Abstract
In this study, high temperature fatigue crack propagation test of the engineering plastic material was carried out in order to clarify the effect of loading rate on the fatigue crack propagation property at the high temperature environment above Tg. Then, failure mechanism and loading rate dependence were evaluated. (1) The resistance against the crack propagation at 30 Hz that was high loading rate was more excellent than that at 10 Hz and 3 Hz which was low-loading rate. And, the resistance against the crack propagation at 10 Hz was equivalent to that at 3 Hz. (2) The resistance against the crack propagation of R 1 material remarkably decreased in comparison with that of virgin material. However, the resistance against the crack propagation of R 3 material was almost equal to that of R 1 material. (3) From the fractography using SEM the fracture surface at high loading rate was a brritle form, and the effect by the fatigue was big. In the meantime, that at low loading rate was a ductile form, and it seemed to overlap fatigue and creep. The viscoelastic effect of the matrix seems to remarkably appear in the fracture surface at low loading rate. (4) It was proven that the process zone dimension and the reinforced fiber length influenced the difference between fatigue crack proagation mechanism at the high loading rate and that at the low loading rate.
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