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Energy-Release Rate in Electrically Deteriorated Materials Introduced by Using Maxwell Stress Tensor at Crack Tip.
Energy-Release Rate in Electrically Deteriorated Materials Introduced by Using Maxwell Stress Tensor at Crack Tip.
- Source :
-
IEEE Transactions on Dielectrics & Electrical Insulation . Dec2021, Vol. 28 Issue 6, p1925-1932. 8p. - Publication Year :
- 2021
-
Abstract
- Despite the importance of the electric treeing phenomenon, a detailed understanding of the mechanisms is still lacking. Therefore, in this study, we analyze electrical trees as composites of very thin 3D tubes between a treeing needle and a plate electrode and calculate the energy-release rate to estimate the prerequisite force required for crack propagation. This study implements a new method using an analogy between concepts of fracture mechanics and Maxwell stress to calculate the energy-release rate of line-shape elements. We obtain the energy-release rate around a volume near the treeing needle and electrical trees and compare it before and after tree growth. To verify the results, path independence is tested, and it is found to be conserved only when the path does not include the inside surface of the treeing needle. In addition, the results show that the 1D-growth of the tree has little effect on the value of the energy-release rate, and therefore, it is necessary to predetermine the order and an adequate calculation area. Moreover, the value of the energy-release rate is found to be proportional to the square of the applied voltage. These results imply that calculating the energy-release rate exhibits a potential to mathematically evaluate the growth of electrical trees. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10709878
- Volume :
- 28
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Dielectrics & Electrical Insulation
- Publication Type :
- Academic Journal
- Accession number :
- 154801045
- Full Text :
- https://doi.org/10.1109/TDEI.2021.009692