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Grain size effects on dynamic fracture instability in polycrystalline graphene under tear loading

Published online by Cambridge University Press:  13 March 2019

Yuxin Zhao
Affiliation:
College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan 610064, People’s Republic of China; and The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People’s Republic of China
Yunfei Xu
Affiliation:
The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People’s Republic of China
Xiaoyi Liu
Affiliation:
The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People’s Republic of China
Jun Zhu*
Affiliation:
College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan 610064, People’s Republic of China
Sheng-Nian Luo*
Affiliation:
The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People’s Republic of China; and Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: zhujun01@163.com
b)e-mail: sluo@pims.ac.cn
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Abstract

The stability of dynamic fracture is a fundamental and challenging problem in the field of materials science. The grain size effect on dynamic fracture instability in polycrystalline graphene under tear loading is explored via theoretical analysis and molecular dynamics simulations. The fracture stability phase diagram in terms of grain size and crack propagation velocity is obtained, and three regions of crack propagation are identified: stable, metastable, and unstable. For grain size above 2 nm, there exists a critical velocity beyond which fracture instability occurs, and this critical velocity depends linearly on grain size. Decreasing grain size leads to reduced characteristic time for correction of crack path deflection, which plays a dominant role in dynamic fracture instabilities. However, when grain size is below 2 nm, there does not exist a critical velocity for steady propagation of cracks due to discontinuous effects. Our results also provide a valuable insight into dynamic fracture of polycrystalline graphene as well as other 2D and quasi-2D materials.

Type
Invited Paper
Copyright
Copyright © Materials Research Society 2019 

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