Damage evaluation by means of electrical resistivity measurements

Citation
S. Motahhari et al., Damage evaluation by means of electrical resistivity measurements, POLYM POL C, 8(7), 2000, pp. 449-453
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
POLYMERS & POLYMER COMPOSITES
ISSN journal
0967-3911 → ACNP
Volume
8
Issue
7
Year of publication
2000
Pages
449 - 453
Database
ISI
SICI code
0967-3911(2000)8:7<449:DEBMOE>2.0.ZU;2-E
Abstract
Electrical resistivity has been used to detect the internal damage in glass fibre-polyester composite sheet materials. It is shown that the introducti on of microstructural damage to the composite increases the electrical resi stivity in a direction perpendicular to the plane in which the fibres lie. In these experiments, the samples were subjected to some predetermined valu e of impact energy using a drop weight tester. The impact energy causes fib re-matrix debonding and microcrack propagation within the matrix and fibres . The measurement of the electrical resistivity before and after impact rev eals a linear relation between the electrical resistivity and the magnitude of the applied impact energy. The reproducibility of the data was higher ( within +/-2%) for the less damaged samples. For the more severely samples, however, the reproducibility was poorer (within +/-8%). This is a good feat ure, as the extent of damage in the less severely damaged samples cannot be detected by visual inspection.