Weight functions for multiple axial cracks in a coated hollow cylinder

摘要

In this paper, the weight functions for multiple axial cracks in a coated hollow cylinder have been investigated. The stress intensity factors (SIFs) for two reference loading cases were computed via the finite element method, which was then used to derive the weight functions. Dimensional analysis was carried out to reveal the dependence of dimensionless weight function on various important quantities such as normalized crack depth, crack spacing, and material constants. The results of such parameters dependence were presented in graphical forms and were eventually expressed by an empirical formula through a decoupled fitting method. Comparison was made on the SIF determination by the derived weight function and by other methods in literature, and an excellent agreement was found. The derived weight functions are expected to facilitate SIF calculation for a coated hollow cylinder with multiple axial cracks.