Center for Computing Research (CCR)

Center for Computing Research

John A. Mitchell

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

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.

  • 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)

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

2017
2016
  • Castillo, Andrew R, John A. Mitchell, Stephen D Bond, "Using and Developing Novel Data Analytics for Digitalized Microstructures ," SAND Report, November 2016.
  • Mitchell, John A., "Potts model for grain growth during welding using SPPARKS," Poster, 8th International Conference on Multiscale Materials Modeling, Dijon France, October 2016.
2015
2014
2013
2012
2011
2009
  • Mitchell, John A, Marco Alvares, Michael S Baker, Mathew A Spletzer, Danelle M Tanner, "The Sandia MEMS Passive Shock Sensor: FY09 Maturation Activities Reaching TRL 5+," SAND Report, November 2009.
2008
2007
2006
2005
2003
2002
2001