CN115447175B - Winding tension adjusting method for composite material in gas cylinder - Google Patents
Winding tension adjusting method for composite material in gas cylinder Download PDFInfo
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- CN115447175B CN115447175B CN202211118914.9A CN202211118914A CN115447175B CN 115447175 B CN115447175 B CN 115447175B CN 202211118914 A CN202211118914 A CN 202211118914A CN 115447175 B CN115447175 B CN 115447175B
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- winding
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- film pressure
- gas cylinder
- pressure sensors
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- 238000004804 winding Methods 0.000 title claims abstract description 138
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 111
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000002356 single layer Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 14
- 238000000465 moulding Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a winding tension adjusting method for a composite material in a gas cylinder. The method comprises the following steps: firstly, a plurality of film pressure sensors are coated on a winding layer of a composite material in a gas cylinder according to a preset sensor distribution mode; then each film pressure sensor collects pressure data, the film pressure sensor corresponding to the winding layer with the same winding angle is used as a group of film pressure sensors, and then the pressure of the winding layers of the other layers with the same winding angle as the current group of film pressure sensors is calculated according to the pressure data collected by each group of film pressure sensors, so that the pressure of all the winding layers of the gas cylinder is obtained; and finally, calculating the residual tension of each winding layer of the composite material in the gas cylinder according to the pressure of all the winding layers of the gas cylinder, further obtaining a residual tension curve, and adjusting the winding tension of the composite material in the gas cylinder according to the residual tension curve. The invention has the beneficial effects of.
Description
Technical Field
The invention relates to a winding tension adjusting method in the field of pressure containers, in particular to a winding tension adjusting method for a composite material in a gas cylinder.
Background
The fiber winding forming process is to continuously wind the high-strength fiber impregnated with certain resin mass fraction onto the outer surface of the core mold or the lining according to the line type and the layering sequence preset by the program under the action of winding tension, and then to heat and solidify the fiber. Winding tension can significantly affect the strength of a fiber wound article by changing the fiber volume fraction of the composite.
The optimal molding state of the composite material gas cylinder is that all fiber layers are in an equal stress state in the circumferential direction after curing molding, and if winding tension is different, phenomena such as interlaminar sliding, wrinkling, fracture and the like of partial fibers in the fiber inner layer can be caused.
At present, more winding tension formulas only consider the extrusion acting force from the outside to the inside of the composite material layer, and less consideration is given to the force caused by shrinkage of the cured composite material. After the composite material is wound around the pressure vessel and cured, the residual tension is difficult to determine. And because the composite material gas cylinder fiber winding layer is wrapped, the inner fiber winding layer is difficult to measure, or the measurement is inaccurate due to the fact that the size of the sensor is limited, and the residual tension is difficult to measure.
Disclosure of Invention
In order to solve the defects in the background art, the invention provides a winding tension adjusting method for a composite material in a gas cylinder.
The technical scheme of the invention is as follows:
1) The plurality of film pressure sensors are coated on the winding layer of the composite material in the gas cylinder according to a preset sensor distribution mode, and each film pressure sensor corresponds to the winding layer coated on the film pressure sensors;
2) Each film pressure sensor collects pressure data, the film pressure sensor corresponding to the winding layer with the same winding angle is used as a group of film pressure sensors, and in each group of film pressure sensors, the pressure of the winding layers of the other layers with the same winding angle as the current group of film pressure sensors is calculated according to the pressure data collected by each group of film pressure sensors, so that the pressure of all the winding layers of the gas cylinder is obtained;
3) According to the pressure of all the winding layers of the gas cylinder, calculating the residual tension of each winding layer of the composite material in the gas cylinder, performing curve fitting on the residual tension of each winding layer to obtain a residual tension curve, and adjusting the winding tension of the composite material in the gas cylinder according to the residual tension curve.
In the 1), a plurality of film pressure sensors are coated on a winding layer of a composite material in a gas cylinder according to a preset sensor distribution mode, and specifically:
In the winding layer of same winding angle, from inside to outside first layer and last layer winding layer all cladding have corresponding film pressure sensor, evenly cladding has film pressure sensor in the winding layer between first layer and the last layer winding layer, and the installation height of each film pressure sensor is the same and the azimuth in the gas cylinder is different.
