The influence of the shearing process on the iron loss of non-oriented electrical steel sheets with the grain size of 10-155 µm was investigated. The ratio of iron loss deterioration showed a strong correlation with grain size of the material, and the deterioration ratio was smaller as the decrease of grain size. The smaller grain size material had a shorter droop height in the sheared edge, and the ratio of iron loss deterioration also had a good correlation with the droop height in the sheared edge. The effective plastic strain near the sheared edge calculated by elastic-plastic analysis based on FEM showed smaller values with a small material grain size.
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