Abstract
The large and small difficulties during the trial, a lot of places repeated the experiment many times, in order to avoid has omission cause the whole experimental process experiments to be carried out again. The experimental project has a large amount of data, so it is a test of the patience of team members in data processing. When the researchers process the data, you need to import the origin of many data, to draw out the change of the magnetic field intensity and the magnetic field gradient image, and the process we have a good command of origin usage skills, understand how vital it is to process data correctly at the same time, care and patience for scientific research employees are essential. This issue necessitates a greater understanding of mathematics, physics, and chemistry, which is made more difficult by the fact that the process of understanding the principle necessitates the use of these skills. The test results show that there is a good corresponding relationship between the magnetic induction intensity and the stress state of the steel bar. The normal residual magnetic induction intensity and the hysteresis loop area of the steel bar under the action of fatigue load show the three-stage change law of fatigue, which can be further applied to the steel bar. The state of stress is being tested.
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