SU1619126A1 - Installation for physico-mechanical investigations of specimens of materials - Google Patents

Abstract

The invention relates to installations for physicomechanical studies of material samples and allows to extend the functionality by providing damped oscillations not only torsional, but also bending loads, as well as providing tests under dual-frequency loading. Inertia weights 6 and 11 are mounted on the arms 9 and 10 with the possibility of movement. Due to the difference in arm lengths of the levers 9 and 10 with weights 6 and 11, the required flexural moment is created. When the drive 2 is turned on and the latch 8 is turned off, the loads 6 and 11 oscillate and then the elastic elements 7 load the sample 5 with damped oscillations of the twisting load. When drive 2 is off, the load increases and decreases at the same intensity. The direction of bending varies. For tests with two-frequency loading, periodically magnets 13 and 14 are turned on. 1 epfl, 1 slug. O d you o

Description

The invention relates to a testing technique, namely to testing materials under the action of a mechanical load.

The purpose of the invention is to expand the functionality by providing damped oscillations of not only torsional, but also flexural loads, as well as the provision of tests under dual-frequency loading.

The drawing shows the installation diagram.

The installation includes a housing 1, a rotary actuator 2 mounted thereon, rolls 3 and 4 for sample 5, one 3 of which is connected to the rotary actuator 2, an inertial load 6 associated with the second gripper A by means of opposing sides of the latter elastic elements 7, the latch 8 initial position g / for 6.

Two levers 9 and 10 are coaxially mounted on the second gripper 4 on opposite sides of it coaxially with each other. The installation comprises a second inertial load 11, a ball joint 12, with which the second gripper 4 is mounted on the housing 1. The loads 6 and 11 are placed on the arms with the possibility of changing the position.

The installation contains electromagnets 13 and 14 mounted on levers 9 and 10, and axially elastic elements 15 connecting electromagnets 1.3 and 14 with weights b and 11. Weights 6 and 11 are made of a ferromagnetic material.

The latch 8 of the initial position of the load 6 is made in the form of a spring-loaded core and a coil interacting with it.

The installation works as follows.

For testing with single-frequency loading, under the action of a bending moment, weights 6 and 11 are set on levers 9 and 10 in a position where the required bending moment on sample 5 is created due to the difference in lengths of the arms of the weights 6 and 11. turning the levers 9 and 10 with weights 6 and 11. The drive 2 is turned on and the sample 5 is twisted by means of the gripper 3, and the elastic elements 7 are deformed. The latch 8 is turned off and the levers 9 and 10 with weights b and 11 oscillate under the action of the elastic elements 7 and load the sample 5 with damped oscillations of the twisting load. In this case, if the actuator 2 continues to rotate sample 5, then the tests take place at different intensities of increase and decrease of load: when counter-bends of levers 9 and 10 and sample 5, the rate of increase of load on the sample is higher than when the levers turn in the direction of rotation of the samples 5. If when you turn off the latch 8 off also

and drive 2, the tests are carried out with equal intensity of increase and decrease of load. In both cases, sample 5 is also affected by the bending moment, which changes the direction of bending of the sample 5.

For tests in the absence of bending moment, weights 6 and 11 are set in the initial position at equal distances from the axis of grippers 3 and 4 or, if the weight of loads 6 and 11 is unequal, at distances x that are inversely proportional to their weight. This eliminates the occurrence of the psarot of gripping 4 in the hinge 12 relative to the axis of the sample 5 and the occurrence of a bending moment on the image of the center5.

For tests with two-frequency loading, electromagnets 13 and 14 are periodically turned on. At the same time, weights 6 and 1t are displaced in the direction of electromagnets

5 13 and 14, the elastic elements 15 are deformed, and after their deactivation they make cyclic movements along the levers 9 and 10 with a damped amplitude,

During the experiment, fix the load on

Claims (2)

0 sample 5 by measuring the forces on grippers 3 and 4 (twisting, bending) and deformations of the sample. The load and strain are recorded by known devices. Invention Formula 5 1. An installation for physicomechanical studies of material samples, comprising a body, coaxial grippers of a sample mounted on it, a rotational drive, an inertial load connected to one of them, 0 elastic elements, one of which is associated with the first inertial load, and a lock of its initial position associated with the load, connected with the second gripper and installed on its opposite sides, in order to expand its functionality by providing damped oscillations not only of a twisting load, but also of a flexural load, it is provided with a second inertial load, associated with the second gripper by means of a second elastic element, two associated with the second gripper and installed from the opposite ones with oron coaxial arms on which are installed sootvet5 stvuyuschie inertial loads to be longitudinally movable, and a spherical hinge, through which the second gripper is mounted on the housing. 2. Installation under item 1, from l and h ya schA - so that, for the purpose of ensuring test 516191266 under two-frequency loading, it is an inertial load by means of elastic it is equipped with electromagnets, each of them is axially oriented, and the inertial ones are mounted on the corresponding demonic weights made of a ferro-magnetic lever and are connected with the ones installed on a bit of material.