螺纹连接承载过程的力--磁关系研究  

The Force-magnetic Relations in Thread Connecting Process

作　　者：张卫民[1] 袁俊杰[2] 王朝霞[1] 刘红光[1] 

机构地区：[1]北京理工大学,北京100081 [2]北方工业大学,北京100144

出　　处：《中国机械工程》2009年第1期34-37,共4页China Mechanical Engineering

摘　　要：研究了单轴拉伸载荷作用下螺纹连接试件表面弱磁信号的变化。运用有限元方法,对受拉伸载荷作用的螺纹连接件进行应力分布计算,并将结果与测得的磁信号分布进行对比,得到了应力集中和局部塑性变形与磁记忆信号变化的对应关系。总结了磁信号随应力变化的趋势与材料的弹塑性变形之间的关系,探讨了用磁记忆检测结果判别铁磁性构件中是否发生塑性变形的可能性。The weak magnetic signals on a stretched screw＇ thread connection were studied. A finite element method was adopted to calculate the stress distribution of the screw connection when loaded with uniaxial tensile stress, and the results were compared with the magnetic signals distributions of the screw. A conclusion that the reverse changes of magnetic signal attribute to the stress concentration zone and local plastic strain is obtained. The experimental criterion was proposed to determine the occurrence of plastic strain while stress increasing.

关 键 词：金属磁记忆 弱磁信号 应力集中 螺纹连接 

分 类 号：TH115.28[机械工程—机械设计及理论]