Computation of SIFs for Cracks in Cold-Worked Holes
Abstract: Reliable prediction of crack growth and residual strength in metallic structures require accurate computation of SIFs. Since analytical solutions for complex configurations are not available, estimates of SIFs have to be obtained by numerical methods such as the FEM. The particular case of cracks emanating from cold worked holes is of practical importance. To account for residual stresses in the computation of SIFs, two approaches were investigated:
- modified J-integral with the J → K conversion
- contour integral method for loaded cracks (CIM-LC)
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“Accurate and reliable stresses and Stress Intensity Factors are required for determination of static and residual strength and for crack growth analyses in analysis tools such as AFGROW. For some geometries, industry solutions are either insufficient or nonexistent. The geometry, applied forces, and crack shapes and dimensions must be modeled reasonably well to obtain useful engineering data. The p-version finite element software StressCheck® (ESRD, Inc., St. Louis, Missouri, USA) is used to demonstrate how accurate finite element solutions can lead to good quality engineering analysis.”