SU872947A1

SU872947A1 - Deformation pickup

Info

Publication number: SU872947A1
Application number: SU772490322A
Authority: SU
Inventors: Анатолий Феодосьевич Миренков; Виктор Егорович Кузнецов; Федор Борисович Нежинов; Виктор Иванович Евдокимов
Original assignee: Предприятие П/Я А-1940
Priority date: 1977-05-27
Filing date: 1977-05-27
Publication date: 1981-10-15

Description

(54) ДАТЧИК ДЕФОРМАЦИЙ(54) DEFORMATION SENSOR

II

Изобретение относитс к измерению деформаций твердых тел с помощьюThis invention relates to the measurement of deformations of solids by

электрических средств и предназначено дл измерени деформаций внутри конструкций из затвердевающих материалов , например бетона.electrical means and is intended to measure deformations inside structures made of hardening materials, such as concrete.

Известен датчик деформаций, содержащий упругий элемент в виде стержн , рабочий тензорезистор, размещенный на боковой поверхности упругого элемента, компенсационный тензорезистор , размещенный на торцовой поверхности упругого элемента, и защитные кожухи дл рабочего и компенсационного тензорезисторов, зак-. репленные на упругом элементе Tl Недостатками известного датчика вл ютс сложность конструкции, зак- .лючающа с в необходимости двух за- щитных корпусов, а также плохое сцепление датчика с окружающей контролируемой средой из-за гладкости наружных поверхностей упругого элемента.The known strain sensor containing an elastic element in the form of a rod, a working strain gauge placed on the side surface of the elastic element, a compensation strain gauge placed on the end surface of the elastic element, and protective covers for the working and compensating strain gages, Zac. Replicated on the elastic element Tl. The disadvantages of the known sensor are the complexity of the design, namely, the need for two protective housings, as well as the poor adhesion of the sensor to the surrounding controlled medium due to the smoothness of the external surfaces of the elastic element.

Наиболее ..близким к изобретению техническим решением вл етс датчик деформацийсодержащий упругий элемент в виде стержн с поверхностью периодического профил на концах,рабочие и компенсационные тензорезисторы, размещен11ые на у ругом элементе в средней части, защитный кожух , охватьшающий часть упругого элемента-с тензорезксторами и закрепленный на упругом элементе 2J.Closest to the invention, the technical solution is a strain sensor containing a resilient element in the form of a rod with a periodic profile surface at the ends, work and compensation strain gages placed on the other element in the middle part, a protective cover covering a part of the elastic element — with strain gages and fixed on the elastic element 2J.

Однако конструкци этого датчика сложна, поскольку помимо упругого элемента и тензорезисторов содержит защитный кожух.However, the design of this sensor is complex, because in addition to the elastic element and the strain gages contains a protective cover.

Целью изобретени вл етс упрощение конструкции.The aim of the invention is to simplify the design.

Claims

This goal is achieved by the fact that the elastic element is made with rigid heads at the ends, on the outer surface of which a periodic profile is applied, and with a closed cavity along its length, the strain gauges are placed on the surface of this cavity, the workers - in the middle part, compensatory - in the area of the heads . Fig, 1 shows the proposed strain sensor, a general view; in fig. 2 - elements of which the strain sensor is assembled, general view The sensor consists (Fig. 1) of an elastic element 1 in the form of a rod, on which the heads 2 are placed. On their outer surface is a periodic profile 3. The elastic element is made of two rigidly connected , for example, glued, halves 4 5. Inside the elastic element along its entire length (FIG. 2) there is a closed cavity 6. On the surface of this cavity in the middle part of the elastic element are placed the resistance strain gages 7, and in the area of the heads compensatory strain gages 8 ikul angles to its working axis strain gauges working axis 7, the sensor installed within the test structure so that its axis coincides with the direction of the measured strain. After solidification of the material under test design, the sensor surface adheres to the material, especially due to the periodic profile 3 on the heads

2. When the structure is deformed, the elastic element 1 is deformed. Its deformations are perceived by working strain gauges 7. The temperature change of the material of the tested structure is compensated by compensatory strain gauges 8 Since strain gauges 8 are arranged perpendicular to the measured deformations, they do not perceive the measured deformations, and due to the rigidity of the heads 2 they do not perceive transverse inequalities of deforma- The use of the proposed sensor allows to reduce the cost of strain gauging complex structures under the influence of mechanical and thermal O loads due to the simplicity of the sensor structure. DETAILED DESCRIPTION OF THE INVENTION A deformation sensor comprising an elastic element in the form of a rod with a surface of a periodic profile at the ends, workers and compensatory strain gages placed on an elastic element, characterized in that, in order to simplify the design, the elastic element is filled with rigid heads at the ends on the outer surface. which a periodic profile is applied, and with a closed cavity along its length, strain gauges are placed on the surface of the cavity, workers are in the middle part, and compensatory ones are in the head area. Sources of information taken into account in the examination of 1, US Patent No. 2,599,578, cl, 73-88,5, 1950, 2, US Patent No. 3,481,189, cl. G 01 B 7/18, 1967 (prototype).