SU1395980A1 - Installation for testing material specimens for strength - Google Patents

Abstract

The invention relates to testing equipment, devices for testing the strength of materials and products under the action of axial and shear loads, and allows layer-by-layer deformation of the specimen by the cut due to the specimen deformed into a cut with different shear displacement rates and axial loads. The package of gears 1 is mounted on a common shaft 8. When they interact with the wheels 4, the sample 3 placed in the apertures 2 is deformed. Depending on the amount of energy accumulated on the flywheel 6, the sample is destroyed or deformed by layered cuts with different layer displacement velocities. 1 il.

Description

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The invention relates to a test technique, in particular to devices

for testing samples of materials and products for strength under the action of axial and shear loads

The purpose of the invention is to ensure the POST-LAYER deformation of the sample with different velocities of displacement nig; layers and axial load.

The drawing shows the scheme of the proposed installation.

The installation contains grips in the form of a package of gear wheels J with holes 2 and placement of sample 3, a loading mechanism in the form of a package tooth-4afbK wheels 4 according to the number of wheels 1, about 4 5 For rotation of wheels 4 and means for registering the destruction in ma: hvik 6 and clutch 7.

A package of gear wheels 1 of various dimensions, which are in contact with each other by side surfaces, is mounted on a common shaft 8 and engages with a package of gear wheels 4 on a roll mechanism mounted on a common shaft 9 with the possibility of interaction with a flywheel 6. Holes 2 samples 3 are eccentrically made I with the possibility of combining and coaxially additional grippers 10 and 1 1 connected to screw press 12L. Shaft 9 interacts with the flywheel 6 through friction discs I3 and

14

using hydraulic press 15.

The installation works as follows.

The rotation of the screws of the press 12 loads the sample 3 with an axial force of the required size. The actuator 5 is turned on and the clutch 7 rotates the flywheel 6, accelerating it to a speed that ensures the specified work deformation of the sample 3. After the flywheel accelerates, the clutch 7 is turned off. and, overcoming the resistance of the spring 19, the friction disk 13 is pressed against the disk 14. The rotation of the flywheel 6 is transmitted to the shaft 9, the package of gear axles 4 and the package of wheels 1. Wheels 1 come into rotation at various speeds determined by the ratio of wheel diameters. The displacement of the wheels I relative to the grippers 10 and 11 and

VNIIPI Order 2486/42

relative to each other leads to deformation of the sample 3 by a layer-by-layer slice with different velocities of the layers. Depending on the amount of energy accumulated on the flywheel 6, the sample 3 is destroyed or it is deformed to a predetermined deformation. In the case of sample failure, the work of destruction is determined by the energy difference on the flywheel 6 before and after the destruction, taking into account the friction in the moving parts of the installation. When loaded to a predetermined deformation, the defining operation is determined by the magnitude of the initial energy of the flywheel, taking into account the friction in the moving parts of the installation. The energy consumption for friction is determined by calibrating the installation without a sample. The experiments were carried out at different values and signs of axial load, at different ratios of wheel diameters, number of wheels and wheel width at different initial deformation rates, at different forms of displacement velocity distribution along the length of the sample.

In order to carry out the tests at slow deformation rates, use the manual actuator 20 to rotate the flywheel 6 with the constantly contacting disks 13 and 14.

Claims (1)

Invention Formula An installation for testing samples of materials for strength, comprising a gripper in the form of a package of coaxial wheels with coaxial holes for placing a sample, a loading mechanism in the form of a package of coaxial gear wheels, kinematically connected with corresponding gripping wheels, and a flywheel linked to the gripping wheels by means of a clutch intermittent action, characterized in that, in order to provide layer-by-layer deformation of the specimen by a cut at different displacement velocities of the layers and axial load, the axis of the sample holes is displaced The axis of the wheels of the grippers, which have different diameters, the kinematic connection of the gripping wheels and the loading mechanism is made in the form of gearing, and the installation is equipped with a device for compressing the sample. Circulation 847 Subscription