Strip yield crack analysis for multiple site damage in infinite and finite panels – A weight function approach

An analytical approach to the Dugdale strip yield model for multiple site damage is presented by using the weight function method. Two example problems, an array of periodic collinear cracks in an infinite sheet and a coalesced center crack in a finite width panel, are analyzed by the closed-form weigh function; the effect of finite boundary is considered. Results are extensively verified against available analytical and numerical solutions. The capability of the closed-form weight function for the strip yield model analysis of multiple site damage is demonstrated.

► The strip yield model for multiple site collinear cracks is analyzed by the using the weight function method. ► A series of exact, closed-form or high accurate plastic zone results are presented. ► The present method is effective and accurate to solve the plastic zone link up strength for flat panels with a lead and several small collinear cracks.