Numerical Study on the Fatigue Limit of Metallic Glasses under Cyclic Tension-Compression Loading

Materials

Wenjun Meng¹  Zhi Chen¹  Hong Guo¹  Xianguo Yan¹  Jinfeng Yan¹ 

[1] School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;

关键词: metallic glass;    shear band;    fatigue life;    free-volume theory;    hydrostatic stress;   

DOI  :  10.3390/ma13071732

来源: DOAJ

【 摘 要 】

Numerical study was performed to determine the fatigue limit of metallic glass under tension-compression cyclic loading. A revised free-volume theory which considers the hydrostatic stress was utilized to make the predictions. Systematical simulations showed that a higher strain amplitude is prone to making the sample completely damaged earlier. However, lower strain fluctuations could result in a longer fatigue life. Shear banding evolution history described by free-volume localization could reasonably explain the mechanical responses of different samples. In addition, compressive loading could give rise to a higher stress than that under tensile loading because of hydrostatic stress contribution. In the end, a correlation between fatigue life and applied strain amplitude was plotted which could supply a guidance for designing the engineering application of metallic glass under periodic loading.

【 授权许可】

Unknown