航天推进技术研究院主办
[1]周 帅,林 磊,杜大华,等.液体火箭发动机对接焊管道振动疲劳性能研究[J].火箭推进,2021,47(03):90-97.
ZHOU Shuai,LIN Lei,DU Dahua,et al.Study on vibration fatigue of butt welded pipe of liquid rocket engine[J].Journal of Rocket Propulsion,2021,47(03):90-97.
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ZHOU Shuai,LIN Lei,DU Dahua,et al.Study on vibration fatigue of butt welded pipe of liquid rocket engine[J].Journal of Rocket Propulsion,2021,47(03):90-97.
液体火箭发动机对接焊管道振动疲劳性能研究
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
47
期数:
2021年03期
页码:
90-97
栏目:
工艺与材料
出版日期:
2021-06-30
- Title:
- Study on vibration fatigue of butt welded pipe of liquid rocket engine
- 文章编号:
- 1672-9374(2021)03-0090-08
- Keywords:
- pipe; butt weld; vibration fatigue; crack growth
- 分类号:
- V434.23
- 文献标志码:
- A
- 摘要:
- 振动引起的管道疲劳失效是液体火箭发动机主要故障模式之一,研究小尺寸管道焊缝的振动疲劳性能具有重要意义。通过振动疲劳试验,获得了不同应力幅下1Cr18Ni9Ti不锈钢管道对接焊缝的振动疲劳寿命。随着应力幅的降低,振动疲劳寿命分散性呈增大趋势。基于成组法和升降法获取了焊接管件的中值S-N曲线和设计S-N曲线,低应力下焊接管件疲劳寿命高于ASME标准给出的允许疲劳寿命。研究了薄壁管道振动疲劳裂纹萌生与扩展特征,疲劳裂纹均在对接焊缝外壁焊趾萌生,裂纹扩展寿命在总疲劳寿命中所占比重较小。焊接管件振动疲劳S-N曲线为液体火箭发动机管路动强度设计提供了数据基础。
- Abstract:
- Fatigue failure of pipelines caused by vibration is one of the main failure modes of liquid rocket engine.It is of great significance to study the vibration fatigue performance of pipe welds.The vibration fatigue lives of butt welded stainless steel(1Cr18Ni9Ti)pipes at different alternating stress amplitudes were studied by vibration fatigue testing.The dispersion of vibration fatigue lives increases with the decrease of the alternating stress amplitudes.The median vibration fatigue S-N curve and the design vibration fatigue S-N curve of the butt welded pipe were obtained based on the group method and the up-to-down method,which gives longer life than the ASME data at low stress amplitude.The characteristics of the fatigue crack initiation and propagation were studied.It was found that the fatigue cracks are all initiated at the weld toe of the outer walls.The crack growth life is only a small percentage of the total fatigue life.The vibration fatigue S-N curve of welded pipe provides data basis for the dynamic strength design of the liquid rocket engine pipelines.
参考文献/References:
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备注/Memo
收稿日期：2020-11-04; 修回日期:2020-11-26
基金项目：国家自然科学基金(52005385); 国防科技重点实验室稳定支持项目(HTKJ2019KL011004)
作者简介：周帅(1990—),男,硕士,研究领域为振动力学、疲劳断裂。
更新日期/Last Update:
1900-01-01