X-Ray Diffraction and Finite Element Study of Residual Stress Effects on FatigueCrack Growth

摘要

The combined techniques of microbeam x-ray diffraction and Finite Element (FE)analysis have been used to analyze the residual stresses resulting from an interference operation in 1080 steel. Both techniques showed the resulting stresses to be tensile, and accelerated growth rates were observed in fatigue cracks subsequently grown into this residual stress field. The growth rates also showed a clear sensitivity to applied stress intensity level. Through-thickness residual stress variations as predicted by FE analysis help explain observed crack front shapes.