Acoustic Emission Peak under Cyclic Deformation

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  • 繰り返し変形下のAcoustic Emission Peak
  • クリカエシ ヘンケイカ ノ Acoustic Emission Peak

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Acoustic emission behavior under cyclic deformation was studied with the use of pure aluminum. An acoustic emission peak accompanied by the Bauschinger effect was newly found, and we call this peak “Bauschinger peak”. The characteristic and mechanism of this peak were as follows: (1) This peak was observed with the appearance of irreversible reverse plastic strain, and the peak height decreased with increase in the number of cycles and took a constant at the saturation stress. (2) The peak height and the reverse plastic strain at which a maximum of the peak was attained increased with increase in the strain amplitude. (3) The peak height increased with increase in strain rate, but its strain rate dependence was not so simple as that of simple tensile deformation. This result shows that there exists an increment of acoustic emission signals due to the Bauschinger effect. (4) From the above results in addition to the observation of microstructure, it is very likely that this peak is strongly related with the dislocations easily mobile in cells during stress reversal, with the aid of internal stress, which may annihilate each other in this region.

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