電磁誘導法による応力パルスの発生および三層帯板の衝撃応答への応用

概要

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Several experiments concerning the generation and propagation of a single stress pulse have been made for the purpose of investigating shock response of a multilayer strip plate. The generator of reproducible single shock pulse was developed using the electro-magnetic induction method. The stress amplitude and the pulse width were easily controlled. The stress pulse was observed by the dynamic photo-elasticity method. Measurements of reflection and transmission of stress pulse in a three-layer strip plate were made as a simple example to test shock response. Photo-elastic materials were used as an incident and a transmitting media and metals were used as an intermediate layer. Observations were made at intervals of 10 μsec, and the reflection and transmission phenomena were found to depend on the relative characteristic impedance of the intermediate layer with respect to the incident medium as well as on the relative width of the intermediate layer with respect to the incident pulse. Moreover, a simple analysis was made based on the theory of reflection and transmission of plane waves at a boundary in infinite medium. For more detail discussion, it is necessary to analyze the data with consideration for frequency components of incident, reflected and transmitted pulses.
1984-04-15