C. Bertin, J. Guastavino, M. Briot, A. Campus, P. Druot
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Direct optical observation of polyethylene microstructures under field and temperature conditions, before any degradation
An approach was made to understand the role played by the microstructure of a LPDE in the ageing process of this material under electric stress. An optical observation and an image treatment of the structure evolution reveal a physical behaviour comparable to a "fatigue process". Although the applied field was about 35 times the working field of a cable we have not observed any tree in the samples.