Impact of obstacles on dislocation patterning and stress correlations

J. M. Rickman,1,* M. Haataja,2,3,† and R. LeSar4,‡ 1Department of Materials Science and Engineering and Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015, USA 2Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, USA 3Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, New Jersey 08540, USA 4Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA Received 11 June 2007; revised manuscript received 18 December 2007; published 6 May 2008