Study on Experiment of D-N Fatigue Curve of Fillet Weld Joint of Pipe Seat
-
摘要: 锅炉大直径厚壁管与小径管的管座角焊缝焊接接头常常因受疲劳作用而发生失效，这种疲劳导致的失效多数是由于小载荷、长力臂产生的弯曲应力反复作用造成的。基于锅炉承压部件管接头的特征及其服役背景，设计了模拟焊接接头试样，采用悬臂弯曲加载方式，通过成组试验方法，研究了锅炉管座角焊缝焊接接头的位移-寿命曲线（即D-N曲线）。结果表明：锅炉管座角焊缝焊接接头的D-N曲线可以用来对其进行疲劳有限寿命设计，D-N数据分布可以用幂函数规律进行表达。Abstract: The weld joint of large diameter thick wall tube and small diameter tube of boiler always fails in view of fatigue action, and this failure mostly hails from periodic bending stress by small load and long lever arm. In this paper, based on characteristics and service condition of the pipe joint of pressure parts of the boiler, the specimen was designed. By cantilever bend loading mode, displacement-life curve of the fillet weld joint of pipe seat for the boiler, namely D-N curve, were studied by group-method. The results manifested that D-N curve could be used for finite life design of the fillet weld joint of pipe seat for the boiler and D-N data distribution could be expressed by power function rule, which would provide reference for assessment of fatigue life of the fillet weld joint of pipe seat for the boiler.
-
Key words:
- pipe seat /
- fillet weld joint /
- displacement-life curve /
- experiment
-
[1] 陶玉梁,刘新星,程义.某电厂末再出口小集箱管接头焊缝裂纹原因分析[J].锅炉制造,2018(5):45-48. [2] 陈鑫,蔡文河,张坤,等.火电厂异种钢早期失效研究现状[J].焊接,2018(2):19-25. [3] 张胜跃,卿黎,张宇栋.基于雨流-灰色GM (1,1)模型的锅炉焊接头疲劳寿命预测[J].中国安全科学学报,2015,25(12):62-67. [4] 李显宇.锅炉钢材疲劳问题的分析探讨[J].区域供热,2007(2):22-26. [5] 林彦龙.三种ERW焊管母材及焊接接头疲劳性能研究[D].秦皇岛:燕山大学,2019. [6] 徐凯,潘小燕,白小芳,等.焊缝余高及去应力退火对X80钢管焊接接头疲劳性能的影响[J].焊管,2018,41(10):1-7. [7] 张力文,钟玉平.固溶处理对304H焊接接头高温蠕变疲劳性能的影响[J].压力容器,2019,36(3):13-18. [8] 李夕强,王学,杨超,等.预热和焊后热处理对T23钢接头力学性能的影响[J].中国电力,2016,49(2):1-5. [9] 唐少杰.浅析锅炉受压部件出现的疲劳裂纹[J].发电设备,2000(3):1-4. -
点击查看大图
计量
- 文章访问数: 137
- HTML全文浏览量: 74
- PDF下载量: 11
- 被引次数: 0
下载:
