期刊
MECHANICS OF MATERIALS
卷 137, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mechmat.2019.103102
关键词
Adiabatic shear localization; Impact loading; High speed photography; Stress state; Phenomenological criterion
资金
- National Natural Science Foundation of China [11802029, 11672354, 11527803]
- State Key Laboratory of Explosion Science and Technology [ZDKT18-03]
Shear failure is frequently accompanied with the formation of an adiabatic shear band (ASB) under dynamic loading condition. The results obtained by a previous study (Guo et al., 2019) indicate that temperature increase does not play a primary role in the formation of ASB. Moreover, the shear strain to ASB initiation is closely related to the stress state. In this paper, a hybrid experimental-numerical method is developed to evaluate quantitatively the effect of stress stare on the initiation of ASB within Ti-6Al-4V. A variety of geometries of specimens, including the modified shear-compression, shear-tension, and thin-walled tubular specimen are designed to create different stress states. Combined with high-speed photography, split Hopkinson bar systems are utilized to measure the mechanical response of these specimens. Critical shear strains of ASB initiation are acquired based on the high-speed photos. The stress state for each test condition is obtained by numerical simulation. A phenomenological model of ASB initiation considering stress triaxiality and Lode parameter is proposed. Compared to the experimental results, the proposed model can predict the initiation of ASB with good accuracy under the test condition of this work.
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