摘要
油气管道是国家重要的能源基础设施,管道的受力状态是影响管道安全运行的重要因素.对管道应力的有效检测可以预知管道破坏的风险.以铁磁性材料微观磁学理论为基础,建立应力与材料剩磁场之间的数学模型,分析了剩磁与应力之间的对应关系,对不同应力作用下铁磁性材料的剩磁效应进行了解析.通过有限元软件对应力与剩磁之间的关系进行了仿真分析.结果表明,应力与剩磁信号之间具有线性对应关系,铁磁性材料的磁滞回线随应力增大而偏移,在较低应力范围内,剩余磁场强度随应力增大而增大,之后随应力增大呈线性下降趋势,剩磁随应力的变化趋势存在一个反转点.通过对管道材料进行受力拉伸试验,验证了理论分析的正确性.
Abstract
Oil and gas pipeline is an important energy infrastructure in the country.The stress state of pipeline is an important factor affecting the operation safety of the pipeline.Effective detection of the stress can predict the risk of pipeline damage.Based on the microscopic magnetism theory of ferromagnetic materials,a mathematical model between the stress and the remaining magnetic field of the material is established.The correspondence between the residual magnetic field and the stress is analyzed.The remaining magnetic effect of ferromagnetic materials under different stresses is analyzed.The relationship between stress and magnetization is simulated by finite element software.The results show that there is a linear correspondence between the stress and the residual magnetic signal.The hysteresis loop of ferromagnetic materials shifts with the increase of the stress.In the lower stress range,the residual magnetic field strength increases with the increase of the stress,and then shows a linear decline trend with the increase of the stress.There is a reversal point in the change trend of the remaining magnetic force with the stress.The correctness of the theoretical analysis is verified by conducting the tensile test of the pipeline material.
维普
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