The method of testing materials for resistance

 

(57) Abstract:

The invention relates to testing, in particular on the temperature, and is that the surface of the test sample material is subjected to cyclic thermal effects, including surface heating and subsequent cooling, producing a control surface of the test sample material. And about thermal stability is judged by the number of cycles of thermal cycles until cracks in the tested material sample, periodically removing a layer of material of a thickness corresponding to the intensity of wear of the material during the operation to ensure the technical result consists in increasing the reliability of determination of thermal stability of the material by taking into account the effect of surface material removal. 1 Il.

The invention relates to test equipment and in particular to methods of testing materials for resistance.

Analogue of the invention is a method of testing materials from the resistance, namely, that the specimens are subjected to several successive thermal cycles, periodically produce control samples, and the heat resistance is judged by the number of cycles until trinnie characteristics similar: "method of testing materials for resistance", "make control samples", "on thermal stability of the material is judged by the number of cycles until the occurrence of cracks in the sample coincide with the essential features of the invention.

The disadvantage of analogue is the low reliability of evaluation of heat resistance materials, working in conditions of one-sided surface heating due to insufficiently accurate reproduction characteristics of the heating of the material.

The prototype of the invention is a method of evaluating the heat resistance, namely, that the surface of the sample is subjected to cyclic thermal effects, including surface heating and subsequent cooling, and heat resistance is judged by the number of cycles of thermal cycles until the material fractures (ed. St. USSR N 1704024, CL G 01 N 3/60,), the essential features of the prototype surface of the sample is subjected to cyclic thermal effects, including heating and subsequent cooling, "on thermal stability is judged by the number of cycles of thermal cycles before the appearance of cracks on the surface of the sample coincide with the essential features of the claimed invention.

The disadvantage of the prototype is the low reliability of evaluation of heat resistance materials, due to insufficient the surface.

The problem to which the invention is directed, is to increase the reliability of determination of thermal stability of the material by taking into account the effect of surface material removal.

To achieve the technical result, the surface of the test sample material is subjected to cyclic thermal effects, including heating and subsequent cooling, as well as produce a control surface of the test sample. After cooling the sample surface material periodically remove a layer of material of a thickness corresponding to the intensity of wear of the material during operation. The control surface of the test sample of material is carried out after removing the layer of material from the surface of the sample after a specified amount of heat exposure or after each peak. About thermal stability of the material is judged by the number of cycles of thermal influence to the appearance of cracks on the surface of the test sample material. The essential features of the invention after cooling from the surface of the sample material periodically remove a layer of material of a thickness corresponding to the intensity of wear of the material during the operation and control Phares specified number of cycles of exposure to heat or after each cycle are different from the characteristics of the prototype.

The drawing shows the schematic setup of the method.

The sample material 1 is placed on the area of control, where control is performed to the sample surface, for example visual, and registers the start of the test cycles. Then, using the transporting body 2 sample enters the heating zone, where through the surface of the heater 3 (e.g., heater resistance, gas burner, laser or infrared beam) the sample is heated to a predetermined temperature at a given speed. After heating, the sample is moved into the cooling zone where it is cooled to a predetermined temperature, for example, by blowing compressed air through the nozzle 4. Then the sample is moved under the grinding head 5 (simulator wear), where the sample surface is removed, a layer of material of a specified thickness corresponding to the intensity of wear of the material under service conditions. The sample was then returned to the testing area. After that, the test cycle is repeated. Control of the sample surface is performed after a specified number of cycles or after each testing cycle is one of the known control methods, such as visual. Evaluation of heat resistance osushestvlyaetsya load on the surface of the material formed by thermal microcracks, the growth rate of which is determined by the intensity of thermal stress and mechanical and thermal properties of the material. Removal of material from the loading surface has a significant influence on the formation and development of microcracks. If the wear rate of the surface of the material exceeds the rate of growth of cracks, the cracks on the surface do not develop due to wear and may disappear from the surface. If the wear rate less than the rate of crack growth, which is formed on the surface of the cracks grow and develop deep into the material.

Thus the proposed method, which allows testing materials for resistance at temperature and intensity of material removal from the surface corresponding to the operating conditions, more accurate prediction of the material behavior during operation.

The method of testing materials for resistance, namely, that the surface of the test sample material is subjected to cyclic thermal effects, including heating and subsequent cooling, as well as produce a control surface of the test sample matsumotoi surface, characterized in that after cooling the sample surface material periodically remove a layer of material of a thickness corresponding to the intensity of wear of the material during the operation, and the control surface of the test sample of material is carried out after removing the layer of material from the surface of the sample after a specified number of cycles of exposure to heat or after each cycle.

 

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