Damage Characteristics of Al Alloy 3003 Suffered fromThree Continuous Impulse Currents
Liu Yakun1, Dai Mingqiu1, Bi Xiaolei2, Liu Juan2, Fu Zhengcai1
1. Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China; 2. State Key Laboratory of Chemicals Safety China Petroleum & Chemical Corporation Safety Engineering Institute Qingdao 266071 China;
Abstract Research on the damage characteristics of metal material subjected to the multiple continuous impulse currents (MCIC) is an effective method to reveal the damage mechanisms of metal suffered from natural lightning. Therefore, the damage morphology on surface, microstructure in the cross section, element composition changes, and micro-hardness changes are measured and compared under MCIC and single impulse current (SIC). The influence of the MCIC on metal damage is discussed. The results show that, under the combined current of a rectangular waveform with a current amplitude of 404A, a 30/80μs impulse with a current amplitude of 150kA and a 2ms square waveform with a current amplitude of 2kA, the damaged area of Al alloy 3003 is 3 156.0mm2, the damaged depth is 4.7mm, the oxygen content increases by 35.56%, and the micro-hardness increases to 78.5. The results increase by 15.5%, 42.4%, 21.3%, and 2.7%, respectively, compared with the counterparts of SIC. The crack phenomenon of metal intensifies in the case struck by MCIC.
Liu Yakun,Dai Mingqiu,Bi Xiaolei等. Damage Characteristics of Al Alloy 3003 Suffered fromThree Continuous Impulse Currents[J]. Transactions of China Electrotechnical Society, 2020, 35(6): 1173-1180.
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2020, Vol. 35 
