SU1613925A1 - Apparatus for testing specimens of materials - Google Patents

Abstract

The invention can be used to determine fatigue strength in tension and shear by lateral force and torque. The purpose of the invention is to expand the functionality by providing not only a shear, but also a tensile load with a single application of force. In the three loading cases 1-3 with a common central hole 4, test sample 7 is placed. Loading cases 1-3 with sample 7 are mounted on supports 5, 6 between the stops 9 and the sample is loaded with forces P ₁ and P through projections 10 made on the middle the sleeve is symmetrical to the hole 4. The force P _{1 is} applied at an angle α to the axis of the sample, and the force P ₂ is parallel to this axis. In each subsequent half-cycle of loading, the forces P ₁ and P ₂ are applied symmetrically to the forces of the previous half-cycle relative to the plane perpendicular to the sample axis. 5 il.

Description

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31

The invention relates to the testing of samples of materials, mainly concretes, and can be used to determine the fatigue strength under tension and shear by transverse force and torque.

The purpose of the invention is to expand the functionality by providing not only a shearing but also a tensile load with a single application of force.

FIG. 1 shows the general scheme of the device in FIG. 2 shows a section A-A in FIG. FIG. 3 shows a section BB in FIG. one; in fig. A - section bb In figure 1; figure 5 - diagram of the device, isometric.

Three rigid load-bearing cages 1-3 with a through central hole 4 are installed on flat surfaces of supports 5 and 6. Sample 7 is mounted in hole 4. The edges of supports 5 and 6 are aligned with edges 1 and 2 respectively. The end plates 8 of the overlay: 1 and 2 are mounted behind the supports 9 relative to the casing 3. On the central cage, protrusions 10 are made symmetrically to the hole, designed to apply loads P and V. The device works with: and :: we blow

in a way.

Hole 4 in o6oi iMax 1-3 is filled with a solution of concrete. After the concrete has hardened, the loading cages with the sample 7 are placed on the supports 5 and 6 so that the supports 9 are located in front of the pads 8 on the side of the cage 3. The loading of the sample 7 is carried out simultaneously by forces P and, applying 1. them to the middle part of the protrusions of the casing J .

Force 1 is applied) T obliquely at an angle L. to the axis of sample I, and the force P is parallel1) But it isG | axis, with P

 p J p p cospi. (The directions of the forces P / 1 and V cyclically change; these directions in FIGS. 1, 2, 5 are shown for adjacent half-cycles with continuous and dashed lines). In each subsequent half-cycle, forces are applied symmetrically by pre-1-shuchimu relative to a plane perpendicular to the axis of sample 7. Testing sample 7 is carried out until its fatigue failure,

five

F o rm y. l invention

A device for the use of samples of materials, including co. sleeves with a central hole for

0 fastening the shaped two supports on which the corresponding extreme clips are placed, and the middle o6om-ia is intended to apply the load to the sample, so that it is pressed 5 with the fact that, with the purpose) expansion

functionality: other opportunities due to the provision of not only cutting; to it, but also extending to ruzki with a single application of force, on two: x

, The opposite sides of the middle casing are made protrusions, one of which is intended for the application of a force inclined to the sample axis, and the other for applied axial force, is arranged) (the leg is provided with pairs of axially symmetrical supports fixed to the axis stops and pairs of pads fixed to the corresponding 1 gh extreme sleeves and designed to interact with the corresponding 1 and 1 stops n, which are placed between, h;

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FIG. four

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Claims (1)

SUMMARY OF THE INVENTION A device for testing samples of materials containing three coaxial clips with a central hole for fixing the figurative, two supports on which the corresponding extreme clips are placed, and the middle clip is designed to apply a load to the sample, which is I mean that, in order to expand the functionality by providing not only shear, but also tensile loads with a single application of force, protrusions are made on the / opposite sides of the middle holder, one of which It is intended for applying a force inclined to the axis of the specimen, and another for applying axial force, the device is equipped with pairs of supports fixed to the corresponding: supports symmetrical with respect to the axis of the central hole of the stops and pairs of plates fixed to the corresponding extreme clips and designed to interact with the corresponding stops that are placed between 5 'overlays. in FIG. 4