Department of Materials Science and Engineering

Richard LeSar

• B.S. in Chemistry, University of Michigan, 1975.
• A.M., Physics, Harvard University, 1977.
• Ph.D., Chemical Physics, Harvard University, 1981.

• Professor and Chair, Department of Materials Science and Engineering, Iowa State University, AMes, Iowa, 2006-present.
• Adjunct Professor, Department of Materials, University of California, Santa Barbara, California, 1993-2006.
• Technical Staff Member, Los Alamos National Laboratory, Los Alamos, New Mexico, 1983-2006.
• Postdoctoral Fellow, Los Alamos National Laboratory, Los Alamos, New Mexico, 1981-1983.

• Materials theory, modeling, and simulation.
• Dislocation-based plasticity.
• Biomolecular structure and dynamics.
• Microstructural evolution.

Richard LeSar's work focuses on the development and application of theory, modeling, and simulation of materials structures and properties. He has interest in modeling at many scales, with recent applications of electronic structure calculations (perovskites), atomistic simulations (molecular and metallic systems) and mesoscale simulations (dislocation dynamics). His work is currently focused in two areas: (1) employing dislocation simulations to guide the development of new theories of plasticity and (2) development of coarse-grained descriptions of biomolecules for simulating large-scale molecular processes.

• ME/Mat E 389x (Summer 2008) - Applied Methods in Sustainable Engineering and International Development
• MSE 530 (Spring 2008) - Solid State Science
• MSE 590 RL (Spring 2007) - Computational Modeling of Materials
• Mat 228 (UC Santa Barbara, Spring 1996, 1999, 2001, 2003) - Computational Modeling of Materials
• Chem 672 (University of Michigan, Fall 1988) - Statistical Mechanics

• "Importance of cross slip in high rate deformation,'' Z. Q. Wang, I. J. Beyerlein, and R. LeSar, Modelling and Simulation of Materials Science and Engineering 15, 675-690 (2007).
• "Dislocation motion in high-strain-rate deformation.'' Z. Q. Wang, I. J. Beyerlein, and R. LeSar, Philosophical Magazine 87, 2263-2279 (2007).
• "A parallel algorithm for 3D dislocation dynamics," Z. Wang, N. Ghoniem, S. Swaminarayan, and R. LeSar, Journal of Computational Physics 219. 608-621 (2006).
• "Direct measurements of scale-free intermittent flow in crystal plasticity," D. M. Dimiduk, C. Woodward, R. LeSar, and M. D. Uchic, Science 312, 1188-1190 (2006).
• "Energetics and noise in dislocation patterning," Robb Thomson, M. Koslowski, and R. LeSar, Physical Review B 73, 024104 (2006).
• "Preface to the viewpoint set on: Statistical Mechanics and Coarse Graining of Dislocation Behavior for Continuum Plasticity," D. M. Dimiduk, M. Koslowski, and R. LeSar, Scripta Materialia 54, 701-704 (2006).
• "Issues in the coarse graining of dislocation energetics and dynamics," J. M. Rickman and R. LeSar, Scripta Materialia 54, 735-739 (2006)
• "Theoretical predictions of new high-performance lead-free ferroelectrics," P. Baettig, C. Schelle, R. LeSar, U. Waghmare and N. Spaldin, Chemistry of Materials 17, 1376-1380 (2005).
• "Unified framework for dislocation-based defect energetics," J. M. Rickman, Jorge Vinals, and R. LeSar, Philosophical Magazine 9, 917-929 (2005).
• "Coarse-graining methodologies for dislocation energetics and dynamics," J. M. Rickman and R. LeSar, in Handbook of Materials Modeling. Volume I: Methods and Models}, S. Yip, editor, (Kluwer, Dordrecht, Netherlands, 2005).
• "A kinetic Monte Carlo simulation of thin film growth by physical vapor deposition under substrate rotation," J. Cho, S. G. Terry, C. G. Levi, and R. LeSar, Materials Science and Engineering A 391, 390-401 (2005).
• "Dislocation structures and the deformation of materials," M. Koslowski, R. LeSar, and R. Thomson, Physical Review Letters 93, 265503 (2004).
• "A noise induced transition in the deformation of metals," R. Thomson, M. Koslowski, and R. LeSar, Physics Letters A, 332, 207-212 (2004).
• "Ambiguities in the calculation of dislocation self energies," R. LeSar, Physica Status Solidi (b) 241, 2875--2880 (2004).
• "Avalanches and scaling in plastic deformation," M. Koslowski, R. LeSar, and R. Thomson, Physical Review Letters 93, 125502 (2004).
• "Incorporation of local structure in continuous dislocation theory,'' R. LeSar and J. M. Rickman, Physical Review B 69, 172105 (2004).
• "Modeling cross-hatch surface morphology in growing mismatched layers. Part II: Periodic boundary conditions and dislocation groupings," A.M. Andrews, R. LeSar, M.A. Kerner, J.S. Speck, A.E. Romanov, A.L. Kolesnikova, M. Bobeth and W. Pompe, Journal of Applied Physics 95, 6032--6047 (2004).
• "Multipole representation of the elastic field of dislocation ensembles," Z. Wang, N. M. Ghoniem, and R. LeSar, Physical Review B 69, 174102 (2004).
• "Dislocation motion in thin Cu foils: A comparison between computer simulations and experiment," Z. Wang, N. M. Ghoniem, R. J. McCabe, R. LeSar, and A. Misra, Acta Materialia 52, 1535--1542 (2004).
• "Modeling and simulation of biomaterials," A. Redondo and R. LeSar, Annual Review of Materials Research 34, 279--314 (2004)
• "Course graining of dislocation structure and dynamics," R. LeSar and R. Rickman, in Continuum Scale Simulation of Engineering Materials: Fundamentals - Microstructures - Process Applications, Dierk Raabe, Franz Roters, Frédéric Barlat, and Long-Qing Chen, editors, (Wiley-VCH, Weinheim, Germany, 2004), pp 429-444.
• "Coarse-grained descriptions of dislocation behavior,'' R. LeSar and J. M. Rickman, Philosophical Magazine 83, 3809--3827 (2003).
• "Discrete dislocation simulations of the development of a continuum plastic zone ahead of a Mode III crack," N. Zacharapolous, D. J. Srolovitz, and R. LeSar, Journal of the Mechanics and Physics of Solids 51, 695--713 (2003).
• "Solute effects on dislocation glide in metals," J. M. Rickman, R. LeSar, and D. J. Srolovitz, Acta Materialia 51, 1199--1210 (2003).

