This paper presents an evolutionary structural optimization method based on the displacement of the control points along the boundary of components. Since in high stress working conditions the failure of structures usually occurs in structural boundaries, minimizing the local peak stress can increase the fatigue life of structures. Also the uniform distribution of stresses in critical areas of structure will delay the crack initiation. Therefore, it is of great importance to investigate the state of stress around the holes for safety and proper performance of components. The purpose of this work is to use the Evolutionary Structural Optimization (ESO) method to attain the optimal shape of the component so that it possesses a lower stress concentration factor. Von Mises stress and Tresca Stress are employed as the design objectives. Several instances dealing with ESO and Additive Evolutionary Structural Optimization (AESO) are compared with the results obtained from other optimization methods. It is shown that the proposed methods will result in optimum shapes with a high accuracy.

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