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Development of a macrostructural model for studying the combined effects of plasticity and roughness induced crack closure

Posted on:2011-12-20Degree:Ph.DType:Dissertation
University:Mississippi State UniversityCandidate:Crapps, Justin MandelFull Text:PDF
GTID:1440390002457037Subject:Engineering
Abstract/Summary:
A weight function based modified strip-yield model is adapted to include the mode I effects of roughness induced crack closure. The weight function methodology is verified for arbitrary mixed mode loading conditions under load levels experienced in fatigue crack growth. A rough crack geometry is simulated as a sine wave fitted to a sawtooth defined by an asperity angle and period. Additional mode I crack closure due to mode II sliding of crack faces is calculated and incorporated into the strip-yield model by lengthening and shortening the crack face elements. Simulations of fatigue crack growth using the newly developed model are examined via a design and analysis of computer experiments. The effects of model parameters are identified. Combined roughness and plasticity induced crack closure for long cracks is studied.
Keywords/Search Tags:Induced crack, Effects, Weight function, Strip-yield model, Fatigue crack growth
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