Modeling the Mechanical Behavior of Materials at Small Scales
عنوان:
مدلسازی رفتار مکانیکی مواد در ابعاد کوچک
Title:
Modeling the Mechanical Behavior of Materials at Small Scales
Speaker: Dr. Kamyar M. Davoudi
Affiliation: School of Engineering and Applied Sciences, Harvard University
Abstract:
Detailed and quantitative understanding of the mechanical behavior of materials at small scales is essential for a reliable design of micro and nano devices. Experiments have shown that the plastic response of materials at the micron and sub micron scales can be very different from that of the same material in bulk form. These observations have led to the mantra of “smaller is stronger.” Classical continuum theories do not suffice for describing this size effect due to lack of any length scale in their constitutive equations. Similar to plasticity in bulk materials, plastic flow in crystalline solids at small scales arises mainly from the collective motion of dislocations. In this talk, we model the plastic response of crystalline solids and try to explain why materials at the micro and nano scales are much stronger than the same materials at the macro scale.
Date and time: 6 Mordad 95 (July 27, 2016), 14:00-15:00