1. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an China
2. High Voltage Switchgear Insulation Materials Laboratory of State Grid Pinggao Group Co., Ltd Pingdingshan China
3. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an China
4. Department of Mechanical Engineering Nagaoka University of Technology Nagaoka Japan