FIELD: testing materials for strength. SUBSTANCE: pendulum 2 provided with weight 3 and specimen 5 secured on it by means of grip 4 are regularly raised and released by device having rotation drive 9 and platform 10 kinematically linked with drive; axis of rotation of platform 10 coincides with axis of oscillation of pendulum; device is provided with controllable clutch 12 for connecting the platform with axle 11 of pendulum. Mounted on bed 1 are two stops 6 and 7 which are used for engagement with impact transmitting device 8 mounted on specimen on its opposite sides. If clutch is disengaged after collision of member 8 with stop 7, specimen is subjected to alternating loading and if clutch is disengaged before collision of member 8 with stop 7, the specimen is subjected to constant loading. EFFECT: enhanced reliability. 1 dwg
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