Layer-by-layer gradual equal-ratio fiber winding design method and pressure vessel

Abstract

The invention discloses a layer-by-layer gradual equal-ratio fiber winding design method and a pressure container, and relates to the technical field of composite material pressure containers. The design method comprises the steps that S1, strength calculation is conducted firstly, so that the design of the subsequent fiber material winding process is conducted on the premise that the strength requirement is met; s2, calculating the proportion of annular and longitudinal laying layers, and selecting a proper cylinder body laying layer scheme on the premise that the cylinder body strength of a product is met and the equilibrium strength failure condition of the cylinder body of the pressure vessel is met; s3, the circumferential winding doffing thickness and the longitudinal winding doffing thickness of a barrel body of the next planned production equipment are obtained firstly, and then the circumferential winding layer number and the longitudinal winding layer number of the barrel body are calculated; and S4, after the winding angle required by winding, the number of annular winding layers of the cylinder body and the number of longitudinal winding layers of the cylinder body are determined, actual fiber winding is carried out. The qualified rate of the pressure container produced and manufactured through the design method is high.

Description

Technical Field

[0001] The present invention relates to the technical field of composite pressure vessels, and more specifically, to a layer-by-layer progressive equal-ratio fiber winding design method. In addition, the present invention also relates to a pressure vessel using the layer-by-layer progressive equal-ratio fiber winding design method. Background Art

[0002] In order to meet the demand for lightweight high-speed trains, composite materials are widely used in rail vehicles, especially glass fiber and carbon fiber reinforced composite materials. There are many molding processes for composite materials, and fiber winding is one of them. Winding molding is one of the typical high-efficiency and low-cost processes among many composite materials. Fiber winding molding is a process in which continuous fibers (or dry yarns, impregnated yarns, and prepreg tapes, etc.) impregnated with resin are wound layer by layer on the mold surface under a set tension and solidified to obtain composite materials. The production and design process of pressure vessels is relatively immature, and the pass rate is difficult to guarantee.

[0003] In summary, how to improve the qualification rate of pressure vessels with extreme holes is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a layer-by-layer progressive equal-ratio fiber winding design method, and the qualified rate of pressure vessels manufactured using this design method is high.

[0005] Another object of the present invention is to provide a pressure vessel using the above-mentioned layer-by-layer progressive equal-ratio fiber winding design method.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A layer-by-layer progressive equal-ratio filament winding design method, comprising:

[0008] S1: Obtain product burst strength , the tensile strength of the fiber material used for winding , Wall thickness of winding layer of barrel and core mold diameter D, according to the product bursting strength , the tensile strength , the wall thickness of the winding layer of the barrel and the core mold diameter D, calculate the product bursting strength , the tensile strength , the wall thickness of the winding layer of the barrel and the remaining one of the core mold diameter D to determine the achievable product burst strength or select fiber material for winding or determine product size;

[0009] S2: Get the equivalent fiber thickness of the hoop winding layer and the equivalent fiber thickness of the longitudinal winding layer , according to the equivalent fiber thickness of the hoop winding layer , the wall thickness of the winding layer of the barrel and the equivalent fiber thickness of the longitudinal winding layer , calculate the ring-to-longitudinal ply ratio , the ring longitudinal ply ratio The ratio of the hoop winding layer of the barrel The longitudinal spiral ply ratio with the barrel The ratio between

[0010] In order to meet the balanced strength failure conditions of the pressure vessel shell Under the premise of , and according to the spiral winding angle of the barrel Calculate and determine the ring longitudinal ply ratio ;

[0011] S3: Obtain the thickness of the hoop-wound yarn on the tube and the longitudinal winding yarn thickness of the tube According to the core mold diameter D and the winding layer thickness of the barrel , the thickness of the hoop-wound yarn of the tube , the longitudinal winding yarn thickness of the tube body , the ratio of the hoop winding layer of the barrel and the longitudinal spiral ply ratio of the barrel , calculate the number of circumferential winding layers of the barrel And the longitudinal winding layers of the barrel ;

[0012] S4: According to the spiral winding angle of the barrel , the number of circumferential winding layers of the barrel , the number of longitudinal winding layers of the barrel , and perform fiber winding operations.

