期刊
METALS
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/met11010155
关键词
biaxial tensile behavior; titanium; load ratio; strain rate; constitutive model
资金
- National Natural Science Foundation of China [51675260, 51975271, 51475223]
Experimental results show that commercially pure titanium biaxial tensile samples have higher strength than uniaxial samples, with equi-biaxial samples exhibiting the highest strength. Additionally, an increase in strain rate leads to a significant improvement in tensile strength. Fractographic analysis indicates that the shape and size of dimples are dependent on the load ratio and strain rate.
The aim of the present work is to contribute to the characterization of the biaxial tensile behavior of commercially pure titanium, under various in-plane loading conditions at room temperature, by a non-contact digital image correlation system. Several loading conditions, with load ratio ranging from 4:0 to 0:4 and displacement rate ranging from 0.001 to 0.1 mm/s, are examined. It is found that the yield strength and ultimate tensile strength of biaxial sample are greater than that of uniaxial sample, where the equi-biaxial sample shows the highest strength. It is also observed that increase in strain rate leads to remarkable improvement of tensile strength. Fractographic analysis indicates that the shape and size of dimples are load ratio and strain rate dependent. Additionally, a modified Johnson-Cook constitutive model was proposed to account for the effect of strain rate on biaxial tensile deformation. The experimental results are in good agreement with the simulated results, indicating that the proposed model is reliable to predict biaxial tensile deformation of commercially pure titanium at different strain rates.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据