PSI - Issue 40

A.M. Ignatova et al. / Procedia Structural Integrity 40 (2022) 185–193

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Ignatova A.M. at al. / Structural Integrity Procedia 00 (2022) 000 – 000

filled with compressed air using a high-pressure compressor. A measurement system was used to register the velocity of the ball, providing for registering the time the impactor passed the control section of the movement trajectory, limited by a network of laser beams at the beginning and the end of the impactor's path. The video recording process is started by a trigger signal generated by the automated experiment system.

Fig. 1. Pneumatic unit for accelerating a steel impactor

A sample of potassium fluorophlogopite was placed in the holder of a unit so that only one end was rigidly fixed. Four impact experiments were performed with the following parameters: ball speed of 230 m/s and collision angle of 90°; ball speed of 120 m/s and collision angle of 90°; ball speed of 230 m/s and collision angle of 30°; ball speed of 120 m/s and collision angle of 30°. As an alternative to a frontal impact at an angle of 90°, the collision angle of 30° was chosen (Fig. 2) since it was previously experimentally proved that within such a position, ricochet conditions arise and the trajectory of the damaging element changes.

Fig. 2. Scheme of target hitting with a steel ball at an angle of 30°