1.广西防城港核电有限公司,防城港 538000
2.苏州热工研究院有限公司,苏州 215004
杨建东,男,1986年生,云南施甸人,高级工程师;主要研究方向为核电厂机械设备振动状态监测和故障分析诊断;E-mail:yangjiandong@ cgnpc.com.cn。
收稿:2024-08-15,
修回:2024-10-09,
纸质出版:2026-06-15
移动端阅览
杨建东,高红波,徐洋洋,等. 核电厂小支管焊接接头随机振动疲劳评价方法研究[J]. 机械强度,2026,48(6):110-116.
YANG Jiandong,GAO Hongbo,XU Yangyang,et al. Study on random vibration fatigue evaluation method of small branch pipe welded joints in nuclear power plants[J]. Journal of Mechanical Strength,2026,48(6):110-116.
杨建东,高红波,徐洋洋,等. 核电厂小支管焊接接头随机振动疲劳评价方法研究[J]. 机械强度,2026,48(6):110-116. DOI: 10.16579/j.issn.1001.9669.2026.06.012.
YANG Jiandong,GAO Hongbo,XU Yangyang,et al. Study on random vibration fatigue evaluation method of small branch pipe welded joints in nuclear power plants[J]. Journal of Mechanical Strength,2026,48(6):110-116. DOI: 10.16579/j.issn.1001.9669.2026.06.012.
目的
2
针对核电厂小支管焊接接头在随机振动载荷下的疲劳寿命评估问题,探讨了基于测试数据、在役适用性评估(Fitness-For-Service
ASME FFS-1
)
方法和等效结构应力法的疲劳寿命评估方法。
方法
2
对比了基于测试数据、ASME FFS-1疲劳分析方法和等效结构应力法的疲劳寿命评估方法,并通过随机振动疲劳试验进行对比验证。
结果
2
研究结果表明,ASME FFS-1疲劳分析方法在处理复杂结构时易受网格敏感性影响,可能导致疲劳寿命评估结果的保守性偏高;基于测试应力的疲劳分析方法同样表现出较高的保守性,可能增加不必要的维护成本;相比之下,等效结构应力法能够更准确地考虑焊接接头的局部应力集中效应,并能有效应对复杂的随机振动环境,在疲劳寿命预测中表现出更高的准确性和工程适用性。研究可为制定有效的预防性维护策略提供重要参考。
Objective
2
Aiming at the fatigue life evaluation of welded joints of small-bore pipes in nuclear power plants under random vibration loads
fatigue life evaluation methods based on test data
the in-service fitness-for-service (FFS) assessment method specified in ASME FFS-1 and the equivalent structural stress method were investigated.
Methods
2
The fatigue life evaluation approaches based on test data
ASME FFS-1 fatigue analysis method and equivalent structural stress method were compared
and comparative verification was conducted via random vibration fatigue tests.
Results
2
The research results reveal that the ASME FFS-1 fatigue analysis method is susceptible to mesh sensitivity when dealing with complex structures
which may lead to excessively conservative fatigue life evaluation results. The fatigue analysis method based on measured stress also presents high conservatism and may cause unnecessary increase in maintenance costs. In contrast
the equivalent structural stress method can more accurately take into account the local stress concentration effect of welded joints
effectively adapt to complex random vibration environments
and possesses higher prediction accuracy and engineering applicability in fatigue life prediction. It can provide an important reference for formulating effective preventive maintenance strategies.
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