[0013] Preferably, the calculation of the bursting strength of the product , the tensile strength , the wall thickness of the winding layer of the barrel and the remaining one of the core mold diameter D, including:

[0014] S21: First, according to the wall thickness of the winding layer of the barrel and the core diameter D to calculate the thickness-to-diameter ratio , the aspect ratio for ;

[0015] S22: According to the bursting strength of the product and the aspect ratio , deriving the tensile strength The calculation formula is ;

[0016] Or, according to the tensile strength and the aspect ratio , derive the burst strength of the product The calculation formula is ;

[0017] Or, according to the burst strength of the product And the tensile strength , derive the aspect ratio The calculation formula is .

[0018] Preferably, the ring longitudinal ply ratio The calculation method is:

[0019] .

[0020] Preferably, the ratio of the hoop winding layer of the barrel is The calculation method is ; and the number of circumferential winding layers of the barrel The calculation method is ;

[0021] The longitudinal spiral ply ratio of the barrel The calculation method is ; and the number of longitudinal winding layers of the barrel The calculation method is .

[0022] Preferably, the spiral winding angle of the barrel is selected ,include:

[0023] According to the single angle ring longitudinal balance equation, the spiral winding angle of the barrel is determined It is 54.7°.

[0024] Preferably, S3 further includes:

[0025] Get the pole hole diameter , and according to the pole hole diameter and the core mold diameter D, calculate the core mold spiral angle , the core winding angle The calculation method is ;

[0026] The number of balanced strength doffing points a is obtained, and a number of balanced strength doffing points are obtained uniformly along the axial direction of the core mold end section and in sequence from large to small according to the number of balanced strength doffing points , where a=1, 2, 3…m, and the balanced strength doffing point is the polar hole position;

[0027] According to the balanced strength doffing point Determine a spiral winding process, the spiral winding process includes a step b spiral winding process , where b = 1, 2, 3 ... n, and several of the spiral winding steps Drop yarn at The balanced strength doffing point ;

[0028] Calculate several of the spiral winding steps Hole diameter and helix angle , and the expansion hole diameter The calculation method is , the helix angle The calculation method is ;

[0029] And calculate each of the spiral winding steps The balanced strength doffing points Doffing diameter and doffing angle , and the yarn drop diameter The calculation method is , the yarn dropping angle The calculation method is ;

[0030] According to the yarn dropping angle , the helical angle and the longitudinal winding yarn thickness of the tube body , calculate the yarn thickness at the equilibrium strength yarn drop point , and the yarn thickness The calculation method is , and balanced strength doffing point Thickness of yarn dropped Equal to the equilibrium strength doffing point Thickness of yarn dropped .

[0031] Preferably, .

[0032] Preferably, the S3 further includes:

[0033] Calculate several of the spiral winding steps The ring strength component of the cylinder , the ring strength component of the barrel The calculation method is ; Then calculate each of the spiral winding steps The balanced strength doffing points Circumferential blasting component , the annular blasting component The calculation method is , and balanced strength doffing point Circumferential blasting component ; Then according to the annular blasting component Calculate several balanced strength doffing points The total amount of circumferential blasting , and the annular blasting total The calculation method is ;

[0034] Calculate several of the spiral winding steps The longitudinal strength of the barrel , the longitudinal strength component of the barrel The calculation method is ; Then calculate each of the spiral winding steps The balanced strength doffing points Axial burst component , the axial burst component The calculation method is , and balanced strength doffing point Axial burst component ; Then according to the axial burst component Calculate several balanced strength doffing points The axial bursting amount , and the axial burst total The calculation method is ;

[0035] if ,and , then the equilibrium strength doffing points Only one time is required Process ;

[0036] if ,and , then the equilibrium strength doffing points The z-th spiral winding process is required ,in, .

[0037] Preferably, the tensile strength The calculation method is:

[0038] ;

[0039] in, Refers to the average strength of each yarn ribbon; Refers to the number of hoop winding layers; It refers to the number of strips wound around a unit length; Refers to the thickness of the hoop winding layer.

[0040] A pressure vessel adopts the above-mentioned layer-by-layer progressive equal-ratio fiber winding design method.

