超长寿命区间16Mn钢焊接接头疲劳性能
Fatigue properties of welded joints of 16Mn steel in super long life region
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摘要: 使用自行研制的TJU-HJ-I型超声疲劳试验系统装置进行了16Mn钢母材和焊接接头试件的超声疲劳性能试验,以探索其在超长疲劳寿命区间的疲劳行为。结果表明,无论母材还是焊接接头,其S-N曲线都是一条连续下降的曲线;在106~107循环周次范围内焊接接头不存在传统概念上的疲劳极限,载荷循环周次超过107甚至109以后,试件依然发生疲劳断裂。在超长寿命区间,焊接接头疲劳强度远低于母材的疲劳强度。使用现有疲劳极限数据去设计工作在超长寿命区间的焊接结构件是很危险的。Abstract: Ultrasonic fatigue properties experiments have been performed with base metal and welded joints of 16Mn steel using a home-made ultrasonic fatigue testing system.The objective was to investigate its fatigue behaviors of welded joints in super long life region.The cycling frequency is about 20 kHz and the load ratio is-1.The testing results show that the S-N curves of both base metal and welded joints are not horizontal in super long life region.The specimens still fail over 107, even 109 stress cycles and there is no fatigue limit between 106 and 109 cycles.The fatigue strength of welded joist is much less than that of base metal.It is dangerous to design the super long life welded structures by current fatigue data.It is necessary to carry out comprehensive research of welded joints in super long life region with different material and different joint style.
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Keywords:
- super long life /
- welded joints /
- fatigue properties /
- ultrasonic fatigue test
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期刊类型引用(3)
1. 张小强，云泽，蒋庆梅，龙迅，李岩，曹鹏昊. X80M管道全自动焊环焊缝热影响区冷却时间预测模型. 油气储运. 2025(04): 411-419 . 
百度学术
2. 武少杰，曲皇屹，程方杰. 基于变速GTAW焊接温度场解析模型的熔深预测研究. 天津大学学报(自然科学与工程技术版). 2024(01): 64-72 . 百度学术
3. 范文学. 有限元分析技术对焊接接头疲劳特性的影响. 焊接技术. 2024(12): 28-32+145 . 百度学术
其他类型引用(1)
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