Stress analysis of a multilayered composite cylinder with defects

摘要

The stress analysis of a multilayered composite cylinder with a local delamination is considered. The cylinder comprises an internal thin walled metal cylinder wrapped in layers formed by winding a unidirectional fiber bundle round it while simultaneously adding epoxy. A realistic analytical model is proposed and a system of differential-difference equations is developed. The problem is reduced to a system of linear ordinary differential equations with constant coefficients by introducing a transformation of super-subscripts. The normal method of solving this kind of system of differential equations is then adopted. The numerical calculations were conducted for a composite cylinder with a local delamination that initiates at the front of a surface notch. The results indicate that the stress distributions are subject to disturbance due to the delamination in composite cylinder and the stress concentrations occur near the surface notch or the front of the delamination. Also, all stresses in the composite layers are lower than that in the internal metal cylinder.