Factors Affecting Fatigue Crack Propagation from Cold-Expanded Holes
Abstract: In life prediction of structural components containing an initial flaw it is particularly important to determine stress intensity factors (SIFs) to a high degree of accuracy. In the particular case of cracks emanating from cold worked holes a very important factor affecting the prediction of fatigue crack propagation is the aleatory variation of experimentally-derived residual stress distributions. This presentation will discuss a model of fatigue crack propagation and present results of simulations when uncertainties in the input residual stress distribution are considered. Life predictions are compared with experimental fatigue life data for aluminum alloys.
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“At DST Group, we have effectively used StressCheck® over the last 10 years to determine accurate stress intensity factors. The results have been used to improve our residual strength and structural life estimates for aircraft in service with the Royal Australian Airforce, including C-130, P-3C and F/A-18 A/B. We have found it to be extremely easy to use and a very versatile code with which to create parametric models.
We have recently used StressCheck® to obtain improved stress intensity factor solutions (Improved stress intensity factors for selected configurations in cracked plates and Improved stress intensity factors for a single corner crack at a loaded fastener hole) for five key generic configurations. These transferable parametric results have been published externally. One specific example is the non-linear contact analysis of a cracked, filled fastener hole, with both fastener and remote plate loading.”
Dr. Manfred Heller, HeadStructural & Damage Mechanics, DST Group