A new technique for the ultrasonic detection of internal transverse cracksin carbon-fibre/bismaleimide composite laminates

Citation
K. Maslov et al., A new technique for the ultrasonic detection of internal transverse cracksin carbon-fibre/bismaleimide composite laminates, COMP SCI T, 60(12-13), 2000, pp. 2185-2190
Citations number
13
Categorie Soggetti
Material Science & Engineering
Journal title
COMPOSITES SCIENCE AND TECHNOLOGY
ISSN journal
02663538 → ACNP
Volume
60
Issue
12-13
Year of publication
2000
Pages
2185 - 2190
Database
ISI
SICI code
0266-3538(200009/10)60:12-13<2185:ANTFTU>2.0.ZU;2-
Abstract
Through-transmission ultrasonic C-scan imaging with inclined focusing trans ducers in confocal configuration has been used for the detection of partial and internal cracks in a cross-ply, [0/90/0] carbon/epoxy laminate. A numb er of partial cracks (intersecting only one edge of a coupon) as well as co mpletely internal cracks were found ultrasonically after the sample was sub jected to static loading. The validation of the result by cutting the sampl e along two lines :in the 0 degrees direction and checking the presence of the internal cracks with an optical microscope shows a good correlation bet ween the ultrasonic image and the optical data. Experimental results show t hat in the IM7/5250-4 composite, which contains a toughened BMI resin, init iation of transverse cracks under static loading occurs with the formation of partial cracks not necessarily originating at the edge of the sample. (C ) 2000 Elsevier Science Ltd. All rights reserved.