Abstract
In this paper, the defect with noncircular shape in a two-dimensional structural component is identified by using the complex method incorporated into the two-dimensional elastic boundary element method. The method for searching for the defect is that the norm of boundary displacement, defined as the sum of the square of the difference between experimental values and numerical solutions, becomes minimum when the assumed defect coincides with the real one. The complex method is used to find the defect shape and position with minimal norm by iteratingly modifying the fictitious defect boundary within some constraint conditions without calculating derivatives. The procedure of defect identification is discussed under several numerical examples, and it is shown that the present method is efficient and accurate in searching for the real defect.
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