Center for Computing Research (CCR)
Center for Computing Research
John A. Mitchell
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John A. Mitchell Computational Multiscale Email: jamitch@sandia.gov Phone: 505/844-3435 Fax: 505/845-7442 Mailing address: Sandia National Laboratories P.O. Box 5800, MS 1322 Albuquerque, NM 87185-1320 |
Brief Research and Project History
- Nonlinear solver algorithms and implementations for solid mechanics
- Engineering project management
- Technology maturation and assessment
- Constitutive model development (particularly Peridynamics)
- GPU programming
- Inverse problems
- Models for grain growth in metals using Kinetic Monte Carlo (KMC)
- Data analytics applied to metal material microstructures, insitu pyrometry data
- Grain morphology effects on dynamic response of additively manufactured metals
Current Activities
My work is at the confluence of engineering mechanics (especially continuum mechanics), materials and data science, mathematics, algorithms development, and software implementations. I am especially interested in bridging the gap between engineering and applied mathematics, and demonstrating and/or developing novel solutions and implementations for emerging problems.
- Microstructure effects on dynamic response of materials
- Grain growth modeling of welding and additive manufacturing processes using KMC (see SPPARKS)
- Data analytics & machine learning applied to material microstructures
- Peridynamics constitutive model development towards multiscale analysis and upscaling
- Processing and analysis of measured additive manufacturing pyrometer data
Recent Project Work and Activities (See reports/presentations below)
- SPPARKS tutorial
- Micromechanics calculations using Eshelby approach
- Nonlinear kinematics for dielectrics (especially piezoelectric materials)
- Mean curl discretization for 2D nonlinear magnetic diffussion equations
- Vectorization of uniform gradient hexahedron for solid mechanics calculations on a GPU
- Kinetic Monte Carlo modeling of grain growth associated with weld process for metals
Other Activities and Interests
I'm from Homer Alaska and I like to visit there during the summer for camping/hiking/fishing and visiting with friends. I also like to exercise and at one time was very active in training for triathlons -- now I just try to move a bit every day.
Education/Background
- B.S. Ocean Engineering Texas A&M University (1987)
- M.S. Engineering Mechanics Virginia Tech (Advisor: J.N. Reddy, Thesis topic: Finite element formulation and implementation for piezoelectricity) (1992)
- Ph.D. Mechanical Engineering Texas A&M University (Advisor: J.N. Reddy, Thesis topic: Multilevel/hierarchical preconditioning for p-finite elements) (1997)
Selected Publications & Presentations
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