TY - JOUR N2 - 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. L1 - http://www.czasopisma.pan.pl/Content/90045/PDF/Journal10178-VolumeXIXIssue4_17.pdf L2 - http://www.czasopisma.pan.pl/Content/90045 PY - 2012 IS - No 4 EP - 804 DO - 10.2478/v10178-012-0071-2 KW - high-speed camera KW - electromagnetic expanding ring test KW - high-strain-rate deformation. A1 - Janiszewski, Jacek PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2012 T1 - Measurement Procedure of Ring Motion with the Use of Highspeed Camera During Electromagnetic Expansion SP - 797 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/90045 T2 - Metrology and Measurement Systems ER -