摘要
金属磁记忆检测作为一种新型无损检测方式，在热残余应力检测方面有良好的应用潜质。以传热学、电磁学、热弹塑性有限元分析法及力-磁效应为理论基础，采用ANSYS分析软件建立“热-力-磁”耦合模型，利用该耦合模型得到熔覆层附近基体材料的热残余应力分布以及其相应磁信号。结果表明热残余应力与其磁信号都主要集中在温度梯度变化较大的熔覆层附近，距离熔覆层越近数值越大，并且磁信号的方向随应力性质变化。此外增大热源输入会增大磁信号的数值但并不影响其分布规律。仿真结果符合热残余应力形成机理以及力-磁效应原理。通过相同工艺参数下的试验验证，发现仿真磁信号与实测磁信号的变化规律基本相同，证明上述分析与实际情况基本吻合。研究结果为磁记忆技术在热残余应力检测的深入研究提供了借鉴意义与参考价值。
As a new type of non-destructive testing, metal magnetic memory detection has a good potential in thermal residual stress detection. Based on the theory of heat transfer, electromagnetism, thermo-elastic-plastic finite element analysis and force-magnetic effect, ANSYS analysis software is used to establish the ＂ heat-force-magnet＂ coupling model. The simulation results show that the matrix material thermal residual stress distribution and its corresponding magnetic signal. The results show that the thermal residual stress and its magnetic signals are mainly concentrated in the vicinity of the cladding layer with large temperature gradient change. The closer the distance is, the larger the value. And the direction of the magnetic signal changes with the stress property. The value of the magnetic signal increases as the heat source input increases but it does not affect distribution the magnetic signal. The simulation results are consistent with the thermal residual stress formation mechanism and the force-magnetic effect principle. The test was carried out under the same process parameters, it is found that the variation of the simulated magnetic signal and the measured magnetic signal is the same. which proves that the above analysis is consistent with the actual situation. The results provide a reference for the magnetic memory technology in the thermal residual stress detection in-depth study.
出处
《机械设计与研究》
CSCD
北大核心
2018年第1期50-54,59,共6页
Machine Design And Research
关键词
有限元法
等离子喷焊
热-力-磁耦合模型
残余应力
磁信号
finite element method
plasma spray welding
thermal-force-magnetic coupling model
residualstress
magnetic signal
