Abstract
This paper presents an evaluation of the Willenborg crack growth retardation model. This model utilizes an effective concept to reduce the crack tip stress intensity factor. With the exception of the constant amplitude growth rate data for a given material, the model does not rely on any empirically derived parameters. A summary of the model is presented, including the basic assumptions, the range of application, and usage limitations. Comparisons with existing experimental data for typical randomized block spectra and flight-byflight spectra show very good correlation. However, the model does not produce good results for highly ordered (low-high or high-low) spectra. Results are also presented for single and multiple overload spectra for 7075-TG and 2024-T3 aluminum alloys. The periodic overload behavior for these alloys was predicted with an accuracy that was within the typical scatter of the constant amplitude growth rate data.
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