熔盐罐罐底角焊缝疲劳可靠性评估方法及应用

俞兵; 胡海军; 谢国山; 李涌泉; 李秀峰

doi:10.7652/xjtuxb202501020

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熔盐罐罐底角焊缝疲劳可靠性评估方法及应用

更新时间：2026-01-06

- 熔盐罐罐底角焊缝疲劳可靠性评估方法及应用
- Methodology and Application of Fatigue Reliability Assessment Fillet Welds at the Bottom of Molten Salt Tanks
- 西安交通大学学报 2025年59卷第1期页码：215-224
- 作者机构：
  
  1.西安交通大学化学工程与技术学院， 710049，西安
  2.中国特种设备检测研究院， 100029，北京
  3.国家市场监督管理总局技术创新中心（炼油与化工装备风险防控）， 100029，北京
- 作者简介：
  
  俞兵（1998—），男，硕士生；
  李秀峰（通信作者），男，高级工程师。
- 基金信息：
  
  国家市场监督管理总局科技计划项目(2022MK200);中国特检院内部项目(2022key03)
- DOI：10.7652/xjtuxb202501020
  中图分类号： TK513.5
- 收稿：2024-06-05，
  
  网络首发：2024-09-19，
  
  纸质出版：2025-01-10
- 稿件说明：
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俞兵, 胡海军, 谢国山, 等. 熔盐罐罐底角焊缝疲劳可靠性评估方法及应用[J]. 西安交通大学学报, 2025,59(1):215-224.

YU Bing, HU Haijun, XIE Guoshan, et al. Methodology and Application of Fatigue Reliability Assessment Fillet Welds at the Bottom of Molten Salt Tanks[J]. Journal of Xi’an Jiaotong University, 2025, 59(1): 215-224.
俞兵, 胡海军, 谢国山, 等. 熔盐罐罐底角焊缝疲劳可靠性评估方法及应用[J]. 西安交通大学学报, 2025,59(1):215-224. DOI： 10.7652/xjtuxb202501020.

YU Bing, HU Haijun, XIE Guoshan, et al. Methodology and Application of Fatigue Reliability Assessment Fillet Welds at the Bottom of Molten Salt Tanks[J]. Journal of Xi’an Jiaotong University, 2025, 59(1): 215-224. DOI： 10.7652/xjtuxb202501020.

摘要

为了准确评估熔盐罐罐底角焊缝服役过程中的疲劳可靠性，将应力影响因素和疲劳模型参数随机化，提出了一种基于应力-强度干涉理论的角焊缝疲劳可靠性评估方法。通过雨流计数法获得典型的熔盐液位变化幅值并统计其出现频率；建立了真实尺寸的角焊缝数值模型并获得其应力分布；基于角焊缝尺寸、载荷等应力影响因素的正态分布模型，应用拉丁超立方抽样方法对其抽样统计，从而获得角焊缝焊趾处等效结构应力的分布模型；对ASME BPVC.Ⅷ.2—2023标准中疲劳寿命模型的主应力-寿命曲线参数进行随机化，基于应力-强度干涉理论，建立了角焊缝疲劳可靠性评估模型；对某光热装置低温熔盐罐罐底角焊缝的疲劳可靠性进行实例分析。结果表明：一个季度内熔盐罐液位变化主要有6种典型工况，最大液位波动为1.55~12.39 m；角焊缝最大应力位于其内侧焊趾处，为301.5 MPa；多载荷下角焊缝的疲劳寿命均值为46 a，服役3 a后角焊缝的疲劳失效概率为0.040 6，服役30 a后的失效概率为0.335 9。

Abstract

To accurately assess the fatigue reliability of fillet welds at the bottom of molten salt tanks during service

a fatigue reliability assessment method based on the stress-strength interference theory is introduced. This method involves randomizing stress-influencing factors and fatigue model parameters. The range of typical molten salt liquid level variations and their occurrence frequencies are obtained through the rainflow counting method. A numerical model of fillet welds

accurately representing their dimensions

is created to analyze stress distribution. By utilizing a normal distribution model for stress-influencing factors such as fillet weld size and load

the Latin hypercube sampling technique enables the statistical sampling necessary to establish the distribution model of equivalent structural stress at the fillet weld toe. The primary stress-life curve parameters within the fatigue life model as per the ASME BPVC.Ⅷ.2—2023 standard is randomized. Based on the stress-strength interference theory

a fatigue reliability assessment model for fillet welds is established. An illustrative analysis of the fatigue reliability of fillet welds at the bottom of a low-temperature molten salt tank of a solar thermal device reveals six typical operational scenarios for liquid level fluctuations within a quarter

with peak variations spanning from 1.55 m to 12.39 m. The highest stress on the fillet weld is identified at the inner weld toe

measuring 301.5 MPa. The average fatigue lifespan of fillet welds subjected to various loads is calculated at 46 a. Following 3 a of service

the probability of fatigue failure of the fillet weld stands at 0.040 6

escalating to 0.335 9 after 30 a of operational service.

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references

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