Abstract
In studying spallation strength of various metals, free surface velocity profiles are mostly registered using the interferometry methods working in the visible and near infrared wavelength range. Use of such methods involves proper preparation of the surface of the studied specimen, thus making especially interesting interferometers working in the millimeter-range radio-waves. The article describes the functioning principle of the interferometer used for registering displacement and for determining free surface velocity of the specimen in plane-wave experiments. The efficiency of the methodology is tested, using experiments on impact loading of specimens of the D16T aluminum alloy. The interferometer was used for determining free surface velocity of the specimen when a loading wave reaches the free surface. Then, based on the free surface velocity, spallation strength of the material under study was determined. The obtained results are in good agreement with the results published by other authors and obtained using different methods. The present methodology is applicable for studying spallation strength in plane-wave experiments. Keywords: radio-interferometer, plane-wave experiment, spallation strength, registration of displacement, free surface velocity of the specimen.
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