SU691726A1

SU691726A1 - Apparatus for studying the process of destruction

Info

Publication number: SU691726A1
Application number: SU782607109A
Authority: SU
Inventors: Натан Моисеевич Лицын; Алексей Яковлевич Садиков
Original assignee: Пермский политехнический институт
Priority date: 1978-04-19
Filing date: 1978-04-19
Publication date: 1979-10-15

Description

(54) УСТРОЙСТВО ДЛЯ ИССЛЕДОВАНИЯ ПРОЦЕССА РАЗРУШЕНИЯ. .(54) DEVICE FOR INVESTIGATION OF THE DESTRUCTION PROCESS. .

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Изобретение относитс к области испытани материалов, а именно к устройствам дл исследовани процесса разрушени токопровед щих материалов . .The invention relates to the field of testing materials, namely to devices for studying the process of destruction of conductive materials. .

Известно устройство дл определени прочности покрыти при деформации образца, в котором через образец пропускают.электрический ток, а о наличии трещин в покрытии суд т по г скачкообразному изменению контролируемого параметра A device is known for determining the strength of a coating when a sample is deformed, in which an electric current is passed through the sample, and the presence of cracks in the coating is judged by r abrupt changes in the monitored parameter.

Известно устройство дл исследовани процесса разрушени токопровод 1ДИХ материалов в образце, вл ющеес наиболее близким к изобретению по технической сущности и достигаемому результату, содержащее источник питани , провод дл подведени тока к образцу , добавочное сопротивление и регистрирующий узел 2.A device is known for studying the destruction process of the conductor of 1DIX materials in a sample that is closest to the invention in its technical essence and the achieved result, which contains a power source, a wire for applying current to the sample, an additional resistance, and a registering unit 2.

Известные устройства недостаточно устойчивы и надежны в работе.Known devices are not sufficiently stable and reliable in operation.

Целью изобретени вл етс повышение устойчивости и надежности рабо- . ты устройства. The aim of the invention is to increase the stability and reliability of the work-. you devices.

Это достигаетс тем, что устройство снабжено трансформатором, первична обмотка которого образована про водом дл подведени тока к образцу, а вторична обмотка соединена с регистрирующим; узлом, и конденсатором, 5 подключенным параллельно источнику питани и добавочному сопротивлению.This is achieved by the fact that the device is equipped with a transformer, the primary winding of which is formed by a wire for applying current to the sample, and the secondary winding is connected to the register; a node, and a capacitor, 5 connected in parallel with the power supply and the additional resistance.

На чертеже изображена принципиальна электрическа схема устройства.The drawing shows a circuit diagram of the device.

Устройство содержит источник 1 пил тани , провод 2 дл подведени тока к образцу 3 через добавочное сопротивление 4, причем провод 2, соедин ющий образец 3 с добавочным сопротивлением 4, вл етс первичной обмоткой трансформатора 5. Источник пи тани 1 и добавочное сопротивление 4 шунтируютс конденсатором 6. Вторична обмотка 7 трансформатора подключена к регистрирующему узлу 8.The device contains a source of sawing 1, a wire 2 for supplying current to sample 3 through an additional resistance 4, and the wire 2 connecting the sample 3 with an additional resistance 4 is the primary winding of the transformer 5. The power source 1 and the additional resistance 4 are bridged by a capacitor 6. The secondary winding 7 of the transformer is connected to the recording node 8.

Устройст во работает следующим об0 разом.The device operates as follows.

Claims

When the specimen 3 is loaded with mechanical force P, its mechanical and electrical characteristics change abruptly as the crack grows. The sample resistivity is also hopping. Since a constant voltage is applied to sample 3 (this is achieved by switching on capacitor 6), as the electrical resistance of sample 3 changes, the current in its circuit will change in a jump-like manner. In this case, pulses proportional to the derivative of the signal in the primary winding 2 will be induced in the secondary winding 7 of the transformer. With abrupt changes in the current in the primary winding 2, in the secondary winding 7 operating at a negligible load, voltage pulses with a sufficient for register amplitude. This device allows to place the sample and the transformer close to one another. This eliminates the need for large cross-connect wires. The use of the proposed device will increase the sensitivity, noise. stability, reliability of the circuit operation / Claims of the invention A device for studying the process of breaking current-carrying materials, containing a power source, a wire for conducting current to the sample, an added resistance and a recording unit, characterized in that, in order to improve the stability and reliability of the device, it is equipped a transformer, the primary winding of which is formed by a wire for applying current to the sample, and the secondary winding is connected to the registering node, and a capacitor connected in parallel power source and added resistance. Sources of information taken into account in the examination 1. USSR author's certificate number 351120, class, G01 N 3/00, 1969,

2. USSR author's certificate number 390405, cl. G01 H 3/00, 1971,

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