2009 Volume 50 Issue 12 Pages 2826-2832
Homogeneous low voltage electron beam irradiation (HLEBI) improves the Charpy impact value (auc) of composites sheets of carbon fiber reinforced thermoplastic polyetheretherketone (CFRTP) with 2 mm thickness, although the irradiated depth estimated is 177±32 μm at their both sides surface. The auc values at low fracture probability (Pf) of 0.13 for CFRTP irradiated at 0.43 MGy (kJg−1) is 78 kJm−2, which is 56% higher than that (50 kJm−2) for CFRTP before irradiation. Although the lowest impact values (as) estimated by three parameters Weibull equation is zero for CFRTP before irradiation, HLEBI enhances the as value. The highest as value is more than 55 kJm−2 for CFRTP irradiated from 0.43 to 0.65 MGy. Thus, HIEBL remarkably enhances the as value, as well as the auc value at low Pf value. Since HLEBI enhances the Weibull coefficient (n), it also enhances the reproducibility of CFRTP samples. The maximum n value is found at 0.43 MGy of HLEBI dose. The interfacial friction force, as well as the strengthening of both carbon fiber and polyetheretherketone probably contributes the HLEBI effects to enhance the as value of CFRTP, as well as enhancement of reproducibility.