1. Departments of Civil and Environmental Engineering; Mechanical Engineering, and Materials Science and Engineering; Northwestern University; Evanston IL 60208 USA
2. Department of Engineering Mechanics; Center for Mechanics and Materials; Tsinghua University; Beijing 100084 China
3. Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
4. Institute of Chemical Machinery and Process Equipment; Department of Chemical and Biological Engineering; Zhejiang University; Hangzhou 310027 China
5. Departments of Materials Science and Engineering Chemistry, Mechanical Science and Engineering; Electrical and Computer Engineering; Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials; Research Laboratory; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA