Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Daniewicz, Steve
Committee Member
Newman Jr, Jim
Committee Member
Myers, Oliver
Committee Member
Luck, Rogelio
Date of Degree
12-10-2010
Document Type
Dissertation - Open Access
Major
Mechanical Engineering
Degree Name
Doctor of Philosophy (Ph.D)
College
James Worth Bagley College of Engineering
Department
Department of Mechanical Engineering
Abstract
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.
URI
https://hdl.handle.net/11668/17018
Recommended Citation
Crapps, Justin Mandel, "Development Of A Macrostructural Model For Studying The Combined Effects Of Plasticity And Roughness Induced Crack Closure" (2010). Theses and Dissertations. 1415.
https://scholarsjunction.msstate.edu/td/1415
