摘要
超声冲击处理(UIT)作为一种有效的焊后改善焊接接头疲劳性能的工艺措施,近年来在国内外船舶行业受到了广泛关注。为评价UIT技术对焊接接头疲劳强度的影响,提出一套新的数值分析方法,包括焊接数值模拟、超声冲击处理过程的弹塑性动态有限元分析,以及基于断裂力学的疲劳强度评估。在有限元模型中考虑了实际的工艺参数和超声促成的材料软化效应。以非承载十字焊接接头为研究对象,将预测的超声冲击处理前后的残余应力分布及疲劳强度与实验结果进行对比,两者吻合较好。
Ultrasonic Impact Treatment(UIT)has recently attracted considerable attention in the ship in?dustry as an effective post-welding improvement method for welded joints. In order to evaluate the effect ofUIT on the fatigue properties of welded joints,we propose a novel numerical analysis approach includingwelding simulation,dynamic elastic-plastic Finite Element Analysis(FEA)of the UIT process,and theevaluation of the fatigue strength of welded joints based on fracture mechanics. In the FEA model,the actu?al process parameters and ultrasonic-induced material softening,appropriately adjusted to fit the experi?mental results, are considered. The predicted residual stress distributions and fatigue strength ofnon-load-carrying cruciform joints before and after UIT are compared with the experimental results,andshow a fairly high level of agreement.
作者
袁奎霖
洪明
YUAN Kuilin;HONG Ming(School of Naval Architecture Engineering,Faculty of Vehicle Engineering and Mechanics,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian 116024,China)
出处
《中国舰船研究》
CSCD
北大核心
2016年第5期91-99,共9页
Chinese Journal of Ship Research
基金
中央高校基本科研业务费专项资金资助项目(DUT16RC(3)018)
关键词
超声冲击处理
残余应力
有限元分析
超声波促成软化效应
断裂力学
疲劳强度
Ultrasonic Impact Treatment(UIT)
residual stress
Finite Element Analysis(FEA)
ultrasonic-induced softening effect
fracture mechanics
fatigue strength