Some Recent Progress on Phase-field Modeling: Fatigue and Large Structures
Wednesday, February 10, 2021
Aerospace Engineering and Engineering Mechanics
University of Texas at Austin
Over the last few decades, the phase-field approach to fracture has been shown to be a useful tool for modeling complex crack path evolution. Features including the nucleation, turning, branching, and merging of cracks as a result of quasi-static mechanical and dynamic loadings are captured without the need for extra constitutive rules for these phenomena. This presentation will touch on our recent work on the phase-field modeling approach for fatigue crack growth and modifications for large-scale structures will be discussed. For fatigue, a modified J-integral will be developed to demonstrate how the phase-field approach can be used to generate Paris-Law type crack growth rates. A steady-state finite element method is then applied to generate fits of the phase-field theory to measured crack growth rate data. Full transient simulations are performed and compared to experimental measurements on samples where crack turning is induced by the presence of a hole in the vicinity of the crack. Additionally, modifications to the damage functions are introduced to allow for the analysis of large-scale structures and the issues that arise with this modification are identified and discussed.
Chad Landis received his bachelor’s degrees in mechanical engineering and business from the University of Pennsylvania in 1994. He then went on to earn his MS (1997) and PhD (1999) degrees in mechanical engineering from the University of California at Santa Barbara. After spending a little over a year at Harvard University as a post-doc, Dr. Landis then went to Rice University where he was a member of the Mechanical Engineering and Materials Science faculty from 2000-2006. He now resides in Austin, Texas as a professor in Aerospace Engineering and Engineering Mechanics at University of Texas at Austin. Chad Landis’ research focuses on continuum modeling and numerical simulation of the mechanical, electrical, magnetic and thermal behavior of materials. His specific interests are on active/smart materials such as ferroelectrics and ferromagnetic shape memory alloys. He also has a broad range of interests in the mechanics of materials, including fracture mechanics, plasticity, micromechanics, composites, and finite element methods.