w b : Flexural components x  , y  , xy  , xz  , yz  : Non-dimensional stresses w s : Shear components z : Coordinate Thickness m, n : Mode numbers.