RU2001383C1 - Tensile test method for building materials - Google Patents

Abstract

Use in construction for determining the strength characteristics of building materials The essence of the invention when testing a sample of material for tension is carried out by its deformation by equal deformation steps with a change in their respective tensile loads. After reaching the load corresponding to the tensile strength of the material, the load on the sample is reduced to the previous level of deformation. After that, the sample is loaded, deforming it to the previous and next stages. The procedure for deforming the sample is repeated until it breaks. The method provides a descending load - strain branch for all types of materials. 2 silt

Description

The invention relates to a realism, in particular, to methods for testing building materials for construction purposes, and can be used to determine the strength characteristics of building materials.

Methods are known for testing samples of materials for scattering at a constant speed or deformation.

The disadvantage of arbitrary methods is that when the load reaches the tensile strength, the sample ruptures and the descending branch of the load – deformation diagram is not fixed. redistribution of stresses to materials and construction "i

The closest technical solution to the invention is a tensile test method that is flat on a sample of building material, which involves securing a core zz -. the piggig of someone’s machine and the same .-: it is by applying the openings1C1: x mouths, and on the sample on both sides are fixed pads, graded in the elastic region, the tensile pattern of the specimen with overlays is recorded and the tensile pattern of the specimen pfp . che-oi from registered with the elastic properties of adjustments.

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branch is growing.

The disadvantage of this method is the possibility of tensile testing of only low-strength brittle mkphialoi. In addition, the need for terirooki steel linings and reusable use. They additionally sang decisiveness in the test results and yen h them to me.

An object of the invention is to expand the range of materials used and to increase the accuracy of testing.

The stated technical problem is solved by the fact that in the method of testing samples of building materials, including deformation of the sample by applying increasing tensile loads to it, measuring strain and loads and building a tensile diagram, the deformation of the sample is carried out in equal steps with the measurement of loads corresponding to the steps deformation, in this case, after reaching a load value corresponding to the tensile strength of the material during deformation of ° C

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blowing the next stage of deformation up to its rupture, the load on the sample is reduced until the previous stage of deformation is reached, after which the load on the sample is increased, deforming it by the value of the previous and subsequent stage of deformation,

In FIG. 1 shows a diagram of a device for implementing the proposed method; in FIG. 2 is a strain diagram of a sample.

The device for testing the sample 1 contains grippers 2 for the sample, fixed to the frame 3 and the lever 4, which through the rack 5 is also connected to the frame 3. To load the sample 1 on the lever 4 is suspended platform 6. The lever 4 is placed with the possibility of support on the lower 7 and upper 0 fixing screws fixed on a frame 9 mounted on the bed 3. To measure deformation, a calibration scale 10 is also used, which is also mounted on the bed 3.

The method is carried out as follows.

The test material sample 1 is clamped in the grippers 2. Then the sample is deformed by a predetermined strain by applying 2 tensile forces through the grippers, for which the plate 6 of the lever 4 is loaded with calibrated weights until the latter rests on the lower fixing screw 7. To deform the sample 1 to the next stage of deformation, the lever 4 is clamped with the upper fixing screw 8, and the lower screw 7 is lowered by the amount D and the loading of the Form G plate continues with calibrated loads until lever 4 reaches the new fixing position screw 7.

Deformations are measured on a calibration scale of 10. This test procedure continues until the tensile strength in the sample is reached, and then before deforming the sample to each subsequent step, the load is reduced until the previous strain level in the sample is reached. In this case, the lever 4 returns to the upper fixing screw 8. Then, the lower fixing screw 7 is withdrawn into the next stage of deformation D. Then the sample is deformed to the previous and next stage of deformation 2 D, loading the platform 6 and determining the load causing the sample to move to these two steps. The stretching of the sample in this way continues until it is completely eroded,

(56) 1. Troitska M.N. A manual for laboratory work in soil mechanics. - M .: ed. Moscow State University, 1961, p. 59-72.

2. USSR copyright certificate Ms 1635049, cl. G 01 N 3/08. 1988.

Claims (1)

The claims METHOD FOR TESTING EXAMPLES OF BUILDING MATERIALS FOR TENSION, INCLUDING deformation of the sample by applying increasing tensile loads to it, measurement of deformations and loads, and construction of a tensile diagram, characterized in that the deformation of the sample is carried out in equal steps with the measurement of loads corresponding to each stage of deformation, while after reaching a load value corresponding to the tensile strength of the material before deformation of the sample at each subsequent stage of deformation up to its rupture, the load on the sample is reduced to the previous level foam deformation, then increase the load on the sample, deforming to the previous and next stages of deformation. AND