• "Scale-Free Intermittent Flow in Crystal Plasticity,'' APS March Meeting, New Orleans, 3/08.
• "Representation of Complex Microstructures: A Data Perspective,'' TMS Annual Meeting, New Orleans, 3/08.
• "Coarse Graining of Dislocation Energetics and Dynamics,'' 44th Annual Technical Meeting of the Society of Engineering Science, Texas A&M, 10/07 (given by J. Rickman).
• "Theory and Simulation of Dislocation Structure and Response,'' Carnegie Melon University, 9/07.
• "Collective behavior of dislocation structure and dynamics: Noise, ordering, and scaling," Cross talks in the Physics of Many-Body Systems, Paris, France, 12/06.
• "Is Computational Materials Science Overrated?," MS&T 2006, Cincinnati, OH, 10/06.
• "Coarse-Grained Model of Biomolecular Structure and Dynamics," TMS Annual Meeting, San Antonio, TX, 2/06
• "Scaling Relations for Dislocation Structure and Response," International Conference on Statistical Mechanics of Plasticity and Related Instabilities, Bangalore, India, 9/05
• "Scaling Relations for Dislocation Structure and Response," Workshop on "Integration of Characterization, Modeling and Rapid Manufacturing," Freiburg, Germany, 5/05
• "Scaling Relations for Dislocation Structure and Response," Summer Institute on Statistical Mechanics and Coarse Graining of Dislocation Behavior for Continuum Plasticity, Deer Creek, Ohio, 5/05
• "Mechanics of Materials: Metals to Microtubules," Ohio State University, 4/05
• "Analytic Model of Bone Remodeling," Biomaterials Symposium, PRICM-5, Beijing, 11/04
• "Coarse-Grained Energetics and Dynamics of Dislocations; Towards a Density Functional Theory of Dislocations," International Workshop on Multiscale Modeling, Los Angeles, 10/04
• "Discrete and Coarse-Grained Dislocation Structure and Dynamics," Workshop on ``Linking Processing to Performance Through Microstructure II'', Freiberg, Germany, 5/04
• "Computational Modeling of Materials: Metals to Biomaterials," Department of Materials Science and Engineering, UCLA, 2/04
• "Computational Modeling of Materials," Department of Materials Science and Engineering, University of Michigan, 1/04
• "Discrete and Coarse-Grained Dislocation Structure and Dynamics," Materials and Manufacturing Directorate, Air Force Research Laboratory, 1/04
• "Structure and Response: Statics and Dynamics of Dislocations," Department of Mechanics, UCLA, 11/03
• "Discrete and Coarse-Grained Dislocation Structure and Dynamics," Department of Materials Science and Engineering, UC Berkeley, 10/03
• "Discrete and Coarse-Grained Dislocation Structure and Dynamics," Department of Applied Science, UC Davis, 10/03
• "Modeling Dislocations in (Nanostructured) Materials," California NanoSystems Institute, UCSB, 5/03
• "Discrete and Coarse-Grained Dislocation Structure and Dynamics," Department of Materials Science and Engineering, Ohio State University 5/03

• Member of the U. S. Air Force Scientific Advisory Board, 2005-present.
• Member of the Editorial Board of the Annual Reviews of Materials Research, 2001-present.
• Editor of Computational Materials Science, Elsevier Press, 1999-2002.
• Associated Western Universities (AWU) Department of Energy Distinguished Lecturer, 1995, “Grand Challenges in Computational Materials Science.”
• NATO Travel Award 1985.
• Gomberg Prize in Chemistry, University of Michigan, 1974.
• James B. Angell Scholar, University of Michigan, 1974.

• Zhiju Zheng
• Caizhi Zhou
• Zach Royer