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针对具体工程结构的疲劳特性,结合不同应力疲劳曲线模型(S-N曲线的幂函数模型、Weibull模型、双折线模型)和等寿命曲线模型(Goodman模型和Gerber模型),分别建立细节疲劳强度额定值(DFR)表达式,对传统的基于幂函数型S-N曲线和Goodman型等寿命曲线建立的DFR法进行拓展,并通过算例分析其对结构疲劳寿命评估结果的影响。结果表明:与传统的DFR法相比,拓展后的DFR法提高了对结构不同疲劳安全性设计要求的适用性,实现了其在结构低周和超高周疲劳分析中的应用。
According to the fatigue characteristics of specific engineering structures, fatigue strength ratings (fatigue strength ratings, fatigue strength ratings, fatigue strength ratings, fatigue strength ratings, DFR) expression, the traditional DFR method based on power function type SN curve and Goodman type isochronous curve is extended, and the influence of DFR method on structural fatigue life assessment results is analyzed through a numerical example. The results show that compared with the traditional DFR method, the extended DFR method can improve the applicability of different fatigue safety design requirements of the structure and realize its application in fatigue analysis of low-cycle and ultra-high-cycle structures.