CN111238946B - Method for determining self-tightening pressure of aluminum alloy liner fiber-wound gas cylinder through test - Google Patents
Method for determining self-tightening pressure of aluminum alloy liner fiber-wound gas cylinder through test Download PDFInfo
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- CN111238946B CN111238946B CN202010076619.6A CN202010076619A CN111238946B CN 111238946 B CN111238946 B CN 111238946B CN 202010076619 A CN202010076619 A CN 202010076619A CN 111238946 B CN111238946 B CN 111238946B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a method for testing and determining self-tightening pressure of an aluminum alloy liner fiber-wound gas cylinder. And (3) pasting a strain gauge at the same position on the outer surface of the fiber wound gas cylinder, then carrying out a hydraulic pressure test, and determining the optimal gas cylinder self-tightening pressure according to the measured strain data. Compared with the prior art, the invention can conveniently detect the optimal self-tightening pressure of the composite material gas cylinder with the aluminum alloy liner and the fiber wound composite material, thereby achieving the self-tightening treatment of the gas cylinder.
Description
Technical Field
The invention belongs to the technical field of experimental tests, and relates to a method for determining self-tightening pressure of a fiber-wound gas cylinder with an aluminum alloy liner.
Background
Currently, the aluminum alloy liner fiber fully-wound composite material gas cylinder is widely applied to high and new technical fields such as aerospace, pressure vessels, new energy automobiles and the like. Because the aluminum alloy inner container and the carbon fiber winding layer have different material mechanical properties, under the same strain state, even if the aluminum alloy inner container enters a plastic state to generate a yield phenomenon, the carbon fiber is still in an elastic low-stress state. To address this problem, the cylinders may be autofretched prior to application of the operating pressure.
Generally, the determination of the self-tightening pressure needs to be determined according to the DOT-CFFC and other standards, the optimal self-tightening pressure is subjected to finite element optimization design on the premise of meeting the DOT-CFFC and other standards, and the existing finite element design method for determining the optimal self-tightening pressure has the following defects: firstly, establishing a certain deviation between an aluminum alloy liner fiber fully-wound composite material gas cylinder model and an actual structure, and causing calculation errors; secondly, the failure criterion of the gas cylinder is adopted and cannot completely accord with the reality; thirdly, damage of the material in the machining process cannot be accurately estimated, and based on the reasons, the optimal self-tightening pressure determined by a similar method is not accurate. Therefore, a test method for determining the optimal self-tightening pressure of the aluminum alloy liner fiber fully-wound composite gas cylinder, which can meet the practical engineering application, is needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for testing and determining the self-tightening pressure of a fiber-wound gas cylinder with an aluminum alloy liner.
The purpose of the invention can be realized by the following technical scheme:
a method for testing and determining the self-tightening pressure of an aluminum alloy liner fiber-wound gas cylinder comprises the following steps:
(1) Taking an aluminum alloy liner, attaching a hoop stress sheet to the middle of the aluminum alloy liner, performing water filling and pressurizing test on the aluminum alloy liner, collecting stress and strain data, and preparing a stress-strain curve of the aluminum alloy liner based on the pressure and strain data;
(2) Obtaining the yield strength sigma of the aluminum alloy liner based on the stress-strain curve of the aluminum alloy liner 0.2 Yield strain epsilon 0.2 And a modulus of elasticity;
(3) Then taking a fiber-wound gas cylinder made of an aluminum alloy inner container made of the same material, attaching an annular stress sheet to the middle position of the fiber-wound gas cylinder, pressurizing water filled in the fiber-wound gas cylinder, simultaneously collecting stress and strain data, and when the collected strain reaches the yield strain epsilon of the aluminum alloy inner container 0.2 1.6-1.95 times of the pressure of the fiber-wound gas cylinder, wherein the corresponding test pressurizing pressure is the self-tightening pressure of the fiber-wound gas cylinder meeting the standard requirement.
Further, in the step (1), the water used for pressurization is replaced by other non-corrosive fluid media.
Furthermore, in the step (1), other non-corrosive fluid medium is hydraulic oil.
Further, the equipment used for pressurization is a pressure pump or a booster pump.
Furthermore, the equipment for collecting the stress is a pressure sensor arranged on the inner surface of the aluminum alloy liner or inside the fiber winding gas cylinder.
Furthermore, the equipment for acquiring the strain data is a strain measurement data acquisition system.
