**Author details**

Jinyu Zhang\*, Gang Liu\* and Jun Sun\*

\*Address all correspondence to: jinyuzhang1002@mail.xjtu.edu.cn, lgsammer@mail.xjtu.edu.cn and junsun@mail.xjtu.edu.cn

State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, PR China
