Abstract
A method for nondestructively measuring mechanical stresses in ferromagnetic steels was explored by applying a sinusoidal magnetic field to the materials and analysing the harmonic content of the resulting voltage induced in a sensing coil. The uniaxial stress dependence of the third harmonic amplitude was investigated along with the feasibility of separating stress effects from the effects of variations in material properties such as hardness, grain size and tempering temperature. The results obtained from SAE 4340 steel and AISI 410 stainless steel with various grain sizes, hardnesses and yield strengths showed that it is feasible to reduce the effects of material property variations by using the anisotropy in the harmonic amplitude as a stress indicator and thus to measure stresses in components made of ferromagnetic steels.
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