承载超声冲击下焊接接头疲劳性能的改善
Improvement of loading ultrasonic peening on fatigue strength of welded joints under high stress ratio
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摘要: 采用承载超声冲击处理的方法对20号钢T形管接头进行处理，并与原始焊态、非承载冲击处理态试件进行了对比.结果表明,在高应力比R=0.75的加载条件下，与原始焊态接头相比，非承载超声冲击和承载超声冲击的疲劳强度分别提高了23%和70%，疲劳寿命分别延长了1.4倍和5.6～8.5倍.从超声冲击处理区域表层组织、接头焊趾区表层硬度、焊接接头残余应力等方面比较了承载和非承载超声冲击提高焊接接头疲劳性能的异同，并采用有限元软件ABAQUS模拟了两种超声冲击处理下焊接接头的应力分布，与非承载冲击处理试件相比，承载冲击处理试件表面压缩应力值大，压缩应力层深.Abstract: Tubular Tjoints made by 20 steel were treated by loading ultrasonic peening. The test results were compared with aswelded joints and joints treated by unloading ultrasonic peening. The testing results show that, under the loading condition of high stress ratio R=0.75, the fatigue strength was increased by 23%, and the fatigue life was prolonged by 1.4 times after treated by unloading ultrasonic peening. After loading ultrasonic peening, the fatigue strength was increased by 70%, and the fatigue life was prolonged by 5.6~8.5 times. The difference for the fatigue performance was expounded from the microstructure on the surface, the hardness in the welded toe and the residual stress in the welded joints. The ABAQUS finite element analysis software was used to simulate the residual stress in the welded joints treated by loading ultrasonic peening and unloading ultrasonic peening. The results show that compared to joints treated by unloading ultrasonic peening, the surface compressive stress value and the stress depth for joints treated by loading ultrasonic peening were higher.
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Keywords:
- welded joint /
- fatigue performance /
- loading ultrasonic peening
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