Abstract
The 2D stress concentration factors in laminated composite plates with multiple holes and notches under unidirectional tensile stress have been studied using finite element method. The aim of author is analyze the effect of different stacking gradation and distance between the holes upon stress concentration factor. Analysis has been done for symmetric composite laminates, and the finite element formulation is carried out in the analysis section of the『ANSYS』package. The variations of stress concentration factors in regard to different stacking gradation and distance between the holes are presented in graphical form and discussed. When the holes located on X axis, the stress concentration factor will be reduced; located on Y axis, the stress concentration factor will increase.