动态载荷下奥氏体不锈钢管道LBB环向贯穿裂纹稳定性实验及理论分析方法研究

何风; 姚迪; 王新军; 李一磊; 白晓明; 熊夫睿

doi:10.13832/j.jnpe.2022.02.0133

动态载荷下奥氏体不锈钢管道LBB环向贯穿裂纹稳定性实验及理论分析方法研究

doi: 10.13832/j.jnpe.2022.02.0133

1.
中国核动力研究设计院核反应堆系统设计技术重点实验室，成都，610213
2.
中国核动力研究设计院反应堆工程研究所，成都，610213

详细信息

作者简介:
何风（1984—），男，高级工程师，硕士，主要从事反应堆结构力学工作，E-mail: hefeng_work@163.com

中图分类号: TL353⁺.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-20
- 录用日期: 2021-08-16
- 修回日期: 2021-08-05
- 刊出日期: 2022-04-02

Research on Test and Theoretical Analysis Methods on Stability of LBB Circumferential Through-Wall Crack in Austenitic Stainless Steel Pipe under Dynamic Load

1.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
Reactor Engineering Research Sub-institute, Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: 管道环向贯穿裂纹是否稳定是评判管道是否满足破前漏（LBB）设计准则的标准之一，为确保LBB技术安全可靠，对管道环向贯穿裂纹在动态载荷下的稳定性进行实验研究。采用水平冲击机对含环向贯穿裂纹的管道依次进行加载速度为1.22、2、3、4 m/s的高温不带运行压力的冲击实验，以获得各应变率下的实验极限载荷值，并与工程理论分析计算结果进行比较。分析表明：奥氏体不锈钢管道环向贯穿裂纹在动态载荷下的失效模式为塑性失稳；经实验验证，在工程中对承受动态载荷的奥氏体不锈钢管道进行LBB分析时，采用美国核管会标准审查大纲3.6.3破前漏评估程序（SRP 3.6.3）中的极限载荷理论分析方法具有较高的工程安全性，若同时选用准静态下的材料力学性能，则工程安全性更高。
- 奥氏体不锈钢管道 /
- 环向贯穿裂纹 /
- 裂纹稳定性 /
- 动态载荷 /
- 冲击实验 /
- 极限载荷
Abstract: Judging whether the circumferential through-wall crack of pipe is stable is one of the criteria to judge whether the pipe meets the Leak-Before-Break (LBB) design criteria. In order to ensure the safety and reliability of LBB technology, the stability of circumferential through-wall crack of pipe under dynamic load is studied and analyzed by experiment. The horizontal impact machine was used to carry out the impact test on the pipe with circumferential through-wall crack without operating pressure at high temperature with the loading speed of 1.22 m/s, 2 m/s, 3 m/s, 4 m/s in order to obtain the test limit load values at each strain rate, and then compared with the engineering theoretical analysis and calculation results. The results show that the failure mode of circumferential through-wall cracks in austenitic stainless steel pipe under dynamic load is plastic instability. Through the verification of the test, when LBB analysis is carried out for austenitic stainless steel pipe under dynamic load in the project, the theoretical analysis method of limit load in the standard review plan 3.6.3 leak-before-break evaluation procedures (SRP 3.6.3) of the NRC has high engineering safety. If the mechanical properties of materials under quasi-static state are adopted at the same time, the engineering safety is higher.
- Austenitic stainless steel pipe /
- Circumferential through-wall crack /
- Crack stability /
- Dynamic load /
- Impact test /
- Limit load

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图 1 水平冲击实验过程

Figure 1. Horizontal Impact Test

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图 2 1.22 m/s冲击后裂纹形貌

Figure 2. Crack Morphology after 1.22 m/s Impact

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图 3 1.22 m/s冲击下配重重心处加速度时程

Figure 3. Acceleration Time History of Counterweight Center of Gravity under 1.22 m/s Impact

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图 4 1.22 m/s冲击下裂纹尖端应变时程

Figure 4. Strain Time History at Crack Tip under 1.22 m/s Impact　　　　

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图 5 2、3 m/s冲击下配重重心处加速度时程

Figure 5. Acceleration Time History of Counterweight Center of Gravity under 2 m/s and 3 m/s Impact

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图 6 2、3 m/s冲击下裂纹尖端应变时程

Figure 6. Strain Time History at Crack Tip under 2 m/s and 3 m/s Impact

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图 7 4 m/s冲击后裂纹形貌

Figure 7. Crack Morphology after 4 m/s Impact

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图 8 4 m/s冲击下配重重心处加速度时程

Figure 8. Acceleration Time History of Counterweight Center of Gravity under 4 m/s Impact

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图 9 4 m/s冲击下裂纹尖端应变时程

Figure 9. Strain Time History at Crack Tip under 4 m/s Impact

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图 10 极限载荷理论分析方法示意图

P_b—由热膨胀、自重和地震引起的弯曲应力；t—壁厚；β—中性轴与平均半径的两交点和截面圆心组成的半角

Figure 10. Schematic Diagram of Limit Load Theoretical Analysis Method

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表 1 常温和高温下不同应变率下试验件材料性能

Table 1. Material Properties under Different Strain Rates at Room Temperature and High Temperature

应变率/s⁻¹	σ_y/MPa		σ_u/MPa
应变率/s⁻¹	20℃	350℃	20℃	350℃
0.001	249	160	552	317
0.100	323	182	549	323
0.300	382	195	551	378

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表 2 276℃下不同应变率下试验件材料性能及裂纹处极限弯矩理论计算结果

Table 2. Material Properties at 276℃ and Theoretical Calculation Results of Limit Bending Moment at Crack under Different Strain Rates

应变率/s⁻¹	σ_y/MPa	σ_u/MPa	σ_f/MPa	S_I/MPa	极限弯矩/(kN·m)
0.001	179.96	369.70	274.83	256.75	57.397
0.100	213.62	373.68	293.65	274.34	61.330
0.300	236.93	416.79	326.86	305.37	68.268

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表 3 裂纹处极限弯矩的理论计算结果与实验结果比较

Table 3. Comparison of Theoretical Calculation Results and Experimental Results of Limit Bending Moment at Crack

加载速度/ (m·s⁻¹)	实验结果		理论计算结果
加载速度/ (m·s⁻¹)	应变率/ s⁻¹	极限弯矩/ (kN·m)	应变率/ s⁻¹	极限弯矩/ (kN·m)
1.22	0.0506	≥146.099	0.1	61.330
2	0.0734	≥667.880	0.1	61.330
3	0.0252	≥731.555	0.1	61.330
4	0.2672	≥2725.290	0.3	68.268

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