SU741103A1

SU741103A1 - Method of determining material heat-proofness

Info

Publication number: SU741103A1
Application number: SU782675043A
Authority: SU
Inventors: Владимир Витольдович Пастушин; Владимир Ильич Пономарев
Original assignee: Предприятие П/Я А-3603
Priority date: 1978-10-11
Filing date: 1978-10-11
Publication date: 1980-06-15

Description

II

Изобретение относитс к области испытаний материалов.This invention relates to the field of material testing.

Известен способ определени теплс стЫЬсости материалов, заключающийс в том, что испытуемый образец нагружают посто нной нагрузкой, нагревают с посто нной скоростью и регистрируют измейение де4юрмации в зависимости от температуры i Недостатком известного способа вл етс низка точность определени .The known method for determining the heat content of materials is that the test sample is loaded with a constant load, heated at a constant speed, and the measurement of deaturmation depending on temperature is recorded. The disadvantage of this method is the low accuracy of determination.

Известен также способ определени теплостойкости материалов, заключающийс в том, что консопьно закрепленный об- 15 разец нагружают, непрерьтно нагревают в месте его закреплени н регистрируют температуру его нагрева 2.There is also known a method for determining the heat resistance of materials, which consists in the fact that the consoled specimen is loaded, continuously heated in the place of its fixation, and the temperature of its heating is recorded 2.

Этот способ вл етс наиболее близким к изобретению по технической сущности 20 и доспргаемому результату, однако дл него характерна низка точность определени , обусловленна неравномерностью распределени температуры в образцеThis method is the closest to the invention in technical essence 20 and the result to be spun, however, it is characterized by low accuracy of determination, due to the uneven distribution of temperature in the sample.

вследствие контакта с элементами нагружающего устройства.due to contact with the elements of the loading device.

Цель изобретени - повышение точности определени .The purpose of the invention is to improve the accuracy of determination.

Цель достигаетс тем, что в образце возбуждают резс ансные изгибные колебани не ниже, чем на второй гармсиике, нагружают образец статическим изгибом, в узле колебаний, определ ют зависимость резсвансной частоты колебаний нагруженного образца от температуры и по температуре, соответствующей резонансной частоте в момент начала ускоренной ползучести, определ ют теплостойкость материала.The goal is achieved by the fact that in the sample the excitement bending vibrations are not lower than in the second harmonic, the specimen is loaded with a static bend, in the oscillation node, the dependence of the resonance frequency of the oscillations of the loaded specimen on the temperature and temperature corresponding to the resonant frequency at the moment of the beginning of the accelerated creep, the heat resistance of the material is determined.

На фиг. 1 схематично представлена установка дл реализации способа; на фиг. 2 - график изменени зависимости резонешсной частоты от температуры испь таний , по ксггорому определ$аот теплостойкость материала.FIG. 1 shows schematically an installation for implementing the method; in fig. 2 is a graph of the change in the dependence of the resonant frequency on the temperature of intakes; the heat resistance of the material is determined according to pressure.

Claims

The installation contains a base 1, the test sample 2 is mounted in a cannon, the heater 3 is located under the sample 2, a thermocouple 4, installed at the place of the sample fixation, an oscillation pathogen consisting of electromagnets 5 and 6 interacting with the sample directly or through ferromagnetic nozzles 7 and 8 when testing samples from non-magnetic materials, as well as an electromagnetic device 9 for loading the sample with a static bend through a ferromagnetic nozzle 10. The test sample 2 is fixed; 1. If a sample of a non-magnetic material is tested, for example, made of polymers, then ferromagnetic nozzles 7 and 8 are installed on it. Heater 3 is turned on, resonant oscillations are excited in sample 2 using electromagnets 5 and 6 not lower than on the second harmonic and load it with the help of an electromagnetic device 9 static bending in the node of vibrations. If a sample of a non-magnetic material is tested, then a ferromagnetic nozzle 10 is set in the oscillation unit. During the tests, the heating temperature of the sample 2 at the point of its fixation and the change in the resonant frequency depending on the temperature are continuously recorded. According to this dependence, the temperature T 5 is found, corresponding to a sharp decrease in the resonance frequency of the oscillating sample 2, which indicates the beginning of the accelerated creep of the material. The value of the temperature found in this way determines the heat resistance of the materials. Claims The method for determining the heat resistance of materials, which consists in loading a cantilevered sample, is continuously heated in the place of its fixation, and its heating temperature is recorded, characterized in that, in order to increase the determination accuracy, resonant bending vibrations in the sample are not lower than at the second harmonic, the sample is loaded with a static bend in the oscillation node, the dependence of the resistive vibration frequency of the loaded sample on temperature and temperature is determined, respectively At the instant of accelerated creep, the heat resistance of the material is determined. Sources of information taken into account during the examination 1. USSR author's certificate No. 127850, cl. G 01 N 3/18, 1965.

2. USSR author's certificate number 110021, cl. G 01 N 3/18, 1956 (prototype).