Measurement Procedure of Ring Motion with the Use of Highspeed Camera During Electromagnetic Expansion

An optical measurement method of radial displacement of a ring sample during its expansion with velocity of the order 172 m/s and estimation technique of plastic flow stress of a ring material on basis of the obtained experimental data are presented in the work. To measure the ring motion during the expansion process, the Phantom v12 digital high-speed camera was applied, whereas the specialized TEMA Automotive software was used to analyze the obtained movies. Application of the above-mentioned tools and the developed measuring procedure of the ring motion recording allowed to obtain reliable experimental data and calculation results of plastic flow stress of a copper ring with satisfactory accuracy.

[1]  K. Ravi-Chandar,et al.  On the dynamics of necking and fragmentation – I. Real-time and post-mortem observations in Al 6061-O , 2007 .

[2]  L. M. Barker,et al.  Interferometric measurement of shock‐induced internal particle velocity and spatial variations of particle velocity , 1974 .

[3]  B. Song,et al.  Split Hopkinson (Kolsky) Bar: Design, Testing and Applications , 2010 .

[4]  D. E. Grady,et al.  Fragmentation of metal rings by electromagnetic loading , 1983 .

[5]  William H. Gourdin,et al.  Analysis and assessment of electromagnetic ring expansion as a high‐strain‐rate test , 1989 .

[6]  K. Kurzydłowski.  Modelling of the microstructure and properties in the length scales varying from nano- to macroscopic , 2010 .

[7]  William H. Gourdin,et al.  Development of the electromagnetically launched expanding ring as a high-strain-rate test technique , 1989 .

[8]  Geoffrey Ingram Taylor,et al.  The use of flat-ended projectiles for determining dynamic yield stress I. Theoretical considerations , 1948, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[9]  Frithiof I. Niordson,et al.  A unit for testing materials at high strain rates , 1965 .

[10]  W. E. Carrington,et al.  The use of flat-ended projectiles for determining dynamic yield stress III. Changes in microstructure caused by deformation under impact at high-striking velocities , 1948, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[11]  R. F. Recht,et al.  Stress-strain data obtained at high rates using an expanding ring , 1969 .

[12]  Stephen M. Walley,et al.  Review of experimental techniques for high rate deformation and shock studies , 2004 .

[13]  James R. Asay,et al.  The use of shock-structure methods for evaluating high-pressure material properties , 1997 .