静拉伸条件下螺纹联接件三维弱磁信号研究

针对螺纹联接件应力分布不均匀和局部塑性变形问题,提出了利用地磁场环境下试件表面三维弱磁信号进行检测的新方法.在静拉伸试验机上对螺纹联接件进行了拉伸实验,利用二维磁记忆检测传感器实现了螺纹法向、轴向和切向三维弱磁信号的在位测量.利用有限元方法对螺纹的法向、轴向和切向应力应变进行了计算.结果表明,三维弱磁信号中,轴向弱磁信号和应力之间具有较好的相关性.

Study into Three-Dimensional Weak Magnetic Signal of Bolted Connection Under Static Tension Condition

To study the non-uniform stress and plastic deformation in threads of a bolted connection,a new method was proposed to detect three-dimensional weak magnetic signals under static tension loads within geomagnetic field.The triangular thread with a special hatch on the nut was used for static tension testing,and a two-dimensional magnetic memory detecting transducer was used to get weak magnetic signals of all the three dimensions on site.Then,the stress and strain of the thread was calculated using finite-el...