The phenomenon of failure in objects is one of the major issues that human beings have been facing for a long time, and because of advances in technology in the present age, this issue is more important than in the past.All engineering materials, on the other hand, have tiny cracks from which failure begins.Therefore, estimating the residual life of thin plates made from these materials and used in space and offshore structures requires knowledge of the stress distribution due to cracking in these components. Because of the singularity of the crack tip due to large stresses, the presence of a relatively small crack can lead to a hazardous situation. Therefore, this area should be given more attention.In this research, using the Inglis formula and considering the correction coefficient of the compensatory free surface, the value of the stress coefficient for edge crack is obtained. Then, by replacing the new stress coefficient in Westergaard formula, we calculate the stress field of Mode I (Opening mode) and Mode II (sliding mode) in the perforated plane containing the edge crack. Finally, we examine the effects of various parameters such as loading angle, crack length and hole radius on the values obtained for stress in both modes by plotting. تفاصيل المقالة