CN105092375A - Internal-pressure-cylinder pressure testing method and system - Google Patents
Internal-pressure-cylinder pressure testing method and system Download PDFInfo
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- CN105092375A CN105092375A CN201510428552.7A CN201510428552A CN105092375A CN 105092375 A CN105092375 A CN 105092375A CN 201510428552 A CN201510428552 A CN 201510428552A CN 105092375 A CN105092375 A CN 105092375A
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Abstract
The invention discloses an internal-pressure-cylinder pressure testing method and a system, and belongs to the technical field of examination equipment. According to the method, a solid elastic material is employed for replacing a conventional compression medium, and the solid elastic material is processed into a cylindrical compression body and is put into a test cylinder, the compression body generates radial expansion under the axial compression force and stresses the test cylinder, and an expected internal pressure and a loading process are obtained by controlling the loading speed of a press. If the test cylinder fails during an experiment, because the compression body is easily compressed, the pressure in the test cylinder rapidly decreases, and a large amount of energy is absorbed by the compression body. Therefore, the destroying capability of the residual energy to test on-site equipment and personnel is substantially reduced.
Description
Technical field
The present invention is a kind of internal pressure cylinder pressure test method for composite material pressure container and system, particularly relates to a kind of internal pressure cylinder pressure test method based on ordinary press and system, belongs to checking equipment technical field.
Background technology
Internal pressure cylinder application is extensive, present stage the main use material of China's internal pressure cylinder be steel, and the combination property of steel material own has certain restriction, brings certain drawback to the manufacture of internal pressure cylinder.And compound substance as a kind ofly having that designability is strong, material and structure have the new material of the superior functions such as homogeneity, specific strength is high, specific stiffness is high, be applied to internal pressure cylinder have very more than advantage: (1) compound substance internal pressure cylinder lighter in weight, Rigidity and strength are high; (2) compound substance can more effectively transmitted load than metal material, improves the fracture toughness of material; (3) corrosion resistant requirement can be met.And in the manufacture process of such cylinder, for checking its load performance, it is essential to carry out pressure test.According to GB150-1998, GB/T5563-2006, GB/T15560-1995, GBT4546-2008 regulation, the pressure test at present for internal pressure cylinder adopts the hydraulic testing or gas pressure test method to carry out usually.Conventional hydraulic test generally selects water as driving medium, and the viscosity that glassware for drinking water has is low, poor lubricity, electric conductivity are strong, pressure for vaporization high makes hydro-test occur easily leaking, Hydraulic Elements are easily worn and corrode and the defect such as anti-cavitation ability, and due to the material behavior temperature influence of compound substance itself comparatively large, therefore conventional hydraulic test requires higher to fluid temperature.And general gas pressure test requires strict, danger is very large, and the force of explosion of air pressure is very strong, requires very high, and must carry out 100% nondestructive examination to container major gap before test to the safety practice of test site.And, that gas pressure test or hydro-test all can only be carried out on special purpose test equipment, because pressure transmission medium in such test macro is liquid or gas, experimental facilities must have pipeline or the parts of carrying liquid or gas, and need in process of the test to take the mode adding end socket or inner bag to seal to pilot cylinder, air-tight test must be carried out before test, make testing equipment complex structure, process of the test operation inconvenience, and after in experimentation, cylinder breaks, pressure transmission medium is seriously polluted to testing ground, the protection difficulty of field staff and equipment is large.Therefore, be necessary to provide pressure pilot system and the method that simple, easy to operate, the on-the-spot pollution of a kind of structure is little, be convenient to protection.
Summary of the invention
In view of this, the invention provides a kind of internal pressure cylinder pressure test method and system, without the need to taking special seal approach to pilot cylinder in process of the test, testing ground is polluted little, and safeguard procedures are easy.
