Abstract
Combined roughness- and plasticity-induced crack closure for long cracks is studied using a Design and Analysis of Computer Experiments approach. A newly developed modified strip-yield model which has been adapted to incorporate the mode I effects of roughness induced crack closure is used for the study. The effects of maximum stress, load ratio, roughness asperity angle, and roughness periodicity are quantified. In addition, conditions affecting the benefit of roughness-induced crack closure are investigated.
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