Institute of Space and Aeronautical Science, University of Tokyo
Institute of Space and Aeronautical Science, University of Tokyo
Institute of Space and Aeronautical Science, University of Tokyo
Institute of Space and Aeronautical Science, University of Tokyo
The dynamic source model of Acoustic Emission based upon the concept of the stress concentration is established and applied to the problem about the grain size dependence of AE activities. Numerical results of the present source model suggests that the relation between AE activities and the grain diameter strongly depends upon the measured frequency. AE activities have a maximum at an appropriate grain size. At higher frequencies, AE activities show a maximum at smaller grain sizes. It depends upon the resonant condition between the measured frequency and the relaxation time of the motion of dislocations. The present numerical prediction is verified by the experiment about the grain size dependence of AE activities in poly'crystals of pure aluminum.
<論文>局所的な応力集中の解放に伴うAEの発生モデル
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