SU1516869A1 - Installation for testing materials for cyclic impact loads - Google Patents

Abstract

The invention relates to a test apparatus, in particular, to installations for testing samples of materials and products for strength under the action of centrifugal forces and cyclic shock loads. The purpose of the invention is to expand the types of applied loads through the implementation of both shock loads and centrifugal forces with shock loading with independent control of centrifugal and shock loads. The body has grips 3 and 4 for sample 5, a drummer 6 with a spring 7, a device for lowering and pulling the hammer 6 in the form of a sleeve 8, which is a disk, with a groove 9 and two ring platforms 12 and 13. On platform 12, rigidly The groove 14 is connected to the holder 8, and the centrifugal load 10 is fixed on the gripper 3. When the holder 8 and the platforms 12 and 13 are rotated, the sample 5 is loaded with centrifugal forces and cyclic shock loads. 1 hp f, 2 Il.

Description

. one

(21) 4382806 / 25-28

(22) 02.23.88

(46) 10/23/89. Bksh. No. 39

(71) All-Union Scientific Research Institute of Mining Geomechanics and Surveying

(72) E.V.Lodus

(53) 620.163.4 (088.8)

(56) USSR Author's Certificate No. 1385022, cl. G 01 N 3/34, 1986.

(54) INSTALLATION FOR TESTING MATERIALS ON CYCLIC SHOCK LOADS

(57) The invention relates to a test apparatus, in particular to installations for testing samples of materials and products for strength under the action of centrifugal forces and cyclic shock loads. The purpose of the invention is to expand the types of applied loads by implementing both shock loads and centrifugal forces with shock loading with independent control of centrifugal and shock loads. The body has grips 3 and 4 for sample 5, a drummer 6 with a spring 7, a device for lowering and raising a drummer in the form of a clip 8, which is a disk, with a groove 9 and two ring platforms 12 and 13. On platform 12, rigidly A groove 14 is connected to the holder 8, a centrifugal load 10 is fixed on the gripper 3. When the holder 8 and the platform 12 and 13 are rotated, the sample 5 is loaded with centrifugal forces and cyclic shock loads. 1 hp ff, 2 ill.

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The invention relates to testing equipment, in particular, to installations for testing samples of materials and products under the action of centrifugal forces and cyclic shock loads.

The purpose of the invention is to expand the types of applied loads through the implementation of both shock loading and centrifugal forces with shock loading with independent control of centrifugal and shock loads.

FIG. 1 shows the installation diagram, top view; in fig. 2 is a section A-A in FIG. one.

The installation includes a housing 1, a rotational drive 2 installed therein, grips 3 and 4 of sample 5, a drummer 6 with a spring 7 intended to interact with the claw 3 and a device for charging and descending the drummer 6, made in the form of an actuator 2 rotation of the holder 8 with the guide groove 9. The holder 8 is a disk, the guide groove 9 in which is diametrically positioned. The installation is equipped with a centrifugal load 10 associated with the gripper 3, the additional rotational drive 11 and two concentrically arranged annular platforms 12 and 13, the internal platform 12 is connected to the additional drive 11 and has a diametrical groove 14 whose width is equal to the width of the guide groove 9 the disc and the length of each section not less than the length of the striker 6 (Fig. 1, size f. The outer platform 13 is rigidly connected with the disc by means of strings 15. The inner diameter of the inner platform 12 is equal to the diameter of the wild. Free end of the spring 7 is closed flax on the outer platform 13. For simultaneous testing of two samples at different levels of centrifugal forces, the installation is equipped with grippers 16 and 17 of the second sample 18 and additional centrifugal load 19 placed diametrically opposite to grippers 3 and 4 of the first sample 5. Mass ratio of centrifugal loads 10 and 19 is determined by the required ratio of centrifugal forces on samples 5 and 18, respectively.

The installation works as follows.

Actuators 2 and 11 are turned on and the disk and platforms 12 and 13 are rotated at equal speeds in one direction, the rotation speed is brought to the level at which centrifugal weights 10 and 19 create the required centrifugal forces on samples 5 and 18. The external rotation speed is an annular platform 13 and a disc with respect to the rotational speed of the inner annular platform 12, as a result of which the guides groove 9 rotates relative to pava 14 of platform 12 and at the moment of coaxial arrangement of the grooves 9 and 14, the pruning 7 moves the hammer 6 and loads the sample 5 ud by effort. Further rotation of the platform 12 leads to a new displacement of the striker 6 relative to the fixing point of the free end of the spring 7 and stretching it, and at the time of the new coaxial placement of the slots 9 and 14, the striker 6 moves and loads the sample 18. To change the loading frequency of the impact pulses The difference between the speeds of rotation of the disk and the inner platform 12 is changed, the speed of rotation of the platform 12 is changed to change the level of the centrifugal load. The parameters of the spring 7 and the mass of the striker 6 are selected so that the spring 7 o ensured the movement of the striker 6 to overcome the centrifugal force arising from the rotation of the striker 6 on the platform 12.

The installation allows testing both under separate applications of the required loads (shock loads, centrifugal loads), and when they are jointly applied to the test specimens — Sentential addition of specimens subjected to centrifugal loads). The installation provides independent adjustment of the parameters of the impact and centrifugal loads. loadings. I

Claims (1)

1. An apparatus for testing materials for cyclic shock loads, comprising a housing, a rotation drive mounted therein, specimen grips, designed to interact with one of the grippers a hammer with a spring and a device for striking and lowering the impactor, made in the form of a motorized rotation of the yoke with a guide groove, characterized in that in order to expand the types of applied loads by performing both shock loading and centro 1516869 a diametrical groove whose width is equal to the width of the guide groove of the disk, and the length of each section is not less than the length of the impactor, the outer platform is rigidly connected to the disk, the inner diameter of the inner platform is equal to the diameter of the disk, and the free end of the spring is fixed to the outer running effort with shock loading, .., with independent regulation centro. platform. bend and shock loads, yoke2. The installation according to claim 1, about tl and h is made in the form of a disk, guided by the fact that, in order to increase the groove in which the diaphragm performance is located, the installation is equipped with a test centrifugal load associated with one, two samples at different levels it from the grips, additional pre-centrifugal efforts, it is equipped with water rotation and two concentric ring platforms, the inner platform is connected to an auxiliary drive and has 20 grippers of the second sample and additional centrifugal load placed diametrically opposite to the grips of the first sample. 1516869 a diametrical groove whose width is equal to the width of the guide groove of the disk, and the length of each section is not less than the length of the impactor, the outer platform is rigidly connected to the disk, the inner diameter of the inner platform is equal to the diameter of the disk, and the free end of the spring is fixed to the outer .. platform. centrifugal force it is equipped grippers of the second sample and additional centrifugal load placed diametrically opposite to the grips of the first sample.  A a -rS FIG. 2