WEAK MAGNETIC SIGNAL CHANGES OF L80 CASING IN TENSION

摘要：

Weak magnetic signal changes of casing L80 under tensile stress in geomagnetic field environment are studied to assess stress status of the casing. The normal components of weak magnetic signals on the casing surface were recorded throughout the loading and unloading processes on a whole pipe testing machine. Effects of the initial magnetization on the trend and variable ratio of magnetic signals are analyzed. The relation between normal magnetic signals and applied tensile stress are studied. During the elastic process, approximate linearity between normal magnetic signals and tensile stress is presented; the variation of the magnetic signals grows intense after entering the plastic process, which is useful to identify whether the specimen under stress is in elastic deformation process or plastic deformation process.

关键词： week magnetic signal tensile stress demagnetizing field

作者: Zuo Weidong Fan Jianchun Wang Yumei Li Mingzhao

作者单位: China University of Petroleum,Beijing Beijing,China China University of Petroleum,Beijng Beijing,China

会议类型: 国际会议

会议名称: The 3rd World Conference on Safety of Oil and Gas Industry(第三届世界石油天然气工业安全会议 WCOGI 2010)

会议地点: 北京

会议语种:英文

页码: 544-547

在线出版日期: 2010-09-27（万方平台首次上网日期，不代表论文的发表时间）