Experimental investiganios of deformation and fracture of plates at repeated impact loading
The paper describes the experimental complex designed for impact testing of thin-walled structural elements, as well as the results of experiments on one-time and repeated impact deformation of square plates. The experimental complex uses an induction-dynamic motor as loading device, which allows to conduct repeated impact loading. Impact test were done on thin square steel hinged plates. The time variation of strain components were determined by use of strain gauges and analog-digital converter connected to PC. Experiments on repeated impact loading show that averaged number of cycles to plate's punching is equal to 79 cycles, which coincides to low-cycle area.