报告题目：

Gradient Continuum Nanomechanics: Applications to Nanoelasticity, Nanoplasticity and Nanodifussion

报告人:              Prof. Elias C. Aifantis

Aristotle University of Thessaloniki, Greece

时间：2014年12月1日(周一)   15:00

地点：中国科学院力学研究所主楼344会议室

报告摘要：

Nobel laureate Richard Smalley's quotation "The Laws of Continuum Mechanics are amazingly robust for treating even intrinsically discrete objects only a few atoms in diameter" appears to be applicable for a wide range of nanoscale materials and processes involving elastic and plastic deformations, as well as diffusion processes. Robust nanoelasticity, nanoplasticity and diffusion models can result by incorporating an extra Laplacian term in the standard equation of elasticity, plasticity and diffusion. As a result strain/stress singularities at dislocation lines and crack tips can be eliminated, incipient and intermittent stress-strain curves can be effectively interpreted, and size-dependent phase diagrams may be constructed. The examples of adiabatic shear banding and size-dependent spinodal gaps are discussed. When evolution equations are not available to describe the statistical distribution of the experimentally recorded deformation characteristics (stress drops, strain bursts), it is shown that Tsallis' non-extensive thermodynamics can be used to fit the observed power-law behavior that cannot be modeled by using conventional Boltzmann-Gibbs-Shannon thermodynamics.

报告人简介：

Elias C. Aifantis is Professor of Mechanics at the Aristotle University of Thessaloniki. Prior to that he held faculty appointments at Michigan Tech, at the University of Minnesota and the University of Illinois at Urbana-Champaign. He has published ~530 articles in journal and proceedings [citations: ~7630/ISI, ~6600/SCOPUS; h-index: 43/ISI, 37/SCOPUS]. He is included in the Thomson Reuters list of Highly Cited Researchers in Engineering. He quoted the terms "material instabilities", "dislocation patterning", "chemomechanics", "nanomechanics" and helped promoting the scientific disciplines know today as "gradient elasticity" and "gradient plasticity", through his early papers on these subjects in 1984 and 1992 respectively.

报告联系人：沈楠  (office@lnm.imech.ac.cn 82543935)