At least n/5 pressure sensors are arranged in the winding layers between the first winding layer and the last winding layer.
And 2) performing curve fitting on the pressure data acquired by each group of film pressure sensors, so as to obtain the pressure of the other layers of winding layers with the same winding angle.
In the 3), the calculation formula of the residual tension of each winding layer of the composite material in the gas cylinder is as follows:
Wherein T i represents the residual tension of the i-th winding layer, P i represents the pressure of the i-th winding layer, P i+1 represents the pressure of the i+1th winding layer, and delta alpha is the curing degree change rate; beta is the complete curing shrinkage of the resin; v r is the resin volume fraction; h is the thickness of the single-layer winding layer; r j is the outer diameter of the liner, and a i is the winding angle of the i-th winding layer.
The beneficial effects of the invention are as follows:
By properly arranging the film pressure sensor in the winding process of the composite material gas cylinder, the invention reduces the change of residual tension of a subsequent winding layer caused by the bulge of the composite material layer due to the thickness of the film pressure sensor as far as possible. The invention reduces the number of the film pressure sensors, improves the measurement accuracy of the residual tension of the winding layer, and is beneficial to guiding the winding tension setting in the subsequent winding process of the composite material gas cylinder; the method is helpful for ascertaining the change mechanism of the tension of the composite gas cylinder after curing.
Drawings
FIG. 1 is a schematic view of the overall layout of a pressure vessel
Fig. 2 is a schematic diagram of a pressure sensor layout.
Fig. 3 is a flow chart of the method of the present invention.
In the figure: 1. a gas cylinder liner; 2. a winding layer with a winding angle of a 1; 3. a wire; 4. a winding layer with a winding angle of a 2; 5. a winding layer with a winding angle of a k; 6. a membrane pressure sensor.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and specific examples:
as shown in fig. 3, the present invention includes the steps of:
1) As shown in fig. 2, a plurality of film pressure sensors are coated on a winding layer of a composite material in a gas cylinder according to a preset sensor distribution mode, each film pressure sensor corresponds to the winding layer coated by the film pressure sensor, namely the pressure of each film pressure sensor is the pressure of the winding layer coated by the film pressure sensor; in the figure, a film pressure sensor 6 is arranged between a winding layer 2 with a winding angle of a 1 and a cylinder liner 1, a winding layer 4 with a winding angle of a 2, a winding layer 5 with a winding angle of a k and a corresponding previous winding layer, the film pressure sensor 6 is arranged between two winding layers, and the film pressure sensor 6 is coated by an outer winding layer. In the specific implementation, before the outer layer fiber of the film pressure sensor is wound, the film pressure sensor is adsorbed on the gas cylinder fiber (or the lining) through forming liquid bridge force between the resin and the fiber (or the lining) of the inner layer, and after the next round of winding, the film pressure sensor is covered by the outer layer fiber. The lead 3 is connected with the film pressure sensor and led out to the bottle mouth of the gas bottle.
1) Wherein, a plurality of film pressure sensors are coated on the winding layer of the composite material in the gas cylinder according to a preset sensor distribution mode, and specifically comprises the following steps:
As shown in fig. 1, in the winding layers with the same winding angle, the first layer and the last winding layer from inside to outside are both coated with corresponding film pressure sensors, and the winding layers between the first layer and the last winding layer are uniformly (i.e. with the same number of layers) coated with film pressure sensors, i.e. with different radial distances, and the mounting heights of the film pressure sensors are the same and the azimuth angles in the gas cylinders are different.
At least n/5 pressure sensors are arranged in the winding layers between the first layer and the last winding layer, and the number of the film pressure sensors is rounded. For example, the number of the winding layers of the winding angle a is 5, and 1 film pressure sensor is coated on the first layer, the 5 th layer and the 3 rd layer of the winding layers, so that the number of the film pressure sensors is reduced, and the cost is further saved.
2) Each film pressure sensor collects pressure data, the film pressure sensor corresponding to the winding layer with the same winding angle is used as a group of film pressure sensors, and in each group of film pressure sensors, the pressure of the winding layers of the other layers with the same winding angle as the current group of film pressure sensors is calculated according to the pressure data collected by each group of film pressure sensors, so that the pressure of all the winding layers of the gas cylinder is obtained;
2) And (3) performing curve fitting on the pressure data acquired by each group of film pressure sensors, so as to obtain the pressure of the winding layers of the other layers with the same winding angle.
