基于矫顽力的管道剩磁应力检测技术研究

Research on Detection Stress Technology of Residual Magnetic Based on Coercive Force

田野 罗宁 刘剑 张贺 赵康 李坤

Ye Tian Ning Luo Jian Liu He Zhang Kang Zhao Kun Li

国家管网集团西部管道有限责任公司，新疆 乌鲁木齐 830000 沈阳工业大学 信息科学与工程学院，辽宁 沈阳 110870

West Pipeline Company of PipeChina，Urumqi Xinjiang 830000，China School of Information Science and Engineering，Shenyang University of Technology，Shenyang Liaoning 110870，China

剩磁应力检测技术可对铁磁性材料的应力集中程度进行有效检测，在长输油气管道内检测领域具有巨大发展潜力。然而，剩磁应力检测技术的机理尚不完善，剩磁信号与应力关系难以量化计算，导致剩磁应力检测无法实现管道损伤的量化测量，严重影响了该技术在管道内检测领域的应用。根据磁畴模型解释了管道剩磁产生机理，通过矫顽力建立剩磁与应力的对应关系,分析了剩磁信号随管道外应力的变化特征。研究结果表明，铁磁性材料的不可逆磁化是产生剩磁的原因，随着管道外应力的增加剩磁信号有逐渐增大的变化规律。

The residual magnetic stress detection technology can effectively detect the stress concentration of ferromagnetic materials, and has great potential in the field of long?distance oil and gas pipeline stress detection. However, due to the imperfect mechanism of the residual magnetic stress detection technology, the relationship between the residual magnetic signal and the stress is difficult to calculate quantitatively, resulting in the quantitative measurement of the residual magnetic stress detection, which seriously affects the application of the technology in the field of pipeline detection. In this paper, the mechanism of remanence generation is explained based on the magnetic domain model. Correspondence between remanence and stress is established by coercive force. The changing characteristics of remanence signal with the change of stress are analyzed and verified by experiments. The research results show that the irreversible magnetization of ferromagnetic materials is the cause of residual magnetism; as the external stress increases, the residual magnetism signal has a gradually increasing change rule.

辽宁省自然科学基金面上项目(2019?MS?243)

10.3969/j.issn.1672-6952.2021.04.014