Weight functions and stress intensity factors for the single crack round-ended straight lug

Abstract

Investigations were performed for the round-ended straight attachment lug with a single crack emanating from the hole with the weight function method. The weight functions, covering the geometries from W/D = 1.5 to W/D = 4.0, were generated from the results obtained with a boundary element method using the approximate weight function technique. The results have been given both in the form of analytical weight functions and tabulated dimensionless stress intensity factors for simple normalized powers of the crack line loading. This is a simple straight forward procedure to calculate stress intensity factors once the crack line loading is approximated by a polynomial. The present method is also valid for deriving stress intensity factors and weight functions for general crack configurations.

2D weight function for quarter‐elliptical cracks in lug attachments

“…Zhao et al 13,14 used 1D weight function method for surface cracks around a hole in a finite thickness plate. Wang 15 extracted a 1D weight function for a lug which contains a through crack. Obtained weight function was based on 2D BEM.…”

Novel weight functions and stress intensity factors for quarterelliptical cracks in lug attachments

“…Rigby and Aliabadi [12] used the boundary element method and the J-integral to obtain SIFs in a single quarter elliptical and symmetrical quarter elliptical cracks in a lug. Wang [13] extracted a weight function (WF) for a wide range of through cracks in a lug based on the boundary element method. Mikheevskiy et al [14] employed the WF technique for fatigue crack growth analysis of a cracked lug using the load-shedding effect.…”