SU1536260A1 - Installation for fatigue testing of specimen in bending - Google Patents

Abstract

This invention relates to a testing technique and is intended to test a sample of a material for flexural fatigue. The purpose of the invention is to enhance the functionality by providing tests with both constant and varying flexural strain during the experiment. The installation comprises a base 1, grippers 4, 5 and a loader in the form of coaxial wheels 9 and 10 connected with rotational drives 7 and 8, a slotted frame 12 mounted on the wheel 9 with diametrically displacements, and a tool 14, 15 for pressing the frame 12 to the wheel 10 placed in the slot 13. The change in the bending deformation of the sample is provided by changing the turning radius of the gripper 5 when the frame 12 is pressed against the wheel 10 rotated by the drive 8 at a speed different from that of the wheel 9. The tests with constant bending deformation are performed at Starting the actuator 8. 2 yl.

Description

movable 2 and fixed 3 racks, |., turn off the desired rotation radius at 20

thirty

two grippers 4 and 5 for sample 6 and a sample loader, which includes two drives 7 and 8 of rotation mounted on a rack 3 and kinematically associated axial wheels 9 and 0 connected to the respective drives. On the end surface of wheel 9 there is a guide with groove 1 1, in which the frame 12 is placed with the possibility of diametrical movement, the hammock 12 is made 25 nea with the central slot 13, in which the wheel I0 is placed with the possibility of frictional interaction with one of the opposite walls of the frame, the frame is set on fire to the side surface of the wheel 10 It is ensured by turning on wheels 9 electromagnetic catupacks 14 or 15 mounted on the end surface, on the core 16 of which rollers 17 are attached, which interact with frame 12, Chains of coils 14 and 15 are connected to a control unit (not shown). When the drive 8 is turned on, force the pressure of frame 12 the wheel 10 is sufficient to ensure the rotation of the wheel 10 together with the wheel 9 necessary for rotation of the grip 5 of sample 6.

Axial and sample loading is performed by shifting the stand 2 with screw 18; the offset of the grip 4 rack 2 produced by the screw

The installation works the next time

Sample 6 is set to grip

35

40

by means of

along

nineteen,

45

" 50

Water 8, the Frame remains pressed to the wheel 10 by a corresponding electromagnet, which allows, when the drive 8 is turned off, the wheel 10 is rotated at the speed of the wheel 9. The radius of rotation of the gripper 5 remains unchanged.

The asymmetry of loading cycles in all cases is regulated by the position of the grip 4 on the rack 2.

The nature of the change in the amount of bending strain during the experiment is determined by the loading circuit of a real object or by the reaction of the sample material to the deformation process.

Claims (1)

Invention Formula A bend fatigue testing apparatus containing a base, two racks, one of which is rigidly mounted on the base, and the other capable of moving along it, associated with the respective racks of the sample, the first of which is mounted on a movable rack, and a load including two rotational drives mounted on the fixed rack connected to the respective wheel drives and a rail linking both wheels to the rail, on which the second gripper is installed, characterized in that The goal of expanding the functionality by providing tests both at constant and variable bending strain during the experience of the sample is provided with a guide mounted in the groove with a frame in which a central slot is made to accommodate one of the wheels and two adjustable preloads 4 and 5. For circular bending tests (. The specimen bends over and over in the sample both include drives 7 and 8 with different speeds of rotation. It supplies current to the coil: or 15 electrons). Agnita and by corresponding movement of the armature 16 by means of rollers 17 draw in the frame 12 to the wheel 10. Due to the velocity difference „ |., the desired rotation radius is turned off at 20 thirty 25 35 40 45 50 55 Water 8, the Frame remains pressed to the wheel 10 by a corresponding electromagnet, which allows, when the drive 8 is turned off, the wheel 10 is rotated at the speed of the wheel 9. The radius of rotation of the gripper 5 remains unchanged. The asymmetry of loading cycles in all cases is regulated by the position of the grip 4 on the rack 2. The nature of the change in the amount of bending strain during the experiment is determined by the loading circuit of a real object or by the reaction of the sample material to the deformation process. Invention Formula A bend fatigue testing apparatus containing a base, two racks, one of which is rigidly mounted on the base, and the other capable of moving along it, associated with the respective racks of the sample, the first of which is mounted on a movable rack, and a load including two rotational drives mounted on the fixed rack connected to the respective wheel drives and a rail linking both wheels to the rail, on which the second gripper is installed, characterized in that The goal of expanding the functionality by providing tests both at constant and variable bending strain during the experience of the sample is provided with a guide mounted in the groove with a frame in which a central slot is made to accommodate one of the wheels and two adjustable gland accessories pred515362606 assigned to provide a friction-to-each-friend to a friend, the second gripper is secured by the interaction of the wheel located in the slot of the frame with the frame walls, the wheels are mounted coaxially on the frame, and the guide is placed on the end of the other wheel along its diameter. Friend to friend, second hold on the frame, and the guide is placed on the end of the other wheel along its diameter. FIG. g