Further, when the collected strain reaches the yield strain epsilon of the aluminum alloy inner container 0.2 1.95 times of the pressure of the fiber-wound gas cylinder, wherein the corresponding test pressurizing pressure is the self-tightening pressure of the fiber-wound gas cylinder meeting the standard requirement.
Furthermore, the position of the annular strain gauge attached to the aluminum alloy liner is the same as the position of the annular strain gauge attached to the fiber winding gas cylinder.
Compared with the prior art, the invention realizes the detection of the optimal self-tightening pressure of the composite material gas cylinder wound by the fibers of the aluminum alloy liner through a simple and easy-to-operate test method, thereby achieving the self-tightening treatment of the gas cylinder.
Drawings
FIG. 1 is a stress-strain curve of an aluminum alloy liner;
FIG. 2 is a schematic diagram of a position to which a hoop strain gage is attached;
the notation in the figure is:
1-a fiber winding gas cylinder and 2-a circumferential strain gauge.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments, the pressure sensor may be MPM484ZL available from mike sensors, inc, and the strain data acquisition device may be TDS530 data acquisition device available from tokyo detectors, japan.
In addition, unless otherwise specified, all the other functional components or processing techniques are conventional components or processing techniques used in the art to achieve the corresponding functions.
The invention provides a method for testing and determining the self-tightening pressure of a fiber-wound gas cylinder with an aluminum alloy liner, which comprises the following steps:
(1) Taking an aluminum alloy inner container, attaching a circumferential stress sheet to the middle of the aluminum alloy inner container, carrying out water filling and pressurizing test on the aluminum alloy inner container, collecting stress and strain data, and preparing a stress-strain curve of the aluminum alloy inner container based on the pressure and strain data;
(2) Obtaining the yield strength sigma of the aluminum alloy liner based on the stress-strain curve of the aluminum alloy liner 0.2 Yield strain epsilon 0.2 And an elastic modulus;
(3) Then taking a fiber-wound gas cylinder made of an aluminum alloy inner container made of the same material, attaching an annular stress sheet to the middle position of the fiber-wound gas cylinder, pressurizing water filled in the fiber-wound gas cylinder, simultaneously collecting stress and strain data, and when the collected strain reaches the yield strain epsilon of the aluminum alloy inner container 0.2 1.6-1.95 times of the pressure of the fiber-wound gas cylinder, wherein the corresponding test pressurizing pressure is the self-tightening pressure of the fiber-wound gas cylinder meeting the standard requirement.
In one embodiment of the present invention, in step (1), the water used for pressurization may be replaced by other non-corrosive fluid media. Furthermore, in the step (1), other non-corrosive fluid media are hydraulic oil and the like.
In a specific embodiment of the present invention, the pressurizing device is a pressure pump or a booster pump.
In a specific embodiment of the invention, the device for collecting stress is a pressure sensor arranged on the inner surface of the aluminum alloy liner or inside the fiber-wound gas cylinder.
In a particular embodiment of the invention, the device for acquiring strain data is a strain measurement data acquisition system.
In one embodiment of the invention, the strain is collected when the strain reaches a value about equal to the yield strain ε of the aluminum alloy liner 0.2 1.95 times of the pressure of the gas cylinder, wherein the corresponding test pressurizing pressure is the self-tightening pressure of the fiber-wound gas cylinder meeting the standard requirement. This is because when the strain of the aluminum alloy inner container reaches ε 0.2 1.6-1.95 times of the total weight of the catalyst, 0.6 epsilon is generated after pressure relief 0.2 ～0.95ε 0.2 The fiber composite material of the outer layer is still in the elastic deformation range, and a compressive stress is generated on the aluminum alloy inner container, wherein the compressive stress is approximately equal to the product of the elastic modulus of the aluminum alloy and the residual deformation. Therefore, in order to keep the working stress of the cylinder as low as possible, the strain of the self-tightening should be taken～1.95ε 0.2 。
In a specific embodiment of the invention, the position of the annular strain gauge attached to the aluminum alloy inner container is the same as the position of the annular strain gauge attached to the fiber-wound gas cylinder.
Any of the above embodiments may be implemented alone, or any two or more of them may be implemented in combination.
The above embodiments will be described in more detail with reference to specific examples.
Example 1:
(1) The self-tightening pressure of the 6.8L composite material wound breathing gas cylinder is determined, and the designed working pressure of the gas cylinder is 35MPa.
(2) And a circumferential strain gauge is attached to the middle of the aluminum alloy liner of the gas cylinder and used for material strain detection.
(3) Connecting the gas cylinder into a water pressure testing system, connecting a strain tester, pressurizing until the gas cylinder is damaged, measuring the stress-strain data of the aluminum alloy liner, making a curve as shown in figure 1, and analyzing to obtain: yield strength sigma 0.2 =310MPa, yield strain ε 0.2 =0.44% and elastic modulus E =70GPa.
(4) According to the detection data, the self-tightening strain of the gas cylinder of the model is determined to be about 0.858%.
(5) And (3) attaching a circumferential strain gauge on the outer surface of the middle part of the gas cylinder wound with the carbon fiber composite material, referring to fig. 2, connecting a test system, applying internal pressure to the gas cylinder to perform self-tightening treatment, simultaneously recording strain data in the self-tightening process, stopping pressurizing when the strain reaches 0.88%, wherein the pressure is 54MPa, keeping constant pressure and stable for 30 seconds to relieve pressure, and completing the self-tightening treatment.
(6) The self-tightening pressure obtained in the process is 54MPa, namely the optimal self-tightening pressure of the gas cylinder of the type, and the method can be used for the self-tightening process of the gas cylinder of the type.
Compared with the optimal self-tightening pressure obtained by adopting a finite element analysis method, the optimal self-tightening pressure obtained by the method is basically consistent with the optimal self-tightening pressure obtained by adopting the finite element analysis method, but the method is simpler and more practical, is more practical for experimenters who cannot use limited analysis, has operability, and is also suitable for gas cylinders with different specifications and models.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.
Claims (4)
1. A method for testing and determining the self-tightening pressure of a fiber-wound gas cylinder with an aluminum alloy liner is characterized by comprising the following steps of:
(1) Taking an aluminum alloy inner container, attaching a circumferential stress sheet to the middle of the aluminum alloy inner container, carrying out water filling and pressurizing test on the aluminum alloy inner container, collecting stress and strain data, and preparing a stress-strain curve of the aluminum alloy inner container based on the pressure and strain data;
(2) Obtaining the yield strength sigma of the aluminum alloy liner based on the stress-strain curve of the aluminum alloy liner 0.2 Yield strain epsilon 0.2 And a modulus of elasticity;
(3) Then taking a fiber-wound gas cylinder made of an aluminum alloy inner container made of the same material, attaching an annular stress sheet to the middle position of the fiber-wound gas cylinder, filling water into the fiber-wound gas cylinder, pressurizing, simultaneously collecting stress and strain data, and when the collected strain reaches the yield strain epsilon of the aluminum alloy inner container 0.2 1.95 times of the pressure of the gas cylinder, wherein the corresponding test pressurizing pressure is the self-tightening pressure of the fiber-wound gas cylinder meeting the standard requirement;
the equipment for collecting the stress is a pressure sensor arranged on the inner surface of the aluminum alloy liner or in the fiber-wound gas cylinder;
the position of the annular strain gauge attached to the aluminum alloy inner container is the same as the position of the annular strain gauge attached to the fiber winding gas cylinder.
2. The experimental determination method for the self-tightening pressure of the fiber-wound gas cylinder with the aluminum alloy liner according to claim 1, characterized in that in the step (1), water used for pressurization is replaced by hydraulic oil.
3. The method for testing and determining the self-tightening pressure of the aluminum alloy liner fiber-wound gas cylinder according to claim 1, wherein the equipment for pressurization is a pressure pump.
4. The method for testing and determining the self-tightening pressure of the aluminum alloy liner fiber-wound gas cylinder according to claim 1, characterized in that the device for acquiring the strain data is a strain measurement data acquisition system.
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| CN112270117B (en) * | 2020-10-23 | 2024-05-17 | 大连航天高科科技有限公司 | Buckling analysis method for concave metal-containing liner of composite pressure vessel |
| CN113504103A (en) * | 2021-07-27 | 2021-10-15 | 山南市市场监督管理局 | Method for detecting pressure-bearing performance of liquefied petroleum gas steel cylinder filling process under high altitude condition |
| CN114659017A (en) * | 2022-04-18 | 2022-06-24 | 湖北三江航天江北机械工程有限公司 | Aluminum alloy liner for fully-wound hydrogen cylinder and cylinder test method |
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