Abstract
Closed-form crack mouth opening displacement (CMOD) for a surface flaw in a plate under remote tension was obtained first, based on the analogy of the displacement around an elliptical crack in an infinite elastic solid and that of a surface crack. This closed form CMOD showed good agreement with the experiments by Torii et al. and with results by our boundary element analysis (BEA) for a wide range of flaw configuration. Next, a closed-form local stress intensity factor (SIF) was obtained primarily by assuming that this CMOD is applied to a single edge cracked strip (general compliance method) with the same crack depth, and secondarily by modifying SIF based on the near crack tip displacement by BEA results. Finally, our closed form SIF was compared with Newman-Raju's empirical solution at the deepest point for reference. Our closed form SIF is expected to give a straightforward perspective of the solution for the crack.
