Research on Strong Dynamic Load Transfer Characteristics of Nuclear Pipe
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摘要: 基于管道材料在不同温度和应变率下的力学性能构建了应变率相关弹塑性本构模型，通过对管道跌落试验进行仿真得到影响弹塑性分析精度的主要因素，构建了基于应变率相关本构模型的弹塑性动态载荷传递分析方法。应用该方法开展管道动态响应分析，将响应加速度、应力等计算结果与弹性分析结果进行对比。结果显示，弹塑性分析可有效降低结构响应，既可确保结构在强动态载荷下的安全性，又可降低结构设计难度，可应用于管道系统强动态载荷传递分析。Abstract: A strain rate-depended elastic-plastic constitutive model is constructed based on the mechanical properties of main pipe material at different temperatures and strain rates. The main factors affecting the precision of elastic-plastic analysis method are obtained by simulation of pipe drop test, and an elastic-plastic dynamic load transfer analysis method based on the strain rate-dependent constitutive model is established. The dynamic response analysis of pipe is carried out by using this method, and the calculated results of response acceleration and stress are compared with the results of elastic analysis. The results show that the elastic-plastic analysis can effectively reduce the structural response. The method cannot only ensure the safety of structures under strong dynamic load, but also reduce the difficulty of structure design, and can be applied to the strong dynamic load transfer analysis of pipe system.
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Key words:
- Pipe /
- Strong dynamic load /
- Transfer characteristics /
- Strain rate effect
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图 1 316LN材料双线性和多线性本构模型曲线
Figure 1. Bilinear and Multilinear Material Constitutive Model Curves of 316LN
图 2 常温下316LN材料屈服强度与应变率关系
Figure 2. Relationship Between Yield Strength and Strain Rate of 316LN at Room Temperature
图 5 试验台面与管道中部加速度时程
Figure 5. Acceleration Time History of Test Bench and Middle Part of Pipe
表 1 316LN材料屈服强度
Table 1. Yield Strength of 316LN
准静态不同温度 室温不同应变率 温度/℃ 屈服强度/MPa 应变率/s−1 屈服强度/MPa 20 302.7 0.00083 302.7 150 234.9 0.104 357.5 250 210.9 0.417 368.3 350 184.2 9.83 430.5 
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表 2 弹性跌落试验工况
Table 2. Conditions of Elastic Drop Test
工况 台面加速度幅值/
(m·s−2)管道中部响应加速度幅值/
(m·s−2)1 282 287 2 464 504 3 698 830 4 962 1228
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表 3 弹塑性跌落试验工况
Table 3. Conditions of Elastic-plastic Drop Test
工况 跌落高度/mm 输入加速度/(m·s−2) 1 180 1235 2 210 1462 3 250 1740
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