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利用电子拉伸试验设备和弱磁场测量系统,对受静拉伸载荷的试样表面漏磁场进行测量,研究了试件在弹性阶段、均匀变形阶段和非均匀变形阶段磁记忆信号随载荷大小不同的变化规律;最后,根据试验现象,结合晶粒滑移理论基础对静载荷下磁记忆检测的机理作了解释。试验和理论研究的结果表明:采用磁记忆方法对承载疲劳载荷铁磁构件由应力集中造成的早期损伤进行检测是可行的。
Using the electronic tensile test equipment and weak magnetic field measurement system, the leakage magnetic field of the sample under the static tensile load was measured. The magnetic memory signals with different loads in the elastic phase, the uniform deformation phase and the non-uniform deformation phase were studied. Finally, according to the test phenomenon and the theory of grain slip, the mechanism of magnetic memory testing under static load is explained. The experimental and theoretical studies show that it is feasible to detect early damage caused by stress concentration in ferromagnetic components bearing fatigue load by using magnetic memory method.