An analytical method for calculating the stress intensity factor of multiple cracks at collinear holes in an infinite plate was introduced. Complex functions are used to calculate the stress functions. Approximate superposition method is applied to solve SIF problems of multi-hole plate. Numerical examples of symmetrical cracks arising from collinear holes are examined by this method. By comparing the analytical results and finite element results, it was realized that the analytical method is valid but has limitations. Use multi-stage calculation method, SIF problems on symmetrical cracks arising from collinear holes can be solved.
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