SU1444617A1 - Device for measuring limit deformation in bending of sheet material specimens - Google Patents

Abstract

The invention relates to devices for determining ultimate deformation during bending sheet materials. The aim of the invention is to improve the accuracy by ensuring that the sample is reliably pressed to the surface of the deforming element. Sample 2 is wound onto the spiral surface of cylinder 4, while simultaneously moving the object table 1 along the guides 10. Sample 2 is pressed to the subject table 1 along the pn-dius vector OM, and the applied test process is directed along the normal OD to the surface of the sample 2 .Hj

Description

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The invention relates to a measurement technique, in particular, to devices for determining the ultimate deformation at a sheet bending test.

The purpose of the invention is to improve the accuracy by ensuring reliable pressure of the sample to the surface of the deforming element.

The drawing shows the proposed device.

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The device contains an object table 1 for placing a sample 2, a first clamp 3 for securing one end of sample 2, mounted on the subject table 1, a deforming element in the form of a straight cylinder 4 with a variable radius of curvature of the cylindrical surface mounted on an axis 5 with the possibility of rotation. and vertical movement, the second clamp 6 fixed on the deforming element, rod 7, crossheads 8 and 9, guides 10, on which 20 the subject table 1 is capable of moving along them and which are intended to connect Tractors 7 and traverse 8 with a fixed grip 11 of a tensile machine, levers 12 fixed on an axis 5 of rotation of a cylinder 4 perpendicular to it and intended for communication through traverse 9 with a movable gripper 13 of a bursting mask, while guides and levers fixed relative to each other with the possibility of mutual movement in the direction perpendicular to the movement of the object table 1.- Cylinder 4 is statically balanced with the help of balance bar 14.

Prior to testing the sample, the device is fixed in the grips of the bursting mask so that the surface of the object- table is touching the spiral surface of cylinder 4 in a place with a known radius of curvature in which the sample is clamped to the cylinder 4 by the clamp 4. backgrounds 1 and

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Cram sliding grip 13 through levers 12, axis 5 of cylinder 4 and clamp 6 drives sample 2, which is wound on the spiral surface of cylinder 4, while simultaneously moving the subject table 1 along the guides 10. At the same time, the sample 2 is pressed along the subject table I along radius vector OM, and the applied load during the whole test is directed along the normal OD to the sample surface. The proposed device eliminates the possibility of spinning the elastic sample from the spiral surface of the cylinder, since the effective force and its components are closed at a smaller length DM of sample 2 as compared with the known device, as a result of which the initial loading pattern is maintained until the sample is destroyed.

Claims (1)

Invention Formula A device for determining the ultimate deformation during bending of specimens of sheet materials, containing a sample table for placing a sample, a first clamp for fixing one end of the sample, mounted on a subject table, a deforming element in the form of a straight cylinder with a variable radius of curvature of a cylindrical surface mounted for rotation and movement in the direction of the first clamp, the second clamp secured to the deforming element, characterized in that, in order to improve the accuracy, reliable compress the sample to the surface of the deforming element, it is provided with connecting rods, traverses and the guide on which the sample platform is mounted movably thereon and which are intended for communication via the thrust yoke and a fixed gripper tensile testing machine. it is convenient to combine the spiral surface with 40 levers fixed on the axis of rotation the beginning of the subject table 1, as a result of which the reading of the length of the deformed section of sample 2 to the place of its destruction is facilitated. Sample 2 is installed and pressed across the entire width on the object table 1 and on the spiral surface of cylinder 4, after which the gaps are broken the cylinder is perpendicular to it and intended to be connected through a traverse with a movable gripping of the discontinuous car, and the guides and levers are fixed relative to each other with the possibility of mutual displacement in the direction perpendicular to the movement of the object table. 0 five 0 - 0 Noah machines in the zero position and include the drive. Cram sliding grip 13 through levers 12, axis 5 of cylinder 4 and clamp 6 drives sample 2, which is wound on the spiral surface of cylinder 4, while simultaneously moving the subject table 1 along the guides 10. At the same time, the sample 2 is pressed along the subject table I along radius vector OM, and the applied load during the whole test is directed along the normal OD to the sample surface. The proposed device eliminates the possibility of spinning the elastic sample from the spiral surface of the cylinder, since the effective force and its components are closed at a smaller length DM of sample 2 as compared with the known device, as a result of which the initial loading pattern is maintained until the sample is destroyed. Invention Formula A device for determining the ultimate deformation during bending of specimens of sheet materials, containing a sample table for placing a sample, a first clamp for fixing one end of the sample, mounted on a subject table, a deforming element in the form of a straight cylinder with a variable radius of curvature of a cylindrical surface mounted for rotation and movement in the direction of the first clamp, the second clamp secured to the deforming element, characterized in that, in order to improve the accuracy, reliable compress the sample to the surface of the deforming element, it is provided with connecting rods, traverses and the guide on which the sample platform is mounted movably thereon and which are intended for communication via the thrust yoke and a fixed gripper tensile testing machine. the cylinder is perpendicular to it and intended to be connected through a traverse with a movable gripping of the discontinuous car, and the guides and levers are fixed relative to each other with the possibility of mutual displacement in the direction perpendicular to the movement of the object table.