A homogenized microstructural approach to creep fracture |
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| Institution: | 1. Department of Applied Physics, Zernike Institute for Advanced Materials, University of Groningen, Groningen 9747 AG, The Netherlands;2. Advanced Production Engineering, Engineering and Technology Institute Groningen, University of Groningen, Groningen 9747 AG, The Netherlands;3. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China;1. Department of Mechanical Engineering, The Johns Hopkins University, 3400 N Charles St, Baltimore, Maryland 21218, United States;2. Zernike Institute for Advanced Materials, University of Groningen, Groningen 9747 AG, The Netherlands;1. Department of Mechanical Engineering, Covenant University, P.M.B 1023, Ota, Ogun State, Nigeria;2. Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, P.M.B. X680, Pretoria, South Africa;3. Department of Mechanical Engineering, University of Ibadan, Ibadan, Oyo state, Nigeria;4. Department of Mechanical and Biomedical Engineering, Bells University of Technology, Ota, Ogun State, Nigeria |
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| Abstract: | A two-dimensional nonlocal continuum model is proposed in this paper for creep damage in polycrystalline materials. Starting from previous micromechanical modeling, a heuristic homogenization approach is adopted to derive a theory for the macroscopic response. The model accounts for the main damage mechanisms (grain boundary sliding, nucleation, growth and coalescence of cavities along the grain boundaries) responsible for the creep fracture process. The resulting constitutive law takes into account the nonlocalities expressed through the gradients of the stresses and the damage variables. |
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