[0041] The layer-by-layer progressive geometric fiber winding design method provided by the present invention performs strength calculation in step S1, so that the design of the subsequent fiber material winding process is carried out under the premise of meeting the strength requirements; in step S2, in order to meet the strength of the product barrel, the balanced strength failure condition of the pressure vessel barrel is met. Under the premise of selecting a suitable barrel layering scheme; in step S3, the hoop winding yarn thickness of the barrel of the equipment planned for production is obtained. and the longitudinal winding yarn thickness of the tube , and then calculate the number of circumferential winding layers of the barrel And the longitudinal winding layers of the barrel , in order to lay the foundation for the actual fiber winding; through step S4, after determining the winding angle required for winding, the number of circumferential winding layers of the tube body And the longitudinal winding layers of the barrel Afterwards, the actual filament winding takes place.

[0042] This design method first performs strength calculations and then designs a fiber winding solution based on the strength calculations. The qualified rate of products produced using this design method is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 A flow chart of a design method for a specific embodiment of the present invention;

[0045] Figure 2A schematic diagram of the ring-to-longitudinal ply ratio-spiral winding angle of a specific embodiment provided by the present invention;

[0046] Figure 3 A schematic diagram of spiral winding according to a specific embodiment of the present invention;

[0047] Figure 4 A schematic diagram of the diameter of the expanded hole according to a specific embodiment of the present invention;

[0048] Figure 5 A schematic diagram of a layer-by-layer progressive hole expansion scheme according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The core of the present invention is to provide a layer-by-layer progressive geometric fiber winding design method, and the qualified rate of pressure vessels manufactured by using the design method is high. Another core of the present invention is to provide a pressure vessel using the above-mentioned layer-by-layer progressive geometric fiber winding design method.

[0051] Please refer to Figure 1 The present invention provides a layer-by-layer progressive proportional fiber winding design method, comprising the following steps:

[0052] Step S1: Obtain product bursting strength , the tensile strength of the fiber material used for winding , Wall thickness of winding layer of barrel and core mold diameter D, according to the product bursting strength , tensile strength , Wall thickness of winding layer of barrel and core mold diameter D, calculate the product bursting strength , tensile strength , Wall thickness of winding layer of barrel The remaining one of the core mold diameter D is used to determine the achievable product burst strength. Or select the fiber material for winding or determine the size of the product; it is understood that before designing the fiber material winding process, calculations are performed to determine the product burst strength that can be achieved by the planned winding fiber material and the pre-designed product size. , or, using the product burst strength Select the winding fiber material that meets the strength requirements based on the pre-designed product size, or determine the planned winding fiber material and product burst strength through calculation. Determine the size of the pressure vessel. In summary, step S1 is to perform strength calculation so that the design of the subsequent fiber material winding process is carried out under the premise of meeting the strength requirements.

[0053] Step S2: Obtaining the equivalent fiber thickness of the hoop winding layer and the equivalent fiber thickness of the longitudinal winding layer , according to the equivalent fiber thickness of the hoop winding layer , Wall thickness of winding layer of barrel and the equivalent fiber thickness of the longitudinal winding layer , calculate the ring-to-longitudinal ply ratio , ring longitudinal ply ratio The ratio of the hoop winding layer of the barrel The longitudinal spiral ply ratio with the barrel The ratio between the ring and longitudinal plies is calculated first. , which lays the foundation for the subsequent selection and determination of winding angle and ply ratio.

[0054] In order to meet the balanced strength failure conditions of the pressure vessel shell Under the premise of , and according to the spiral winding angle of the barrel Calculate and determine the ratio of ring and longitudinal plies It is understandable that in order to ensure that the product's barrel strength is met, the balanced strength failure condition of the pressure vessel barrel is met. Under the premise of selection, select the appropriate barrel laying plan.

[0055] Step S3: Obtaining the thickness of the hoop-wound yarn of the tube and the longitudinal winding yarn thickness of the tube , according to the core mold diameter D, the winding layer thickness of the barrel , the thickness of the hoop winding yarn of the tube , the longitudinal winding yarn thickness of the tube , the ratio of the hoop winding layer of the barrel The longitudinal spiral ply ratio of the barrel , calculate the number of circumferential winding layers of the barrel And the longitudinal winding layers of the barrel It is understandable that the thickness of the hoop winding yarn of the tube body of the next planned production equipment is obtained. and the longitudinal winding yarn thickness of the tube , and then calculate the number of circumferential winding layers of the barrel And the longitudinal winding layers of the barrel , to lay the foundation for practical fiber winding.

