SU447597A1 - The method of determining the strength of the mixture - Google Patents

Description

one

The invention relates to methods for determining the strength of mixtures of known composition after heat treatment, used in metallurgy, construction, and so on.

Methods are known for determining the strength of a mixture after heat treatment by mechanical testing of samples.

However, these methods are not accurate enough due to the uneven degree of compaction of the reference sample and the mixture itself.

The purpose of the invention is to improve the accuracy of determining the strength of the mixture.

This is achieved by estimating the strength of the mixture according to the strength characteristics of the binder material, for which the relative area of the binder material in the cross section of the reference sample from the mixture is preliminarily determined, and samples of the binder material of this mixture are mechanically tested and the dependence of their strength is recorded. from heat treatment and uniformity of the binder material in the cross sections of the samples, taking into account the relative area of the binder in these sections, after which the NOSTA mixture itself, depending on the outcome of:

-equal

nonexpert

 8 is

equally

where abrav is the strength of the sample of binder material with its uniform distribution in cross section;

stbnevn is the strength of a sample of binder material with an uneven distribution in its cross section;

b — relative area of the binder material in the cross section of the reference sample from the mixture;

 - ultimate strength of the bonding material after heat treatment.

A relative sample of the binder material in cross section is determined from a reference sample from a mixture of known composition of known composition. Then samples are made of a binder material with an equal-sized reference sample from a mixture of cross section and they are heat treated, the required mode of which is provided by heating

samples, for example, in muffle furnaces. In the cross sections of these samples, a notch and the inclusion of foreign bodies, such as balls with a diameter of 1-1.5 mm, ensure uniform and non-uniform distribution of the binder material. After that, mechanical tests of these samples are carried out, fixing the ratio of their strengths to the strength of the sample with a uniform distribution of the binder material and determining the strength of the mixture itself, based on

indicated above dependencies.

Subject invention

A method for determining the strength of a mixture after heat treatment by mechanical testing of samples, characterized in that, in order to increase accuracy, the strength of the mixture is evaluated according to the strength characteristics of the binder material, for which the relative area of the binder material in the cross section of the reference sample from the mixture is preliminarily determined and samples of the binder material of this mixture are subjected to mechanical testing and the dependence of the change in their strength on heat treatment and uniformity of the binder material is recorded ala in the cross sections of samples according to the relative area of the binder in the

these sections, and then determine the strength of the mixture itself, based on the dependence:

a% avn ° none, .- d is equal

where stbrp is the strength of the sample of binder material with its uniform distribution in cross section;

stbnevn is the strength of a sample of binder material with an uneven distribution in its cross section;

b - relative area of the binder material in the cross section of the reference sample from the mixture;

Y eV is the ultimate strength of the binder material after heat treatment.