径向间隙对304L不锈钢振动疲劳性能的影响

发布时间：2018-02-03 11:29

本文关键词： 插套焊振动疲劳径向间隙　出处：《焊接学报》2017年08期 　论文类型：期刊论文

【摘要】：基于疲劳试验和有限元分析,研究径向间隙对插套焊疲劳性能的影响.疲劳试验表明,应力比较大时,试样易在焊趾处失效,焊趾处裂纹由外向内扩展;应力比较小时,易在焊根处失效,焊根处裂纹由内向外扩展.未失效试样径向间隙高于失效试样.利用有限元软件建立了插套焊有限元模型,分析了径向间隙对焊根和焊点处疲劳性能的影响.结果表明,相对于0.1 mm的径向间隙,0.4 mm径向间隙能降低焊根和焊趾处的应力,降低幅度分别为14%和1.4%,径向间隙越大,焊根和焊趾处的应力峰值越小,疲劳性能越好.
[Abstract]:Fatigue test and finite element analysis based on the influence of radial clearance on the socket weld fatigue performance. The fatigue test shows that the stress is relatively large, easy to sample at the weld toe failure, weld toe crack propagation from the outside to the inside; the stress is small, easy to failure in root, root of weld crack from the inside out. Failure sample radial clearance than failure specimens. Finite element software was used to establish the sleeve welding finite element model, analyzes the influence of fatigue performance of radial gap welding root and solder joints. The results showed that compared with the radial clearance of 0.1 mm, 0.4 mm radial clearance can reduce the stress of the weld root and the weld toe the lower rates are 14% and 1.4%, the radial clearance increases, the weld root and the weld toe of the peak stress is smaller, fatigue performance will be better.

【作者单位】：烟台大学环境与材料工程学院;
【基金】：山东省自然科学基金资助项目(ZR2016EEP14)
【分类号】：TG406
【正文快照】： 0序言小支管插套焊经常用在核电站中,研究发现在腐蚀、振动和热流等条件下易出现泄露事故导致核电站停运,造成巨大的经济损失和环境危害[1-2].导致插套焊支管失效的主要机制有应力腐蚀、腐蚀、磨蚀、结构设计缺陷、热疲劳和振动疲劳等.美国电科院(EPRI)历经20多年的调查收集了

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