Abstract:The second order statistics of mixed mode stress intensity factors (MSIF) of single edge V-notched angle ply laminated composite plate subjected to uniaxial tensile load with uncertinity in the system properties using displacement correlation method (DCM) is evaluated. The random system properties such as material properties, crack opening and crack length are modelled as combined uncorrelated and correlated random system variables. A C nite element method (FEM) based on higher order shear deformation plate theory (HSDT) is used for basic formulation. The Taylor series based rst order perturbation technique (FOPT), second order perturbation technique (SOPT) are used and direct Monte Carlo simulation (MCS) is performed to evaluate the statistics (mean and coe cient of variance) of the mixed mode SIFs. The present work signi es the accurate analysis of frature behaviour by in uence of di erent random variables and bre orientations on the fracture behaviour in angle ply laminates.