[0056] Step S4: According to the spiral winding angle of the barrel , the number of circumferential winding layers of the barrel , the number of longitudinal winding layers of the barrel , perform fiber winding operation; it is understandable that in determining the winding angle required for winding, the number of circumferential winding layers of the barrel And the longitudinal winding layers of the barrel Afterwards, the actual filament winding takes place.

[0057] In summary, this design method first performs strength calculations and then designs a fiber winding scheme based on the strength calculations. The qualified rate of products produced using this design method is relatively high.

[0058] Based on the above embodiment, the product bursting strength is calculated , tensile strength , Wall thickness of winding layer of barrel and the remaining one of the core mold diameter D, including:

[0059] Step S21: First, according to the wall thickness of the winding layer of the barrel Calculate the thickness-to-diameter ratio using the core mold diameter D , thickness-diameter ratio for ;

[0060] Step S22: According to the bursting strength of the product and thickness to diameter ratio , derive the tensile strength The calculation formula is ;

[0061] Or, based on tensile strength and thickness to diameter ratio , derive the product burst strength The calculation formula is ;

[0062] Or, according to the product burst strength and tensile strength , derive the thickness-to-diameter ratio The calculation formula is .

[0063] According to the grid strength design theory of thin-walled pressure vessel parts, the axial static equilibrium equation can be derived as follows:

[0064] ;

[0065] in, is the product bursting pressure; is the longitudinal bursting pressure component of the spirally wound layer of the product; is the equivalent fiber thickness of the longitudinal winding layer; Provides tensile strength for winding fiber materials; is the longitudinal spiral winding angle, D is the core mold diameter;

[0066] The annular static equilibrium equation can also be derived as:

[0067] ;

[0068] in, It is the annular explosion pressure component of the spirally wound layer of the product; is the annular bursting pressure component of the annular winding layer of the product, is the equivalent fiber thickness of the hoop winding layer.

[0069] Furthermore, using the above axial static equilibrium equation and annular static equilibrium equation, the equivalent fiber thickness of the longitudinal winding layer can be derived: The calculation formula is , and the equivalent fiber thickness of the hoop winding layer can be derived The calculation formula is .

[0070] Furthermore, using the equivalent fiber thickness of the longitudinal winding layer and the equivalent fiber thickness of the hoop winding layer The calculation formula can be used to deduce the wall thickness of the winding layer of the barrel. The calculation formula is .

[0071] This embodiment introduces the aspect ratio This parameter, specifically, the thickness-to-diameter ratio Refers to the wall thickness of the winding layer of the barrel The ratio of the core diameter D is , the product explosion pressure can be determined , thickness-diameter ratio The tensile strength of the fiber material used for winding The relationship between these three parameters is In this embodiment, by using the aspect ratio This parameter simplifies the formula to reduce the difficulty and complexity of the calculation.

[0072] On the basis of the above embodiment, the ring longitudinal ply ratio The calculation method is: .

[0073] Based on the introduction of the aspect ratio After this parameter, the equivalent fiber thickness of the hoop winding layer is used , Wall thickness of winding layer of barrel , the ratio of the hoop winding layer of the barrel can be deduced The calculation formula is ; Using the equivalent fiber thickness of the longitudinal winding layer The wall thickness of the winding layer of the barrel , the longitudinal spiral ply ratio of the barrel can be deduced The calculation formula is .

[0074] Furthermore, the ratio of the hoop winding layer of the barrel is used. The longitudinal spiral ply ratio of the barrel The calculation formula of the ring-to-vertical ply ratio can be derived The calculation formula is as follows: ; To ensure the balanced strength of the pressure vessel body, it is necessary , then the spiral winding angle of the barrel is required for the fiber winding of the barrel , and then the spiral winding angle of the pressure vessel body that meets the balanced strength failure condition can be selected , using the selected barrel spiral winding angle The ratio of the ring and longitudinal layers can be calculated .

[0075] For example, select the spiral winding angle of the barrel is 54.7°, then 0, then the barrel layup scheme can be determined as follows: only longitudinal spiral winding with a winding angle of 54.7° is performed on the barrel; or, the barrel spiral winding angle is selected is 0°, then 2, the barrel laying scheme can be determined as follows: at the barrel, every two circumferential winding layers with a winding angle of 90° are wound, that is, one longitudinal winding layer with a winding angle of 0° is wound. Of course, the barrel laying scheme is not limited to the above example scheme, as long as it satisfies This condition is sufficient.

