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应变能-频率分离法(SEFS)为频率分离法(FS)和频率修正损伤函数法(Ostergren M)的分析、综合与修正。SEFS法提出预测高温低周疲劳寿命的自变量为非弹性应变能、拉伸进程的频率(V_t)及拉压进程的时间比(V_c/V_t),即用Ostergren公式中的损伤函数代替FS中的非弹性应变(△in)。并用这三种方法对国产材料GH33A(700℃)、1Crl8Ni9Ti(600℃)与国外九种材料及相应工艺的现有试验数据进行验证,结果表明,SEFS比FS和Ostergren M的预测能力有所改进。
The strain energy-frequency separation method (SEFS) is the analysis, synthesis and correction of the frequency separation method (FS) and the frequency-modified damage function method (Ostergren M). The SEFS method proposed that the independent variable of predicting the high temperature and low cycle fatigue life is the inelastic strain energy, the frequency of stretching process (V_t) and the time ratio of pulling process (V_c / V_t), that is, replacing the FS with the damage function in Ostergren’s formula Of inelastic strain (△ in). The experimental data of domestic materials GH33A (700 ℃), 1Crl8Ni9Ti (600 ℃) and nine kinds of foreign materials and their corresponding processes were verified by these three methods. The results show that the prediction ability of SEFS to FS and Ostergren M is improved .