3) According to the pressure of all the winding layers of the gas cylinder, calculating the residual tension of each winding layer of the composite material in the gas cylinder, curve fitting the residual tension of each winding layer to obtain a residual tension curve, and regulating the winding tension of the composite material when the gas cylinder is wound according to the residual tension curve.
3) In the method, the residual tension of each winding layer of the composite material in the gas cylinder is calculated as follows:
Wherein T i represents the residual tension of the i-th winding layer, P i represents the pressure of the i-th winding layer, P i+1 represents the pressure of the i+1th winding layer, and delta alpha is the curing degree change rate; beta is the complete curing shrinkage of the resin; v r is the resin volume fraction; h is the thickness of the single-layer winding layer; r j is the outer diameter of the liner, and a i is the winding angle of the i-th winding layer.
In specific implementation, if the gas cylinder needs to be in the optimal molding state, the residual tension T i actually obtained through a calculation formula, the residual tension required to be designed for the gas cylinder and the like are T c, the winding tension compensation is performed on the basis of the original winding tension, and the formula for compensating the winding tension T b meets the following requirementsIf the gas cylinder needs to be in other conditions, compensation is carried out according to the actual conditions.
Claims (1)
1. The winding tension adjusting method for the composite material in the gas cylinder is characterized by comprising the following steps of:
1) The plurality of film pressure sensors are coated on the winding layer of the composite material in the gas cylinder according to a preset sensor distribution mode, and each film pressure sensor corresponds to the winding layer coated on the film pressure sensors;
2) Each film pressure sensor collects pressure data, the film pressure sensor corresponding to the winding layer with the same winding angle is used as a group of film pressure sensors, and in each group of film pressure sensors, the pressure of the winding layers of the other layers with the same winding angle as the current group of film pressure sensors is calculated according to the pressure data collected by each group of film pressure sensors, so that the pressure of all the winding layers of the gas cylinder is obtained;
3) Calculating the residual tension of each winding layer of the composite material in the gas cylinder according to the pressure of all the winding layers of the gas cylinder, performing curve fitting on the residual tension of each winding layer to obtain a residual tension curve, and adjusting the winding tension of the composite material in the gas cylinder according to the residual tension curve;
in the 1), a plurality of film pressure sensors are coated on a winding layer of a composite material in a gas cylinder according to a preset sensor distribution mode, and specifically:
In the winding layers of the same winding angle, the first layer and the last winding layer from inside to outside are respectively coated with corresponding film pressure sensors, the winding layers between the first layer and the last winding layer are uniformly coated with film pressure sensors, and the mounting heights of the film pressure sensors are the same and the azimuth angles of the film pressure sensors in the gas cylinders are different;
At least n/5 pressure sensors are arranged in the winding layers between the first layer and the last winding layer, and n is the number of winding layers with the same winding angle;
in the step 2), curve fitting is carried out on the pressure data acquired by each group of film pressure sensors, so that the pressure of the other layers of winding layers with the same winding angle is obtained;
In the 3), the calculation formula of the residual tension of each winding layer of the composite material in the gas cylinder is as follows:
Wherein T i represents the residual tension of the i-th winding layer, P i represents the pressure of the i-th winding layer, P i+1 represents the pressure of the i+1th winding layer, and delta alpha is the curing degree change rate; beta is the complete curing shrinkage of the resin; v r is the resin volume fraction; h is the thickness of the single-layer winding layer; r j is the outer diameter of the liner, and a i is the winding angle of the i-th winding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211118914.9A CN115447175B (en) | 2022-09-13 | 2022-09-13 | Winding tension adjusting method for composite material in gas cylinder |
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|---|---|---|---|
| CN202211118914.9A CN115447175B (en) | 2022-09-13 | 2022-09-13 | Winding tension adjusting method for composite material in gas cylinder |
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| CN115447175A CN115447175A (en) | 2022-12-09 |
| CN115447175B true CN115447175B (en) | 2024-05-24 |
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