[0076] On the basis of the above embodiment, the ratio of the hoop winding layer of the barrel is The calculation method is ; and the number of circumferential winding layers of the barrel The calculation method is ;

[0077] Longitudinal spiral ply ratio of barrel The calculation method is ; and the number of longitudinal winding layers of the tube The calculation method is .

[0078] Based on the introduction of the aspect ratio After this parameter is designed, there is no need to determine the wall thickness of the winding layer of the barrel in step S1. And the core mold diameter D, as long as the ratio of the two is equal, that is, the thickness-to-diameter ratio If a series of equal pressure vessels meet the strength requirements after calculation in step S1, the spiral winding angle of the barrel can be adjusted in step S2. The choice of the ring and longitudinal ply ratio can be , the ratio of the hoop winding layer of the barrel The longitudinal spiral ply ratio of the barrel Calculation.

[0079] In this embodiment, the number of layers of different types of winding layers is calculated and confirmed for the actual core mold diameter D during a certain production. Specifically, the ratio of the circumferential winding layer of the barrel is The longitudinal spiral ply ratio of the barrel Substitute them into the corresponding formulas respectively, combine the core mold diameter D, and the thickness-to-diameter ratio calculated in step S1 , the hoop winding yarn thickness of the barrel of the planned production equipment obtained in step S3 and the longitudinal winding yarn thickness of the tube , the number of circumferential winding layers of the barrel can be calculated And the longitudinal winding layers of the barrel .

[0080] On the basis of the above embodiment, the spiral winding angle of the barrel is selected ,include:

[0081] According to the single angle ring longitudinal balance equation, determine the spiral winding angle of the barrel It is 54.7°.

[0082] Utilize the longitudinal blasting pressure component of the spirally wound layer of the above product and the annular blasting pressure component of the spirally wound layer of the product The calculation formula of the single angle ring can be derived from the longitudinal equilibrium equation for , the spiral winding angle can be determined , then the spiral winding angle is used The circumferential blasting pressure component and longitudinal blasting pressure component of each ply meet the product blasting strength , there is no need to increase the hoop winding layer, which lays the foundation for obtaining the thinnest fiber winding layer thickness.

[0083] On the basis of the above embodiment, step S3 further includes:

[0084] Obtain the diameter of the polar hole , and calculate the core mold spiral angle according to the diameter of the polar hole and the diameter D of the core mold. The calculation method of the core mold winding angle is as follows ; It can be understood that, according to the diameter of the polar hole and the barrel body spiral winding angle , calculate the core mold winding angle for subsequent calculations .

[0085] Obtain the number a of the equal-strength doffing points, and successively obtain a number of equal-strength doffing points along the axial direction and from large to small according to the number of the equal-strength doffing points on the core mold head section , where a = 1, 2, 3... m, and the equal-strength doffing point is the position of the polar hole; It can be understood that, first obtain the number a of the equal-strength doffing points, where a≥3, and then, according to the number a of the equal-strength doffing points, successively select the equal-strength doffing points along the axial direction on the core mold head section , equal-strength doffing point ,... equal-strength doffing point , where the equal-strength doffing point refers to the position of the polar hole, and the equal-strength doffing point refers to the position of the core mold shoulder to define the arrangement order of a equal-strength doffing points .

[0086] Determine the spiral winding process according to a number of equal-strength doffing points . The spiral winding process includes b steps of spiral winding operations , where b = 1, 2, 3... n, and a number of spiral winding operations doff on the equal-strength doffing points ; It can be understood that, based on a number of equal-strength doffing points , plan the spiral winding process. Specifically, the spiral winding process includes b steps of spiral winding operations , and b≤a. Among them, the first step of the spiral winding operation doffs on all the equal-strength doffing points from the equal-strength doffing point to the equal-strength doffing point . When b = a, the b-th step of the spiral winding operation only doffs on the equal-strength doffing point . When b < a, the b-th step of the spiral winding operation doffs on the equal-strength doffing points from the equal-strength doffing point to the equal-strength doffing point , and the second step of spiral winding process To step b-1 spiral winding process All yarns are dropped at their equilibrium strength drop point The position of the subscript is larger than its own subscript. For example, in some embodiments, the fourth step of the spiral winding process Yarn doffing at the balanced strength doffing point , Balanced Strength Doffing Point , Balanced Strength Doffing Point To the balanced strength doffing point .

