摘要
针对实际工程中角焊缝在设备结构中位置特殊、造成采用常规无损检测无法对其评价的难题,进行了角焊缝缺陷处磁记忆检测信号定量特征提取与建模。从三维地磁场下力磁耦合的角度,考虑焊接残余应力的基础上,对不同倾斜角度相交的管道角焊缝进行力磁耦合仿真,获得不同载荷下不同角度的角焊缝磁场分布规律,提取缺陷处切向和法向磁记忆特征参数,建立不同载荷下角焊缝缺陷处应力集中程度的定量表征模型。进一步考虑到理论建模与实际检测的差异性,设计磁记忆检测试验,用实测数据对模型进行修正,并对修正模型进行了验证,验证结果表明最大误差7.117%,为工程实际中对角焊缝这类复杂焊接结构的磁记忆定量检测提供科学依据。
Due to the special position of fillet weld in the special position of equipment structure,there exists the bottleneck of fillet weld evaluation by using traditional nondestructive testing methods. In order to the bottleneck,a new quantitative model is presented based on feature parameter extraction of metal magnetic memory（MMM） signals. By considering the welding residual stress,the intersecting pipe fillet welds with different inclined angles are simulated by the magneto-mechanical coupling under the three-dimensional geomagnetic field. The changing rule of MMM tangential and normal signals is obtained,and then the MMM feature parameters are extracted for fillet welds under different loads. The quantitative characterization model for the stress concentration degree of fillet weld under different loads is established. Further,considering the difference between finite element simulation and actual MMM testing,the practical experiments are carried out in order modify the quantitative characterization model. The result shows the maximum error of the modified model is 7. 117%,which provides the scientific basis for quantitative MMM testing for fillet weld defects in practical engineering.
出处
《压力容器》
2016年第12期49-58,共10页
Pressure Vessel Technology
基金
国家自然科学基金项目(11272084
11472076
11072056)
黑龙江省博士后科研启动基金项目(LBH-Q13035)
中石油科技创新基金项目(2015D-5006-0602)
东北石油大学研究生创新科研项目资助项目(YJSCX2016-024NEPU)
关键词
角焊缝
有限元仿真
力磁耦合
定量研究
磁记忆检测
weld
finite element simulation
magneto-mechanical coupling
quantitative analysis
metal magnetic memory testing
