| 钢结构磁性无损检测理论与应用研究 |
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| 引用本文： | 王社良,;熊二刚.钢结构磁性无损检测理论与应用研究[J].中国科技论文在线,2008(7):492-496. |
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| 作者姓名： | 王社良 ;熊二刚 |
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| 作者单位： | [1]西安建筑科技大学土木工程学院,西安710055; [2]长安大学建筑工程学院,西安710061 |
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| 基金项目： | 国家自然科学基金重大研究计划资助项目（90715003）; 高等学校博士学科点专项科研基金资助项目（20050703004）; 陕西省自然科学基金（2007E205）; 陕西省教育厅专项科研基金资助项目（05JK244） |
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| 摘 要： | 当钢材等铁磁材料受到外部荷载作用时,在它的内部将产生内力,即产生应力σ,从而使铁磁材料磁化时的磁导率发生相应变化。本文根据铁磁材料的这一独特性能,针对大跨钢结构等缺陷敏感结构的主要受力和变形特点,利用磁化的应力敏感性,研究并提出了一种铁磁构件在简单应力状态下的磁导率变化与其应力变化关系的数学模型,得出了构件应力与其磁导率之间的线性相关关系,建立了大跨钢结构等缺陷敏感结构安全状况磁性无损检测的基本理论和工程应用方法,为保证这类结构的安全性提供了一定的依据。
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| 关 键 词： | 土木建筑结构 破坏与事故分析 磁性无损检测 钢结构 铁磁材料 磁导率 应力 |
A theoretical research on magnetic nondestructive testing of steel structures |
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| Institution: | WANG Sheliang,XIONG Ergang (1. School of Civil Engineering, Xi-an University of Architecture and Technology, Xi-an 710055; 2. College of Civil Engineering, Chang’an University, Xi-an 710061) |
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| Abstract: | When the ferromagnetic material is subjected to the mechanical stresses, it experiences strain and causes stressesσ , subsequently leading to the variation in the magnetic permeability of this material magnetized. In the light of the main stressed characteristics for a long-span steel structure and the stress dependent magnetization, a mathematical model for the variation of the magnetic permeability and stress of the ferromagnetic components under the action of simple stresses is presented, and a linear dependency relation between the the variation of the magnetic permeability and stress is obtained and then verified through the comparison of theory and experiment. The magnetic nondestructive testing technique can be applied to assurance of long-span steel structures problems. |
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| Keywords: | civil and building structure analysis of failure and accident steel structure magnetic nondestructive testing ferromagnetic materials magnetic permeability stress |
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