A new method to evaluate material fatigue behavior

摘要

A new technique, the wavelet-based AE technique, was developed to investigate material fatigue behavior. In this study, an analog model was established using "clean" AE signal. The model was linearized to find the corresponding material constants. Specimens of Palacos R cement fabricated using both HM and VM methods were tested to demonstrate the proposed model. It was found that the material constants (the slopes of the test curve) were consistent regardless of the fabrication methods. However, there was a significant difference between the intercepts of the test curves when AE techniques were used, whereas the classical fracture mechanics approach failed to distinguish this difference. It was found that the slope and intercept of a test curve can be used as indicators to evaluate material fatigue behavior. In addition, the results showed that the proposed method provided a more accurate estimation of the material constant (slope) in the fatigue model. (C) 2001 Kluwer Academic Publishers. [References: 19]