SU1422106A1 - Installation for testing specimens for fatigue in circular bend - Google Patents

Abstract

This invention relates to a testing technique. The purpose of the invention is to enhance the functionality by controlling the flexural deformation. The apparatus comprises a housing 1 with racks 2 and 3, grips 5 and 6 for sample 7, a loading device, including a drive 8 with a crank 9. To adjust the bending strain of the sample during the test, the installation is equipped with a platform 1 1 with a glass 12 fixed perpendicular Rno the surface of the platform, the rod 13, the stop 14, interact, they with the platform. The screw is provided with an axial displacement tool 18. When the actuator 8 is turned on, the crank 9 rotates the stop 14, as a result of which the platform 11 changes the direction of inclination so that the end of the glass 12 and the grip 5 rotate around a circle, deforming the sample 7 by a circular bend. To change the bending strain, the tool 18 mixes the rod 13 and the platform in the axial direction, which causes the change of the angle of inclination of the platform and the radius of rotation of the end of the specimen. In order to twist the sample, the tool 15 rotates the brush 13 and the platform 11 around its axis. 1 hp f-ly, 1 ill. i (L

Description

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The invention relates to testing equipment, to installations for testing samples of materials and products for fatigue in circular bending.

The purpose of the invention is to enhance the functionality by controlling the flexural deformation.

The drawing shows the installation, general view.

The installation includes a housing 1 with two stfki 2 and 3, the first of which has a transverse hole 4, connected with them, two grippers 5 and 6, and a device for rotating sample 7, including an actuator 8 and a curvature 9 with a shaft 10 coaxially with hole 4 in rack 2.

direction of the stop 14, its angle of inclination to the plane of rotation of the curved shaft 9 changes, causing the radius of rotation of the end of the lever with the hinge 17 and grip 5 to change. As a result, the radius of rotation of the end of the sample 7 changes and the bending strain of the sample. In this case, the slider 20 is displaced along the cup 12 and the axial load on the specimen does not arise, as well as it is absent in the asymmetric metric loading cycle with constant bending deformation. To regulate the torsional deformation, the latch 19 fixes the nut 18 on the screw and, with the aid of the actuator 15, rotates the shaft 13 about its axis. As a result of the boards, in the center of the platform 11, a perpen-form 11 with a gripper 5 is fastened otdikno its surface with a cup 12, with respect to the gripper b and twists the inverter 13, placed in the hole of the shaft 10 of the curved shaft, the stop 14 is installed on the curved shaft 9 parallel to the shaft 10 and interacts with the platform 11. The end of the stem 13 20 of the spike 9. is pivotally connected to the center of the platform 11 from the side opposite to the fixing side of the cup 12. The stem 13 is mounted with the possibility of axial movement. The grip 5 is fixed sharnarno at the end of the glass 12, and the glass 12 is made telescopic.

; The screw is provided with a drive 15 for turning it around its axis. The hinge 16 for connecting the platform 11 with the brush 13 and the hinge 17 connecting the cup 12 with the gripper 5 are made without the possibility of axial rotation.

The drive axial movement of the rod 13 vtspolnen in the form of a nut 18 with a latch 19.

Eye 7. All operations are performed without termination of the test. The frequency of the cycles is controlled by the speed of rotation of the crank formula of the invention.

Claims (2)

1. Installation for testing specimens for fatigue under circular bending, containing 30 The drive for turning the rod 13 is made The storing case with two columns, in the first of which a longitudinal guide groove is made, and in the second - a through transverse hole, the grips for the sample, one of which is installed in the guide groove with the possibility of longitudinal movement associated with the second gripper , a crank with a shaft placed in a through transverse bore, and connected with a worm with a nut, a drive, O7-lichuyuyu 4a so that with axial displacement-enhanced functionality neither: I'm along the screw. The glass 12 and the slider 20, in the form of adjustment, deform the ability to move along the axis of bending, the crank shaft is made with slider glass 12. Capture 6 is installed on the longitudinal hole, a device for slider 21 with a drive 22. The sample loading hinges 16 are made in the form of a 17 and are made of a cardan type. 40 placed in this hole is a rod; the plate operates as follows: a form associated with one end of the rod The drive 8 is turned on and the crankshaft 9 with the shaft 10 is rotated. The stop 14 moves along with the crank circumferentially and changes the direction of the plate-shaped inclination of the cup fixed to the center of the shape 11. The end of the cup 12 together with the ball part of the platform , by means of a hinge fixed in its central part, a stop with a roller, designed to interact with the plate 17 and the grip 5 moves around the circumference without rotation and moves around the circumference the end of the sample 7 fixed in the grip 5. Circular bending is performed ca 7 without rotation. The asymmetry of the loading cycles is set by the position of the slider 21 and the gripper 6 relative to the axis of the hole 4. To change the deformation of the sample from the clamp with the latch 19, release the nut 18 and rotate it, as a result of the joint, and place it in the glass to form a telescopic joint of the slide that is hinged second grab. 50 2. Installation according to claim 1, characterized in that the rod is cylindrical, and the installation is provided with an additional drive connected to the other end of the rod by means of a screw connection, designed to rotate the rod, and a lock, in relation to the grip b and twists the shredding 9. Eye 7. All operations are performed without termination of the test. The frequency of the cycles is controlled by the speed of rotation of the curvature, the glass fixed on the central part of the platform from the side, by means of the hinge fixed in its central part, the stop with a roller, designed to interact with the plate and the telescopic joint of the slide, with the second capture. 0 2. The installation according to claim 1, characterized in that the rod is cylindrical, and the installation is provided with an additional drive connected to the other end of the rod by means of a screw connection, intended to rotate the rod, and a lock,