The rapid development of synthesis and characterization of materials with feature sizes at nanoscale as well as unprecedented computational power have brought forth a new era of materials research in which experiments, modeling and simulations are performed side by side to probe the unique mechanical properties of nanostructured materials. Here, we report some recent studies on mechanics of nanotwinned materials in engineering and biological systems, including the maximal strength of nanotwinned metals, crack bridging by nanotwins in thin films, twin-spacing-induced ductile-brittle transition in nanotwinned nanopillars, and toughness enhancement in hierarchical nanotwinned biological materials. In each study, there has been a strong synergy between theory and experiment, with new experimental findings driving advances in modeling and simulations, and new theoretical insights suggesting new experimental studies. The discussions will be organized around the current understandings based on existing experimental and theoretical efforts, as well as the outstanding questions that require further studies in the future.
About the Speaker
Huajian Gao received his B.S. degree from Xian Jiaotong University of China in 1982, and his M.S. and Ph.D. degrees in Engineering Science from Harvard University in 1984 and 1988, respectively. He served on the faculty of Stanford University between 1988 and 2002, where he was promoted to Associate Professor with tenure in 1994 and to Full Professor in 2000. He served as a Director at the Max Planck Institute for Metals Research between 2001 and 2006 before joining the Faculty of Brown University in 2006. At present, he is the Walter H. Annenberg Professor of Engineering at Brown.
Professor Gao’s research is focused on the understanding of basic principles that control mechanical properties and behaviors of materials in both engineering and biological systems. He is a Member of the National Academy of Engineering and a co-editor-in-chief of the Journal of the Mechanics and Physics of Solids, the flagship journal of his field. He is also the recipient of numerous academic honors, from a John Simon Guggenheim Fellowship in 1995 to recent honors including the Rodney Hill Prize in Solid Mechanics from the International Union of Theoretical and Applied Mechanics in 2012.
Hosts: Taher Saif & Petros Sofronis
* Times, dates and titles are subject to change. Check mechanical.illinois.edu for updated information. This seminar counts toward the requirements for ME 590 and TAM 500.