| Autor: |
Leterrier, Yves, Pinyol, Albert, Rougier, Luc, Waller, Judith H., Månson, Jan-Anders E. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Dec2009, Vol. 106 Issue 11, p113508-113513, 5p, 1 Black and White Photograph, 1 Chart, 4 Graphs |
| Abstrakt: |
Damage occurring under tensile loading and the resulting increase in electrical resistance of tin-doped indium oxide and amorphous graphite coatings on various polymer substrates are investigated, using an electrofragmentation method in situ in an optical microscope. The electrical resistance is modeled as a function of damage state assuming that the resistance of coating cracks is proportional to their opening, and that there exists a conducting path of constant thickness at the coating/substrate interface across the crack. The model reproduces the experimental data with good accuracy apart from the damage initiation and saturation stages where it underestimates the measured coating resistance. This is due to the presence of stable cracks of finite length in the initiation stage and delamination in the saturation stage. Impedance spectroscopy measurements confirm the purely resistive nature of the conducting path, whose resistivity is found to be three to four orders of magnitude higher than that of the uncracked coating. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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