对N18锆合金和SAPH440板材采用薄片漏斗试样进行了室温下的等幅低周疲劳试验,基于局部应力、应变相等的疲劳损伤等效原理,建立了用于估算N18和SAPH440材料疲劳寿命的Manson-Coffin模型和循环应力-应变方程。对于符合Masing律的材料,提出了一种获得循环本构关系的新方法,用转子材料B65A-S在300℃高温下的低周疲劳试验进行了验证。通过基于标定循环本构关系的有限元分析,建立了两种材料薄片漏斗试样平均应力到漏斗根部轴向应力、测试应变到漏斗根部轴向应变的转换模型。完成了SAPH440材料等直圆棒试样的低周疲劳试验,证明了采用薄片漏斗试样的低周疲劳测试新方法具有较高的精度。 Based on the theory of fatigue damage equivalent to local stress and strain, the fatigue test of N18 zirconium alloy and SAPH440 sheet with sheet funnel at room temperature was carried out. Manson -Coffin model and cyclic stress-strain equation. For Masing law-compliant materials, a new method for obtaining the cyclic constitutive relationship was proposed. The rotor material B65A-S was tested at a low cyclic fatigue test at a high temperature of 300 ℃. Through the finite element analysis based on the constitutive relationship of calibration cycle, two models of the stress transfer from the average stress of the funnel specimen to the root of the funnel and the axial strain of the funnel root were tested. The low cycle fatigue test of straight round rod specimen such as SAPH440 material was completed, which proves that the new method of low cycle fatigue test using thin sheet funnel specimen has higher accuracy.