SU783642A1

SU783642A1 - Method of determining material flexible characteristics

Info

Publication number: SU783642A1
Application number: SU792727206A
Authority: SU
Inventors: Анатолий Иванович Солдатенко; Василий Иванович Печук
Original assignee: Киевский Институт Автоматики Им. Хху Съезда Кпсс
Priority date: 1979-02-22
Filing date: 1979-02-22
Publication date: 1980-11-30

Description

II

Изобретение относитс к области испытани материалов на прочность, а именно к способам определени упругих характеристик материала.The invention relates to the field of strength testing of materials, and specifically to methods for determining the elastic characteristics of a material.

Известен способ определени упругих характеристик материала, заклюЧсшлцийс в том, что образец материау ла помещают в захваты испытательной машины, нагружают раст гивгиощим усилием, измер ют усилие и деформацию и по полученным данным суд т о свойствах материгипа .A known method for determining the elastic characteristics of a material, concludes that a sample of a material is placed in the grippers of a testing machine, loaded with a tensile force, force and strain are measured, and according to the data obtained, the properties of the material are judged.

Недостатком этого способа вл етс невозможность определени упругих свойств материала непосредственно на технологической линии его изготовлени .The disadvantage of this method is the impossibility of determining the elastic properties of the material directly on the production line of its manufacture.

Наиболее близким к изобретению по технической сущности вл етс способ определени упругих характеристик материала, заключающийс в том, что образцы предварительно нат нутого материала фиксируют роликами , нагружают его заданным усилием , перпендикул рным к продольной оси образца, и замер ют усили предварительного нат жени и нат жени во врем его нагружени 2.The closest to the invention in its technical nature is a method for determining the elastic characteristics of a material, namely, that samples of a pre-tensioned material are fixed with rollers, loaded with a predetermined force, perpendicular to the longitudinal axis of the sample, and measure the forces of pre-tension and tension during its loading 2.

Недостатком этого способа вл етс его низка точность, из-за того,The disadvantage of this method is its low accuracy, due to

что не учитываетс проскальзывание образца в роликах.that does not account for sample slippage in the rollers.

Цель изобретени - повышен}1е точности способа.The purpose of the invention is to improve the accuracy of the method.

Дл этого дополнительно замер ют величину усили остаточного нат жени , а упругие характеристики материала определ ют по форм,ле. ES (Рр - РОСТ)- (РпреА- 2 РОСТ )т For this, the magnitude of the residual tension force is additionally measured, and the elastic characteristics of the material are determined from the shapes, f. ES (Рр - GROWTH) - (РпреА- 2 GROWTH) t

10 где ES - упругость материалаJ10 where ES is the elasticity of the materialJ

Ер - усилие нат жени во врем нагружени ,Ep is the tension force during loading,

Р - усилие остаточного нат жени ;P is the residual tension force;

1515

- усилие предварительного - pre effort

, нат жени )nature)

к - посто нный коэффициент m - масштабный коэффициент.k - constant coefficient m - scale factor.

На чертеже приведена схема осу20 ществлени , способа.Способ осуществл етс следующим образом.The drawing shows the scheme of implementation, method. The method is carried out as follows.

Claims

Sample 1 of the material is placed between two pairs of rollers 2, 3, 4, and 5. A pretension force is applied to the sample 1, and fixed on a length of 6. Then, the roller 6 loads the sample 1 with a force perpendicular to the longitudinal axis of the sample 1, and the tension p p during the loading is measured. Sample 1 is unloaded from the roller b from sample 1, and the residual tension force of sample 1 is measured. Then, the coefficient K and the scale factor m, determined by the type of material and lero sizes, are determined by the formula ES t (Рр - GROWTH) - РПРвА- 2 Growth} The method allows to increase the accuracy of determining the elastic characteristics by taking into account material slipping in the rollers and creates prerequisites for automating the measurement process by using the ACS to the computer in devices for its implementation. The invention of the method for determining the elastic characteristics of a material, is that a sample of a pre-stretched material is fixed by rollers loaded with a predetermined force perpendicular to the longitudinal axis of the sample, and the pre-tension and tension forces measured during loading are different. By the fact that, in order to improve the accuracy of the method, the magnitude of the residual tension force is additionally measured, and the elastic characteristics of the material are determined by the formula ES - Growth) (PpreA-2 POCT) W, where ES is the elasticity material Pp - tension force during loading / residual tension force (prestressing force) constant coefficient; scale factor, Sources of information taken into account in the examination 1.GOST 8537-72.

2. USSR author's certificate according to the application No. 2582829 / 25-28, cl. G 01 N 3/08, 1978, (prototype).