Journal
INTERNATIONAL JOURNAL OF FRACTURE
Volume 198, Issue 1-2, Pages 179-195Publisher
SPRINGER
DOI: 10.1007/s10704-016-0090-1
Keywords
Titanium alloys; Ti-6Al-4V; Fracture; Failure; Localization; Anisotropy; Viscoplasticity; Void evolution; Thermomechanical; Regularization; Nonlocality; Surface elements
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Funding
- Joint DoD/DOE Munitions Technology Development Program (JMP)
- JMP
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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The second Sandia Fracture Challenge illustrates that predicting the ductile fracture of Ti-6Al-4V subjected to moderate and elevated rates of loading requires thermomechanical coupling, elasto-thermo-poro-viscoplastic constitutive models with the physics of anisotropy and regularized numerical methods for crack initiation and propagation. We detail our initial approach with an emphasis on iterative calibration and systematically increasing complexity to accommodate anisotropy in the context of an isotropic material model. Blind predictions illustrate strengths and weaknesses of our initial approach. We then revisit our findings to illustrate the importance of including anisotropy in the failure process. Mesh-independent solutions of continuum damage models having both isotropic and anisotropic yields surfaces are obtained through nonlocality and localization elements.
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