A kind of internal pressure cylinder pressure test method, the method adopts solids elastomeric material to replace conventional compression medium, and solids elastomeric material is processed into cylindric compression body and fills in pilot cylinder, compression body produces and is radially expanded under axial compressive force effect, pressure in producing pilot cylinder; Pressure and loading procedure in expection is obtained by controlled pressure machine loading speed.If pilot cylinder lost efficacy (fragmentation) in experimentation, because compression body is easy to be compressed, pressure in pilot cylinder can decline rapidly, and large energy is absorbed by compression body, greatly can reduce the damage capability of dump energy to testing ground equipment and personnel.
Further, described solids elastomeric material is silicon rubber.
A kind of internal pressure cylinder pressure pilot system, comprises pressing machine, upper platen, compression body, pressing disc, pilot cylinder, base, pressure transducer, deformation measurement assembly (foil gauge or tens(i)ometer) and worktable;
Described compression body is made up of solids elastomeric material and is cylindric;
The upper surface of described base is processed with two-stage stepped hole, and lower surface is processed with cylindrical boss, the central axis coaxial of stepped hole and cylindrical boss;
Described speed change measures assembly for measuring, recording the axial displacement of pressing machine head;
The upper surface of described worktable is processed with centralized positioning groove;
The cylindrical boss of described base is fixedly connected with after the centralized positioning slot fit of worktable, described pressure transducer is positioned on the bottom surface of second level stepped hole of base, the bottom surface of described pilot cylinder contacts with the first order step surface of base, described upper platen, compression body and pressing disc are from top to bottom sleeved in pilot cylinder successively, the bottom surface of pressing disc contacts with the upper surface of pressure transducer, and pressing disc is positioned at the outer circumference surface of pilot cylinder outside and contacts with the inner peripheral surface of the second level stepped hole of base; Described deformation measurement assembly is positioned at the side of press ram, and described pressing machine is positioned at directly over platen.
Further, clamp-on to prevent compression body in compression process and cause sample to lose efficacy between platen and pilot cylinder and platen cannot take off, when force value is more than 150-200MPa, nylon spacer is filled between compression body and upper platen, pressing disc, utilize the Poisson dilating effect after nylon pressurized, prevent compression body from clamp-oning between platen and sample, play the effect of obturator ring.
Beneficial effect: the present invention compares with air pressure pilot system with traditional hydraulic testing, can test on ordinary press, pilot cylinder is without the need to installing special packoff additional, in experimentation after cylinder sample inefficacy (fragmentation), resiliency compressible body pressure release speed is fast, testing ground is anhydrous, gas, wet goods traditional sucrose is to the pollution of testing ground, without the need to special safeguard procedures, and destruction sample fragment is easy to reclaim, be beneficial to the analytical work after test, reach simplification test macro, simple to operate, reduce and pollute, be convenient to the object of protecting, and pilot cylinder material is without particular restriction, be applicable to metal, pottery, the pressure test of the multiple cylinder such as compound substance, be conducive to utilization to apply.
Accompanying drawing explanation
Fig. 1 is one-piece construction axonometric drawing of the present invention.
Fig. 2 is one-piece construction sectional view of the present invention.
Wherein, the upper platen of 1-, 2-compression body, 3-pilot cylinder, 4-base, 5-deformation measurement assembly, 6-pressing machine, 7-pressing disc, 8-pressure transducer, 9-worktable.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
As shown in figure 1 and 2, the invention provides a kind of internal pressure cylinder pressure pilot system, comprise pressing machine 6, upper platen 1, compression body 2, pressing disc 7, pilot cylinder 3, base 4, pressure transducer 8, deformation measurement assembly 5 and worktable 9;
Described compression body 2 is made up of solids elastomeric material and is cylindric;
The upper surface of described base 4 is processed with two-stage stepped hole, and lower surface is processed with cylindrical boss, the central axis coaxial of stepped hole and cylindrical boss;
The upper surface of described worktable 9 is processed with centralized positioning groove;
The cylindrical boss of described base 4 is fixedly connected with after the centralized positioning slot fit of worktable 9, described manometric module 8 is positioned on the bottom surface of second level stepped hole of base 4, the bottom surface of described pilot cylinder 3 contacts with the first order step surface of base 4, described upper platen 1, compression body 2 and pressing disc 7 are from top to bottom sleeved in pilot cylinder 3 successively, the bottom surface of pressing disc 7 contacts with the upper surface of pressure transducer 8, and pressing disc 7 is positioned at the outer circumference surface of pilot cylinder 3 outside and contacts with the inner peripheral surface of the second level stepped hole of base 4; Described deformation measurement assembly is positioned at the side of press ram, and described pressing machine 6 is positioned at directly over platen 1.
