2004 Volume 22 Pages 31-38
In the present study, mechanical properties of a heat-resistant CFRP, G 40-800/5260, carbon/bismaleimide system are investigated experimentally. Laminate configurations are unidirectional [0]5and angle-ply [30/-30]S, [45/-45]S, [60/-60]S laminates. On-and off-axis tensile tests are performed on the unidirectional laminates. Tensile tests are conducted on the angle-ply laminates. The specimen size was 150 mm long and 10 mm wide. In order to investigate the effect of temperature on the mechanical properties, the tests are performed at the room temperature and 100°C. The temperature dependence of the mechanical properties is discussed. To model the nonlinearity in the stress-strain behavior of the unidirectional laminates, the one-parameter plasticity model is used. A master curve of the effective stress-effective plastic strain relation at each temperature is obtained which proves that the oneparameter plasticity model is valid for this material system. An attempt is also made to combine the one-parameter plasticity model and the classical lamination theory to predict the stress-strain relation of the angle-ply laminates.