THREE-DIMENSIONAL FINITE ELEMENT SOLUTION FOR THE SIZE-DEPENDENT EFFECTIVE MODULI OF NANOPOROUS MATERIALS
In nanomaterials, the effects of surface/interface on mechanical deformation become important as the ratio of the number of surface atoms to the total atoms increases drastically when compared with bulk materials. The size-dependent mechanical behavior of nanomaterials can be explained within the framework of classical continuum mechanics by including the effects of surface/interface stress. In this study, a user subroutine usermat. f is developed to implement the Gurtin-Murdoch surface stress-strain model through the User Programmable Features (UPF) of the finite element code ANSYS. The program is used to obtain the effective elastic moduli of nanoporous aluminum with cubic representative volume element (RVE) and spherical pores via the direct homogenization method. It has been shown that both the effective bulk and shear moduli of nanoporous aluminum change with the radius of the spherical pore and they are also dependent on the surface elastic constants.
nano materials finite element method size dependency surface stress
Shuanglong Yao Xianwei Zeng Qingdun Zeng
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641 China
国际会议
广州
英文
146-151
2010-12-17（万方平台首次上网日期，不代表论文的发表时间）