Test procedure is as follows
The first step: compression body loaded in the middle part of pilot cylinder, is then respectively charged into upper platen and pressing disc from pilot cylinder two ends, platen, pressing disc, compression body three dead in line in guarantee;
Second step: pressure transducer is placed in immediately below pressing disc; Be fixed on worktable by deformation measurement assembly, its sensing device is positioned over the side of press ram;
3rd step: utilize fastening assembly upper platen, compression body, pressing disc, pilot cylinder and pressure transducer to be fixed on worktable, and guarantee the dead in line of above-mentioned parts and press ram;
4th step: starting pressure machine, with different rate of pressurization compression compression assembly, observes pressure transducer and deformation measurement assembly the data obtained, checks that whether its duty is normal.If there is exception, repeat step 2, three, four, until normal;
5th step: controlled pressure machine compression rate, in regulating, pressure and loading procedure carry out internal pressure test;
6th step: read pressure transducer and deformation measurement package records data, obtains compression body actual axial stress of bearing and strain variation history in process of the test, can obtain pressure change procedure in experimentation.
Relation derivation process between the axle pressure that compression body is born and the radial pressure of generation is as follows.
To get X-direction be cylinder axis to, utilize Hooke's law, can following formula be obtained:
In formula: ε
x-elastomeric axial strain;
σ
x, σ
r, σ
θthe stress in-elastic body x, r, θ direction;
The modulus of E-elastomeric material;
The Poisson ratio of μ-elastomeric material.
Think that process of the test elastomer is in rotational symmetry situation, then have:
σ
r＝σ
θ
Bring (1) formula into, carrying out simplify processes to it can obtain:
If use P
ipressure in representing, for interior pressure test sample, at inside surface, place has:
P
i＝-σ
r
Bring (2) formula into, can obtain:
In the present invention, compression body selects incompressible linear elastic materials, therefore μ=0.5, and bringing formula (3) into then has:
In formula,
for the elastic stress value of a given strain value in compression body.Above formula (4) is the relational expression between compression body axial compression and interior pressure, records elastic body axial stress σ
xwith displacement ε
x, pressure P in cylinder can be obtained
i.
If in process of the test, there is large deformation in compression body, and now, the interior pressure result that engineering stress strain value calculates is no longer accurate, should adopt ture stress-strain value.Engineering stress strain value and ture stress-strain value have relation shown in formula (5):
In formula:
-elastomeric axial true stress, strain;
ε, σ-elastomeric axial engineering stress, strain;
Now, the Young modulus of compression body is satisfied with another kind of stress-strain relation:
Namely
Bring (7) formula into (4) formula, the relational expression between compression body axial compression in large deformation situation and interior pressure can be obtained:
Because interior pressure can the impact of elastic body stress distribution by compression, reach one given required in pressure, diameter is less, and need the axial compression load that loads less, therefore, this means of testing is more suitable for small diameter cylinder sample.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. an internal pressure cylinder pressure test method, it is characterized in that, the method adopts solids elastomeric material to replace conventional compression medium, and solids elastomeric material is processed into cylindric compression body and fills in pilot cylinder, compression body produces and is radially expanded under axial compressive force effect, pressure in producing pilot cylinder; Pressure and loading procedure in expection is obtained by controlled pressure machine loading speed.
