Tension of liquids by shock waves*

Experimental investigation of dynamic tension of liquids (water, ethyl alcohol, glycerol, hexane, hexadecane and pentadecane) under shock waves have been investigated. The method of spall strength measurements was applied and wave profiles were registered by laser interferometer VISAR. It was found that negative pressures in liquids were almost independent from the value of stain rate when the temperature was far from melting point. For example, for water at 20 $^{\circ}$C it is constant and equal to 50 MPa. But near melting point spall strength of water, hexadecane, pentadekane, and glycerol is a strong function of strain rate. It was shown that the double metastable state of water was realized during our experiments when the initial temperature was 0.4 $^{\circ}$C. Maximum value of strength 142 MPa was found for glycerol. The process of destruction in hexadecane and methyl alcohol is double staged. At the first stage formation of cavities starts and there is a kinked at free velocity profile was observed. At the second stage the cavity grow rate increases and the spall pulse occurs. Theory of homogeneous bubble nucleation was used to explain the experimental results.\\[4pt] In collaboration with Sosikov Vasiliy, Institute of Problems of Chemical Physics RAS.