Effective elastic moduli and interface effects of nanocrystalline materials |
| |
Authors: | Gangfeng Wang Xiqiao Feng Shouwen Yu |
| |
Institution: | (1) Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, China |
| |
Abstract: | Many properties of nanocrystalline materials are associated with interface effects. Based on their microstructural features,
the influence of interfaces on the effective elastic property of nanocrystalline materials is investigated. First, the Mori-Tanaka
method is employed to determine the overall effective elastic moduli by considering a nanocrystalline material as a binary
composite solid consisting of a crystal or inclusion phase with regular lattice connected by an amorphous-like interface or
matrix phase. The effects of strain gradients are then examined on the effective elastic property by using the strain gradient
theory to analyze a representative unit cell. Two interface mechanisms are elucidated that influence the effective stiffness
and other mechanical properties of materials. One is the softening effect due to the distorted atomic structures and the increased
atomic spacings in interface regions, and the other is the baffling effect due to the existence of boundary layers near interfaces. |
| |
Keywords: | nanocrystalline material elastic modulus microstructure interface strain gradient |
本文献已被 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |