SU1249304A1 - Method of determining residual stresses in tubular specimens - Google Patents
Method of determining residual stresses in tubular specimens Download PDFInfo
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- SU1249304A1 SU1249304A1 SU843746942A SU3746942A SU1249304A1 SU 1249304 A1 SU1249304 A1 SU 1249304A1 SU 843746942 A SU843746942 A SU 843746942A SU 3746942 A SU3746942 A SU 3746942A SU 1249304 A1 SU1249304 A1 SU 1249304A1
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- USSR - Soviet Union
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- sample
- strain gauge
- residual stresses
- generatrix
- signal
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Изобретение относитс к механическим способом определени напр жений и может быть использовано дл исследовани остаточных напр жений в трубчатых образцах. Целью изобретени вл етс повышение точности путем учета вли ни веса образца. После закреплени тензодатчика образец шарнирно опирают по его образующей так, чтобы радиус-вектор, проведенный в точку опирани образца, составл л с радиусом- вектором, проведенным в точку закреплени тензодатчика, угол, при котором изгибаюш,ий момент от силы веса образца в точке закреплени тензодатчика был равен нулю. Принимают сигнал тензодатчика за начальный. Разрезают образец вдоль образующей, а повторный сигнал снимают при опирании образца по образующей, расположенной в плоскости симметрии разрезанного образца. 4 ил. 1C 4 СО соThe invention relates to a mechanical method for determining stresses and can be used to study residual stresses in tubular specimens. The aim of the invention is to improve the accuracy by taking into account the effect of the weight of the sample. After fixing the strain gauge, the sample is hingedly supported along its generatrix so that the radius vector drawn to the sample point of the sample is equal to the radius vector drawn to the fixing point of the strain gauge, the angle at which the sample bends at the fixing point The strain gauge was zero. Take the load cell signal for the initial. The sample is cut along the generatrix, and the repeated signal is removed when the sample is supported along the generatrix located in the plane of symmetry of the cut sample. 4 il. 1C 4 WITH co
Description
Изобретение относитс к механическим снособам определени напр жений и может быть использовано дл иеследовани остаточных напр жений в трубчатых образцах, вырезаемых и деталей ипнин, э.чементов конструкиий и их заютовок.This invention relates to mechanical stress determination methods and can be used to investigate residual stresses in tubular specimens, cut out and ipnin parts, electrical designs, and their enclosures.
Цель изобретени -- иош пиение точности определени пч тем учета .. ш ии веса образца .The purpose of the invention is to determine the accuracy of determining the subject of consideration of the weight of the sample.
На фиг. 1 и 2 изображены схемы онира- ни неразрезанного образца; на фиг . 3 и 4 схемы опирани разрезанного вдоль образующей трубчатого образца.FIG. 1 and 2 depict diagrams of uncut sample; in fig. 3 and 4 schemes of the support of the tubular sample cut along the generatrix.
Снособ осуществл ют следующим образом .The method is carried out as follows.
На наружной (или внутренней) гювер.х- ноети образца в нроизвольной точке (например , В) закренл ют тензодатчик. Опирают образец но наружной (или внутренней) образующей (в точке А) так. что изгибающий момент от cH. i веса образца в точке .В равен нулю. Дл этого угол АОВ (фиг. 1 и 2) устанавливают равным 129° 20 . Решстриру- ют начальный сигнал тензодатчика (его соиротивление) . Разрезают образец вдо.чь образующей. Опирают разрезанный образец 1Ю наружной образующей (фиг. 3). Регистрируют сигнал тензодатчика Rz . Опирают образец по внутренней образующей (фиг. 4). Регистрируют сигнал тензодатчика .A strain gauge is attached to the outer (or inner) guernose pattern of the sample at the arbitrary point (for example, B). Support the sample but the outer (or inner) generatrix (at point A) so. which is the bending moment from cH. i the weight of the sample at point .B is zero. For this, the angle AOW (Fig. 1 and 2) is set to 129 ° 20. Solve the initial signal of the load cell (its synchronization). Cut the specimen together. Forming. Support the cut sample 1U outer generatrix (Fig. 3). Register the signal of the load cell Rz. Rest the sample along the inner generatrix (Fig. 4). A strain gauge signal is recorded.
Вычисл ют изменение сопротивлени тензодатчика , соответствующее то.;1ько остаточным деформаци м:Calculate the change in resistance of the strain gauge, corresponding to the.; 1 residual deformations:
,Ш.г. |( + ) - ., Sh. | (+) -.
Через коэффициент тензочувствите.ль- ности перевод т величины в остаточThrough the coefficient of strain sensitivities, values are transferred to the residual
ные деформап.ии ЕОП и далее но известным формула.м по остаточным деформаци м вычисл ют оста очные напр жени .The total deformations of the TFU and then the well-known formula. The residual stresses are calculated from the residual deformations.
При онирании разрезанного образца но схемам (фиг. 3 и 4), деформации, вызван- силами веса, внос т противоположный но знаку вклад в полные дефор.мации в т. В. Поэтому полусумма повторных сигналовWhen oning the cut sample but to the diagrams (Fig. 3 and 4), the deformation caused by the weight forces contributes the opposite to the sign to the total deformations in vol. V. Therefore, half the sum of repeated signals
-;,- ( 4 ), так же как и начальный сигнал RI, не зависит от сил собственного веса образца.-;, - (4), as well as the initial signal RI, does not depend on the forces of the own weight of the sample.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU843746942A SU1249304A1 (en) | 1984-02-27 | 1984-02-27 | Method of determining residual stresses in tubular specimens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU843746942A SU1249304A1 (en) | 1984-02-27 | 1984-02-27 | Method of determining residual stresses in tubular specimens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1249304A1 true SU1249304A1 (en) | 1986-08-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU843746942A SU1249304A1 (en) | 1984-02-27 | 1984-02-27 | Method of determining residual stresses in tubular specimens |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU1249304A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5101667A (en) * | 1989-04-04 | 1992-04-07 | Dune Travaux Spec. & Sagep | Method enabling a diagnosis to be made of the condition of a conduit or gallery and equipment for the implementation thereof |
-
1984
- 1984-02-27 SU SU843746942A patent/SU1249304A1/en active
Non-Patent Citations (1)
| Title |
|---|
| Механика полимеров. 1970, № 6, с. 1117. * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5101667A (en) * | 1989-04-04 | 1992-04-07 | Dune Travaux Spec. & Sagep | Method enabling a diagnosis to be made of the condition of a conduit or gallery and equipment for the implementation thereof |
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