Modeling and simulation of size effects in metallic glasses with a nonlocal continuum mechanics theory

Journal of the Mechanical Behavior of Materials

Bargmann Swantje¹  Klusemann Benjamin² 

[1] ;Institute of Continuum Mechanics and Materials Mechanics, Hamburg University of Technology, Hamburg, Germany;

关键词: constitutive model;    finite element method;    metallic glass;    shear localization;    size effect;    viscoplasticity;   

DOI  :  10.1515/jmbm-2013-0009

来源: DOAJ

【 摘 要 】

The present contribution is concerned with the modeling and computation of size effects in metallic glasses. For the underlying model description, we resort to a thermodynamically consistent, gradient-extended continuum mechanics approach. The numerical implementation is carried out with the help of the finite element method. Numerical examples are presented and compared with existing experimental findings to illustrate the performance of the constitutive model. In this regard, the influence of the material length scale is investigated. It is shown that with decreasing sample size or decreasing material length scale, a delay of the shear localization is obtained. In addition, the tension-compression asymmetry observed in experiments is captured by the proposed model. Further, the rate-dependent behavior as well as the influence of the results to initial local defects are investigated.

【 授权许可】

Unknown