SU855483A1 - Device for determination of hard material quality - Google Patents

Description

(54) DEVICE FOR DETERMINING QUALITY

The invention relates to the control of measuring equipment and can be used to determine the quality of solid materials simultaneously with the microhardness test, the study of the processes of grinding and destruction of minerals, ceramics, glass.

A microhardness testing device is known, comprising a loading mechanism, a mandrel with an indenter, and a microscope for measuring the dimensions of a print 11.

The disadvantage of this device is the limited accuracy of determining the quality of the material under study due to the impossibility of taking into account all factors affecting it.

The closest to the invention in its technical essence is a device for determining the quality of solid materials, comprising a loading mechanism, an acoustic emission transducer, a mandrel, and a size indenter in it. In this case, the converter is located directly under the sample and in contact with it. When the indenter is pushed into the sample, the transducer records acoustic emission signals, the characteristic of the MATERIALS

thermizing plastic deformation, nucleation and development processes

cracks (2).

The disadvantage of this device is the limited accuracy of determining the quality of the material under investigation from acoustic emission signals and the low reliability of identifying the zone of origin of signals in a sample due to the following reasons. When mechanically loading samples of inhomogeneous multicomponent materials, sources of acoustic emission may be areas that are not exposed to indentation of the indenter into the sample. When loading samples from acoustically anisatropic materials, as well as materials with a high attenuation of acoustic signals, acoustic emission signals

from the zone of indentation of the indenter into obra. The sensor is attenuated in the propagation path to the converter.

The purpose of the invention is to improve the accuracy of determining the quality of solid materials and increase the reliability of identifying the zone of occurrence of acoustic emission in a sample.

This goal is achieved by

30 that the acoustic transducer

The emission is reinforced directly in the mandrel, and the latter is made of a material that has the same acoustic resistance with the transducer material.

The drawing shows a device for determining the quality of solid materials.

The device contains a loading mechanism 1, a housing 2, in which a mandrel 3 is placed, an acoustic emission converter 4 and an indentor 5 fixed in the mandrel 3.

The device works in the following way.

The loading mechanism 1 generates a mechanical force transmitted through the housing 2 and the mandrel 3 to the indenter 5. In this case, the indenter 5 is inserted into the test section of the sample 6. Acoustic emitting signals resulting from plastic deformation and destruction of the sample in the zone of the indenter 5, spread through the indenter 5 and the mandrel 3 are fed to the transducer 4. By the parameters of the acoustic emission signals recorded by the transducer 4, the quality of the sample material 6 is evaluated. Making the mandrel 3 from the material, Commercially same acoustic impedance with the material preobravovatel 4, improves the passage of acoustic conditions. signals at the contact boundary of the mandrel 3 with the converter 4.

Thus, the proposed device allows to increase the efficiency of quality control of solid materials.

invention formula

A device for determining the quality of solid materials, comprising a loading mechanism, an acoustic generator; the missions, the mandrel and the indenter placed in it, characterized in that, in order to improve the accuracy of determining the quality

5 solid materials and increasing the reliability of identification of the zone of occurrence of acoustic emission in the sample, the acoustic emission transducer is fixed directly to the mandrel, and the latter is made of a material with the same acoustic impedance with the transducer material.

Sources of

5 taken into account in the examination

1.1. Yushkin I.P. Mechanical properties of minerals. L., Science, 1976, pp.91-92.

2.New in the field of microhardness testing. Sat articles. Ed.

A.P.Semenova. L., Science, 1974, p.212-216 (prototype).

Claims (1)

Claim A device for determining the quality of solid materials containing '0 loading mechanism, an acoustic emission transducer, a mandrel and an indenter located in it, characterized in that, in order to improve the accuracy of determining the quality of 15 solid materials and increase the reliability of identification of the zone of occurrence of acoustic emission in the sample, the transducer acoustic emission is fixed directly in the mandrel, and the latter is made of a material having the same acoustic impedance with the material of the transducer I.