Materials Transactions Online

Materials Transactions, Vol.50 No.12 (2009) pp.2826-2832
© 2009 The Japan Institute of Metals

Effects of Electron Beam Irradiation on Impact Value of Carbon Fiber Reinforced Thermoplastic Polyetheretherketone

Yoshitake Nishi1,2,3, Hiroaki Takei1, Keisuke Iwata2, Michelle Salvia4 and Alain Vautrin3

1Graduate School of Metallurgical Engineering, Tokai University, Hiratsuka 259-1292, Japan
2Doctoral Graduate School of Science and Engineering, Tokai University, Hiratsuka 259-1292, Japan
3Department of Mechanical and Materials Engineering, Ecole Nationale Superieure des Mines de Saint-Etienne, Saint-Étienne Cedex 2 42023, France
4Ecole Centrale de Lyon, Ecully Cedex 69134, France

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.

(Received 2009/6/19; Accepted 2009/9/25; Published 2009/11/18)

Keywords: thermoplastic, polyetheretherketone, carbon fiber, electron beam irradiation, impact value

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