Coupling stiffening effect of carbon nanotubes on modulus of nanograined metals:Mechanism and multiscale modeling  

作　　者：WANG Fei LI Li WANG XueLin HU YuJin 

机构地区：[1]State Key Laboratory of Intelligent Manufacturing Equipment and Technology,School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Science China(Technological Sciences)》2024年第11期3513-3523,共11页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52175095);the Key Research and Development Program of Guangxi of China(Grant No.GuikeAB23026106);the Young Topnotch Talent Cultivation Program of Hubei Province of China。

摘　　要：A quantitative relationship between grain size and Young's modulus of metal composites has not been established by considering the coupling effect of the reinforcements on microstructural deformation.The objective of this study is to investigate the mechanism of deformation coordination between the carbon nanotube and the composite microstructure using molecular dynamics simulations.Through the analysis of stress contributions from grain boundaries and grains,a grain size-dependent continuum model for the pure metal modulus is established.On this basis,a predictive model for the modulus of metallic composites is developed by considering the coupling deformation between carbon nanotubes and the grains.The proposed model is capable of accurately capturing the relationship between grain size and the modulus of metal composites.This study provides a guideline for microstructure-dependent multiscale modeling.

关 键 词：nanograined metal carbon nanotube molecular dynamics microstructure analysis grain boundary Young's modulus 

分 类 号：TB33[一般工业技术—材料科学与工程]