Study on the Creep Damage Constitutive Models of 16MND5 Steel for Domestic Reactor Pressure Vessel
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摘要: 为了获得反应堆压力容器（RPV）材料在高温下的蠕变行为，保证RPV在严重事故工况下的完整性，本研究对国产RPV用16MND5钢的高温蠕变性能进行了测试，获得了600~900℃下材料的蠕变性能，并基于应变强化的基本蠕变本构模型与基于延性耗竭理论的蠕变损伤模型，建立了适用于16MND5钢的蠕变损伤本构模型，给出了材料的蠕变损伤模型参数。结果表明，本文提出的蠕变损伤本构模型的有限元模拟数据与试验数据符合性较好，验证了此蠕变损伤模型的正确性。该方法可用于严重事故情况下RPV的蠕变损伤分析，为RPV的完整性分析提供支持。
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关键词:
- 反应堆压力容器（RPV） /
- 完整性分析 /
- 高温蠕变 /
- 蠕变损伤本构模型.
Abstract: In order to obtain the creep behavior of reactor pressure vessel (RPV) materials at high temperature and ensure the integrity of RPV under severe accident conditions, the high temperature creep properties of 16MND5 steel for domestic RPV were tested, and the creep property of the material at 600~900℃ was obtained. Based on the basic creep constitutive model of strain strengthening and the creep damage model based on ductile depletion theory, a creep damage constitutive model suitable for 16MND5 material is established, and the creep damage model parameters are given. Results show that the finite element simulation data of the creep damage constitutive model proposed in this paper are in good agreement with the experimental data, which verifies the correctness of the creep damage model. This method can be used for the creep damage analysis of RPV under serious accidents, and provide support for the integrity analysis of RPV. -
图 1 国产RPV用16MND5钢的高温蠕变试验结果
Figure 1. Creep Test Results of 16MND5 Steel for Domestic RPV at High Temperature
图 2 典型的蠕变应变-时间曲线
$ {t_{\text{f}}} $—发生蠕变断裂的时间；$ {\varepsilon _{\text{f}}} $—发生蠕变断裂时的应变，即蠕变延性
Figure 2. Typical Creep Strain-Time Curve
图 3 800℃下蠕变试验第一阶段曲线拟合
Figure 3. Curve Fitting of the First Stage of Creep Test at 800℃
图 4 根据不同应力水平下的n值绘制的n-σeq曲线
Figure 4. n-σeq Curve Drawn by n Values at Different Stress Levels
图 5 根据不同应力水平下的d值绘制的d-σeq曲线
Figure 5. d-σeq Curve Drawn by d Values at Different Stress Levels
图 6 蠕变损伤本构模型的计算值与试验值的对比
Figure 6. Comparison between Calculated and Experimental Values of Creep Damage Constitutive Model
表 1 国产RPV用16MND5钢在600℃以上的屈服强度
Table 1. Yield Strength of 16MND5 Steel for Domestic RPV above 600℃
温度/℃ 600 700 800 900 1000 屈服强度/MPa 243.3 99.3 50.7 36.0 23.5 
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表 2 不同温度下16MND5钢的蠕变损伤本构模型参数
Table 2. Creep Damage Constitutive Model Parameters of 16MND5 Steel at Different Temperatures
温度/℃ 蠕变参数 A n1 n2 n3 m d1 d2 d3 β 600 5.73×10−22 6.622 9.362 −0.041 −0.550 −11430.075 44826.022 −0.009 0.36 700 5.73×10−22 8.115 7.833 −0.070 −0.865 655.602 84209.310 −0.081 0.45 800 5.73×10−22 9.917 13.487 −0.154 −0.865 7040.816 191043.500 −0.212 0.45 900 5.73×10−22 10.001 11.464 −0.126 −0.865 158.151 36234.250 −0.183 0.45
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