RU2376567C1 - Device for bending test of thin specimens - Google Patents

Abstract

FIELD: testing equipment.

SUBSTANCE: device includes base with load creating device fixed thereon and providing movement of movable plate on which there installed are supports for tested specimen to be arranged on them, fixed plate with central support fixed on it. Base has cavity in which sleeve for installation of load creating device is arranged. Supports installed on movable plate are equipped with rigidly fixed "П"-shaped restrictors of longitudinal and transverse movements of specimen. Fixed plate has central hole and installed by means of racks on additional base. In central support there is cavity in which piezoelectric transducer of system for recording acoustic and emission signals in the specimen is arranged during test. Strain gauge of force is fixed on fixed plate, made in the form of hollow cylinder with flanges, upper of which is attached to fixed plate and has central hole coaxial relative to hole made in fixed plate, and lower one is attached to central support on external side, and on internal side it is rigidly attached to one end of cylindrical pin passing through central holes made in upper flange of strain gauge of force and fixed plate. On the other end of the pin a reflector is installed in order to provide non-contact connection to optic displacement measuring instrument.

EFFECT: enlarging functional capabilities.

2 dwg

Description

The proposed technical solution relates to testing equipment, namely, devices for experimental studies of strength properties and processes of defect formation in thin samples from promising structural materials during bending tests.

Known devices for testing samples of structural materials for bending, for example, proposed in [1] (Testing technique: Handbook. In 2 books. / Ed. By V.V. Klyuyev. - M .: Mechanical Engineering, 1982 - Prince. 1. 1982. - 528 p.), Containing the base with a device for creating a load fixed on it, providing movement of the movable plate, on which supports are installed to accommodate the test sample, the test sample, freely mounted on the supports, a fixed plate fixed on the base with help racks on which you install ene central support.

A significant drawback of the noted technical solutions, limiting the scope of their application, is the impossibility of studying the processes of defect formation (processes of nucleation of defects, their development, etc.) in thin samples from promising structural materials during bending tests. The noted drawback is due to the fact that the design of the devices (power elements, their relative position and relationship during the loading of the test sample) exclude the installation of measuring equipment, in addition to additional (external), for recording parameters of defect formation processes, while the use of additional measuring equipment complicates the experimental devices and making errors in the test results, reducing their accuracy. Along with this, the combination of power elements in a rigid closed structure leads to the appearance of a significant number of random disturbances (during operation of the device to create a load, during interaction and deformation of power elements with each other during testing, etc.), which significantly affects the accuracy of the results tests and excludes the study of processes of defect formation in thin samples from promising structural materials.

According to the set of features, the closest analogue of the proposed technical solution is a device for testing bending of sheet steel, proposed in [2] (Sergienko V.M., Zhuravlev V.T., Antipanov V.G., Svoikin V.A., Kornilov V. .L. A device for testing bending of sheet steel // RF patent for invention No. 23237133 according to application No. 2006146739/28 dated December 26, 2006, G01N 3/00, published on June 20, 2008) containing a horizontal base (foundation plate), horizontal movable and fixed plates, interconnected by means of vertical columns, bending op ry for receiving and loading of the test specimen mounted on the moving and fixed horizontal plate.

A significant drawback of the described technical solution, limiting the scope of its application, is the impossibility of studying the processes of defect formation (processes of nucleation of defects, their development, etc.) in thin samples from promising structural materials during bending tests, which is due to the fact that the design of the device (its power elements, their relative position and relationship during the loading of the test sample) excludes the installation of measuring equipment, except for additional (external th), for the registration of defect formation parameters, the use of additional measuring equipment complicates the experimental apparatus and the introduction of errors in the test results, reducing their accuracy. Along with this, the combination of power elements in a rigid closed structure leads to the appearance of a significant number of random disturbances (during operation of the device to create a load, during interaction and deformation of power elements with each other during testing, etc.), which also affects the accuracy of the results tests and excludes the study of processes of defect formation in thin samples from promising structural materials.

The task to which the proposed technical solution is directed is to expand the functionality of the test device.

The essence of the proposed technical solution lies in the fact that the device for testing thin samples for bending contains a base with a device attached to it to create a load, which allows the movement of a movable plate, on which supports are installed to accommodate the test sample, the test sample, freely mounted on supports, is stationary a plate with a central support fixed to it. The base has a cavity in which the sleeve is placed, made of damping material for installing the device for creating a load, the supports installed on the movable plate are equipped with rigidly fixed U-shaped limiters for longitudinal and transverse movements of the sample, the fixed plate has a central hole and is installed using racks on an additional basis, in the central support there is a cavity in which the piezoelectric transducer of the system for recording acoustic emission signals in the sample is placed in During the test process, the strain gauge force meter is mounted on a fixed plate, made in the form of a hollow cylinder with flanges, the upper of which is fastened to the fixed plate and has a central hole coaxial with the hole in the fixed plate, and the lower one is connected to the central support from the outside and from the inside the side is rigidly bonded to one end of a cylindrical rod passing through the central holes in the upper flange of the strain gauge force meter and a fixed plate, while at its opposite end is installed detecting reflector for contactless communication with the optical displacement meter.

