Paper number 1292


Peter A. Zinoviev1, Sergey V. Tsvetkov2, Gennadii G. Kulish2, Robert W. van den Berg3 and Van Schepdael Ludo J.M.M.4

1Institute of Composite Technologies, Box 5, Himky-10, Moscow Region, 141400 Russia
2Moscow State University of Technology, 2-nd Baumanskaya Str., Bldg 5 107005 Russia
3Instituut voor Agrotechnologisch Onderzoek, Bornsesteeg 59, Postbus 17
6700 AA Wageningen, the Netherlands
4System Development Engineering, Industrieterrein 11, B-3890 Gingelom, Belgium

Summary The experimental study was carried out on the dependence of strength of unidirectional fibrous composites upon superposed hydrostatic pressure up to 500 MPa. Ring samples made of carbon and glass fiber reinforced plastics were tested under longitudinal tension. The tests showed that, as pressure increased (approximately up to p = 300 MPa), the longitudinal tensile strength of both composites increased. However, on further increasing pressure (up to p = 500 MPa) the strength decreased. It was found in the tests that the failure mode of unidirectional composites depended on the magnitude of superposed hydrostatic pressure. Failure modes differed in the position of the failure zone and the propagation of longitudinal cracks within the sample. The failure zone covered practically the whole volume of the sample at atmospheric pressure. As pressure increased, the failure zone localized. At pressure p (300 MPa, there was a single crack transverse to the fiber direction.
Keywords carbon fiber reinforced plastic, glass fiber reinforced plastic, longitudinal tension, hydrostatic pressure, strength, modulus of elasticity, failure mode.

Theme : Tests Methods and New Metrologies

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