The purpose of this study is to reveal the mechanism of the high-voltage electric pulsed test. The artificial samples were tested by the high-voltage electric pulsed test. Toestimate the current path and analyze the fractures at grain boundaries, the samples were observed by using Micro CT, before and after the test. The fracture patterns were divided into 2 types, being the "multi fracture pattern" and the "single fracture pattern".
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