1994 Volume 43 Issue 495 Pages 1525-1531
The fatigue properties of short fiber reinforced polycarbonate fabricated with injection molding were discussed. As the results, it appeared that the fatigue properties are affected by surface treatment of fibers, fiber content, frequency of testing, etc.. The effect of surface treatment was same as that in tensile test. It indicated that the optimization of surface treatment can be executed by comparing the tensile strength of products. The specimen treatment with an aminosilane coupling agent and a urethane binder showed the best fatigue property in this study. By this treatment, the fatigue limit increased with increasing fatigue frequency. It can be attributed to the decrease of AE energy during testing. The frequency dependence, however, changed to quite the opposite under the elastic limit when the fiber content was 10wt%. It was caused by the thermal failure occurring at the surface of specimen.