Current Research Interests:
- Origins of the mechanical properties of bulk and nanoscale metals
Dislocation structure evolution (statistical physics theory), stresses in dislocation structures (X-ray microbeam experiments, theory, modeling), slip band evolution (in situ atomic force microscopy), nanoindentation multiscale modeling (finite element and classical atomistic), nanowire deformation (classical atomistic and quantum simulations).
- Synchrotron X-ray scattering and diffraction:
Ultra-small-angle X-ray scattering (USAXS) from dislocation structures (experiment and theory), co-developer of USAXS imaging which is available for general users at the Advanced Photon Source, spatially resolved stress measurements using depth resolved sub-micrometer X-ray beams
Activities Organized:
- Founded the Dislocations Conference Series (2000), permanent member of international organizing committee.
- Plasticity Conference Symposia (2003, 2005)
- MRS Symposia (2001, 2003, 2004, 2006)
- TMS Symposia (2007)
- APS Focus Sessions (1997, 1998)
- Workshops and Short Courses (2 in 1998, 2 in 2006)
Awards:
NIST Allen V. Astin Measurement Science Award (2004)
For advancements in the measurement of dynamic material properties, leading to the first ever stress-strain measurements at high strain-rate and heating-rate
NIST Outputs:
- Invited talks: 77
- Books edited: 3
- Review chapters: 2
- Road maps: 2
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Position:
Materials Research
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Employment History:
1997 – present: Staff Position, Materials Science and Engineering Laboratory, NIST
- Project Leader, Fundamentals of Deformation (1997-present)
- Program Leader, Forming of Lightweight Materials (2001 - 2007)
- Project Leader, Ballistic Performance of Frangible Bullets and Protective Gear (2004 - 2007)
1995 – 1997: Research Associate at Washington State University, working as NIST Guest Scientist
- Fundamentals of deformation
- USAXS from dislocation structures
1993 – 1995: Visiting Assistant Professor of Physics at Washington University in St. Louis
- Quasicrystals (transmission electron microscopy)
1991 – 1993: Postdoctoral Position, IBM T. J. Watson Research Center
- Developed in situ ultra-high vacuum, scanning tunneling microscopy of electromigration processes
Education:
Ph.D. Physics, Washington University, St. Louis, 1990
M.A. Physics, Washington University, St. Louis, 19887
B.S. Physics, California Institute of Technology, 1983
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