2. internal pressure cylinder pressure test method as claimed in claim 1, it is characterized in that, described solids elastomeric material is silicon rubber.
3. an internal pressure cylinder pressure pilot system, comprises pressing machine (6), upper platen (1), compression body (2), pressing disc (7), pilot cylinder (3), base (4), pressure transducer (8), deformation measurement assembly (5) and worktable (9);
Described compression body (2) is made up of solids elastomeric material and is cylindric;
The upper surface of described base (4) is processed with two-stage stepped hole, and lower surface is processed with cylindrical boss, the central axis coaxial of stepped hole and cylindrical boss;
The upper surface of described worktable (9) is processed with centralized positioning groove;
The cylindrical boss of described base (4) is fixedly connected with after the centralized positioning slot fit of worktable (9), described pressure transducer (8) is positioned on the bottom surface of the second level stepped hole of base (4), the bottom surface of described pilot cylinder (3) contacts with the first order step surface of base (4), described upper platen (1), compression body (2) and pressing disc (7) are sleeved in pilot cylinder (3) from top to bottom successively, the bottom surface of pressing disc (7) contacts with the upper surface of manometric module (8), the outer circumference surface that pressing disc (7) is positioned at pilot cylinder (3) outside contacts with the inner peripheral surface of the second level stepped hole of base (4), described deformation measurement assembly (5) is positioned at the side of press ram, and described pressing machine (6) is positioned at directly over platen (1).
4. internal pressure cylinder pressure pilot system as claimed in claim 3, is characterized in that, when force value is more than 150-200MPa, between compression body and upper platen, pressing disc, fills in nylon spacer.
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| CN201510428552.7A CN105092375A (en) | 2015-07-20 | 2015-07-20 | Internal-pressure-cylinder pressure testing method and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153234A (en) * | 2016-07-07 | 2016-11-23 | 甘肃广播电视大学 | Pressure data gathers and processing system and method automatically |
| CN106353178A (en) * | 2016-09-28 | 2017-01-25 | 攀钢集团研究院有限公司 | Gleeble sample loading tool |
| FR3057059A1 (en) * | 2016-09-30 | 2018-04-06 | Centre Technique Des Industries Mecaniques | MEASUREMENT INSTALLATION AND METHOD FOR MEASURING THE MECHANICAL RESISTANCE OF A HOLLOW BODY |
| CN108700493A (en) * | 2016-03-18 | 2018-10-23 | 英特尔公司 | The equipment extending transversely of mechanical test for stretchable electronic building brick |
| FR3082308A1 (en) * | 2018-06-11 | 2019-12-13 | Centre Technique Des Industries Mecaniques | APPARATUS FOR MEASURING THE MECHANICAL RESISTANCE OF A HOLLOW BODY |
| CN115855211A (en) * | 2023-03-04 | 2023-03-28 | 大禹节水（天津）有限公司 | Pressure-bearing detection method, device, control cabinet and system for base meter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108700493A (en) * | 2016-03-18 | 2018-10-23 | 英特尔公司 | The equipment extending transversely of mechanical test for stretchable electronic building brick |
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| CN106353178A (en) * | 2016-09-28 | 2017-01-25 | 攀钢集团研究院有限公司 | Gleeble sample loading tool |
| CN106353178B (en) * | 2016-09-28 | 2019-02-15 | 攀钢集团研究院有限公司 | A kind of Gleeble loading tool being less than graphite flake and tantalum piece radius suitable for radius of specimen |
| FR3057059A1 (en) * | 2016-09-30 | 2018-04-06 | Centre Technique Des Industries Mecaniques | MEASUREMENT INSTALLATION AND METHOD FOR MEASURING THE MECHANICAL RESISTANCE OF A HOLLOW BODY |
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| CN115855211A (en) * | 2023-03-04 | 2023-03-28 | 大禹节水（天津）有限公司 | Pressure-bearing detection method, device, control cabinet and system for base meter |
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