The essence of the proposed technical solution is illustrated by drawings, where Fig. 1 schematically shows the proposed device for testing thin specimens for bending, and Fig. 2 shows an enlarged image of the support on a movable plate with a U-shaped limiter for longitudinal and transverse movements of the specimen.

The device for testing thin specimens for bending comprises a base 1 having a cavity 2 in which a sleeve 3 is made of damping material and a device 4 for creating a load with a rod 5, which moves the movable plate 6, supports 7 and 8 mounted on a movable plate 6, which are equipped with respectively U-shaped stops 9 and 10 of longitudinal and transverse movements of the test sample 11, freely placed on the supports 7 and 8, a fixed plate 12, mounted on an additional base 13 using racks 1 4 and having a central aperture 15, a central support 16 with a cavity 17, in which a piezoelectric transducer 18 of a system for recording acoustic emission signals in a sample 11 is placed during testing (not shown in FIG. 1), a strain gauge 19 made in the form of a hollow cylinder 20 with flanges upper 21 and lower 22. The upper flange 21 is fastened to the fixed plate 12 and has a central hole 23, coaxial to the hole 15 in the fixed plate 12. The lower flange 22 is connected from the outside to the central support 16, and from the inside it is simply fastened by one end 24 of the cylindrical rod 25 passing through the central holes 23 and 15 of the upper flange 21 and the fixed plate 12, respectively. A reflector 27 is mounted on the other end 26 of the rod 25 to provide contactless communication with the optical displacement meter (not shown in Fig. 1) for example with a triangulation displacement meter, interference displacement meter, etc.

The proposed technical solution works as follows.

Before starting the test, the sample 11 is freely placed on the supports 7 and 8 between the U-shaped stops 9 and 10, excluding its longitudinal and transverse movements.

At the command of the test management system, the device for creating the load 4 provides, using the rod 5, the supply of the movable plate 6, with the supports 7 and 8 installed on it, the stops 9 and 10 and the test sample 11 towards the central support 16.

The loading of the test sample 11 is carried out from the moment of contact of its surface with the central support 16 and continues until the moment determined by the goals and objectives of the tests, for example, until the specified deflection is reached at the point of contact with the central support 16, etc.

During loading during deformation of specimen 11, acoustic emission signals are recorded using a piezoelectric element 18 characterizing the processes of defect formation in specimen 11, axial force using a strain gauge 19 and axial displacement of the lower flange 22 of meter 19 using the associated element 25, reflector 28 and a non-contact optical displacement meter (not shown in FIG. 1).

In some cases, for example, with minimal deviations of the physicomechanical characteristics of the samples, the loading parameters can be controlled by the results of measurements of a non-contact optical displacement meter.

The technical result of the proposed device is to expand the functionality by conducting research on the processes of defect formation in thin samples from promising structural materials during bending tests.

The claimed technical solution, while maintaining the positive qualities of the analog devices and the prototype device described in the description, differs in comparison with them by the expansion of functionality due to the study of defect formation processes in thin samples from promising structural materials during bending tests and can be applied, for example, in the study of the processes of defect formation in thin samples of tape high-temperature superconductors in instrument making, mechanical engineering, court structure, aircraft, etc.

Information sources

1. Testing technique: Handbook. In 2 kn. / Ed. V.V. Klyueva. - M.: Mechanical Engineering, 1982 - Book 1. 1982.- 528 p.

2. Sergienko V. M., Zhuravlev V. T., Antipanov V. G., Svoykin V. A., Kornilov V. L. A device for testing the bending of sheet steel // RF patent for the invention No. 23237133, 2008 according to the application No. 2006146739/28 of 12.26.2006, G01N 3/00, publ. June 20, 2008

Claims (1)

A device for testing thin specimens for bending, comprising a base with a device for creating a load secured to it, moving a movable plate, on which supports are installed to accommodate the test specimen, a test specimen freely mounted on supports, a fixed plate with a central support fixed to it, characterized in that the base has a cavity in which there is a sleeve made of damping material for installing the device to create a load, supports mounted on p a movable plate, equipped with rigidly fixed U-shaped limiters of longitudinal and transverse movements of the sample, the fixed plate has a central hole and is installed using racks on an additional base, a cavity is made in the central support, in which the piezoelectric transducer of the system for recording acoustic emission signals in the sample is placed the test process, a strain gauge force meter mounted on a fixed plate, made in the form of a hollow cylinder with flanges, the upper of which is fixed with a fixed plate and has a central hole coaxial with the hole in the fixed plate, and the bottom is connected to the central support from the outside, and from the inside it is rigidly fastened to one end of the cylindrical rod passing through the central holes in the upper flange of the strain gauge force meter and the fixed plate, this reflector is installed on the other end of the rod to provide contactless communication with an optical displacement meter.

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