Abstract
The present paper is devoted to the fatigue evaluation of material or structure based on thermodynamic entropy approach. The fracture occures once the cumulative entropy reaches a critical value, the fracture fatigue entropy(FFE). Therefore, in this paper, the relationship between entropy and F-N curves is studied, and an entropy-load-number of cycles(E-F-N) surface is developed. Meanwhile, the FFE-based F-N curve can be obtained at the critical entropy value. To verify the utility of proposed method, the E-F-N surface and FFE-based F-N curve are applied to the fatigue evaluation of spot welded joints during high-cycle fatigue. It is shown that the E-F-N surface can effectively represent the fatigue performance. And the accuracy of the FFE-based F-N curve is confirmed by comparing with the traditional traditional three-parameter power function F-N curve. The maximum relative error of the fatigue limits obtained by two different methods is 10.9 %.
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