Abstract
For studying the influence of notch characteristics on magnetic memory signals, static tension tests on Q235 steel were carried out. The normal component of magnetic flux leakage, Hp(y), were measured by metal magnetic memory testing, and the relationship between the magnetic field values at a fixed point with stress under different loads were studied; carrying ANSYS simulation on double associated notch specimen, and studying the internal stress distribution of double associated notch specimen and the relationship between the magnetic field value at a fixed point with stress; comparing the experimental results with simulation results and found that test results is consistent with the simulation results. The results show that semicircular notch is more potential danger than V-shaped notch specimen; magnetic field values at the center of notch of the double associated notch specimen is approximately superimposed on single notch specimen magnetic field values in corresponding position. The normal component of magnetic flux leakage Hp(y) and gradient value k(y) in stress concentration of double associated notch specimen are no longer applicable of evaluating stress concentration degree of double associated notch.
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