Burst behaviour of ±75 ° filament-wound Kevlar/epoxy and carbon/epoxy tubes at high loading rates

• Published in: Composites science and technology 1996, Vol.56 (10), p.1151-1159
• Main Authors: Kaddour, A.S., Al-Salehi, F.A.R., Al-Hassani, S.T.S., Hinton, M.J.
• Format: Article
• Language: English
• Subjects: 75 ° KRP and CFRP tubes; Applied sciences; Composites; Exact sciences and technology; failure properties; filament-wound composites; Forms of application and semi-finished materials; Polymer industry, paints, wood; strain rate; Technology of polymers; wrap-wire gauge
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/S0266-3538(96)00078-4

Burst tests have been carried out on thin filament-wound angle-ply ±75 ° Kevlar-49/epoxy (KRP) and ±75 ° XAS carbon/epoxy (CFRP) tubes at strain rates up to 200/s by means of an internal explosive pressurisation technique. To overcome the limitations of premature failure of foil strain gauges, a wrap-wire gauge was developed which enabled instantaneous measurement of hoop expansion up to the final burst. Full hoop-stress/strain curves were obtained up to the final failure. For tests carried out at strain rates above 10/s, the dynamic response of both materials was characterised by surface cracking or ‘initial failure’, prior to final burst. Surface cracking of the specimens causes degradation of tube stiffness as well as failure of conventional type foil strain gauges. Effects of strain rate on the mechanical properties at initial and final failures are presented.