[0087] Calculation of several spiral winding steps Hole diameter and helix angle , and the expansion diameter The calculation method is , helical angle The calculation method is ; It is understandable that the diameter of the hole expanded in each process is calculated and helix angle , in order to facilitate subsequent calculations, and when calculating the hole expansion, the previous spiral winding process Balanced strength doffing point For the next spiral winding process The diameter of the hole is expanded, and the subsequent spiral expansion process of the subsequent layer-by-layer progressive proportional expansion is implemented iteratively. The hole expansion ratio is ,Right now , Compared with the related technology of using layer-by-layer equal-difference hole expansion in the core mold head section, the method of layer-by-layer progressive equal-ratio hole expansion can effectively reduce the degree of fiber accumulation while ensuring the structural strength of the head winding area, and adopt The hole expansion ratio effectively reduces the calculation difficulty.

[0088] And calculate each spiral winding process Several balanced strength doffing points Doffing diameter and doffing angle , and the yarn diameter The calculation method is , yarn drop angle The calculation method is It is understandable that the corresponding balanced strength doffing point in each process is determined Doffing diameter and doffing angle , in preparation for winding operation, so set up, at the same balanced strength doffing point Each step of the spiral winding process is carried out in the position Hourly doffing diameter Equal, adjacent spiral winding process Middle adjacent balanced strength doffing point The yarn drop angle equal.

[0089] According to the yarn dropping angle , Helix Angle and the longitudinal winding yarn thickness of the tube , calculate the yarn thickness at the balanced strength yarn drop point , and the yarn thickness The calculation method is , and balanced strength doffing point Thickness of yarn dropped Equal to the equilibrium strength doffing point Thickness of yarn dropped It is understandable that the corresponding balanced strength doffing point in each process is determined Thickness of yarn dropped , in preparation for the winding operation; in particular, when m=n, the nth step of the spiral winding process Thickness of yarn dropped Equal to the equilibrium strength doffing point Thickness of yarn dropped .

[0090] Based on the above embodiments, , in order to further simplify the calculation difficulty.

[0091] Of course, when the core mold head section realizes the gradual and proportional hole expansion layer by layer, the adjacent spiral winding process Hole expansion ratio Not limited to , as long as the gradual and proportional hole expansion can be achieved layer by layer.

[0092] For example, in some embodiments, the core mold diameter , Pole hole diameter , the longitudinal winding yarn thickness of the tube , the number of balanced strength doffing points , spiral winding process The number of processes b = 6, and the core winding angle .

[0093] Based on the above basic parameters, the first step of the winding process is the spiral winding process. The following table shows the calculation of several parameters through the above formula:

[0094]

[0095] The second step is spiral winding process The following table shows the calculation of several parameters through the above formula:

[0096]

[0097] Step 3 Spiral Winding Process The following table shows the calculation of several parameters through the above formula:

[0098]

[0099] Step 4: Spiral winding process The following table shows the calculation of several parameters through the above formula:

[0100]

[0101] Step 5: Spiral winding process The following table shows the calculation of several parameters through the above formula:

[0102]

[0103] Step 6: Spiral winding process The following table shows the calculation of several parameters through the above formula:

[0104]

[0105] In this embodiment, , , so as to realize the gradual and proportional hole expansion layer by layer in the core mold head section; and at the same balanced strength doffing point Each step of the spiral winding process is carried out in the position Hourly doffing diameter Equal, adjacent spiral winding process Middle adjacent balanced strength doffing point The yarn drop angle equal.

[0106] On the basis of the above embodiment, step S3 further includes:

[0107] Calculation of several spiral winding steps The ring strength component of the cylinder , the ring strength of the cylinder The calculation method is ; Then calculate each spiral winding process Several balanced strength doffing points Circumferential blasting component , circumferential blasting component The calculation method is , and balanced strength doffing point Circumferential blasting component ; Then according to the annular blasting component Calculate several balanced strength drop points The total amount of circumferential blasting , and the total amount of circumferential blasting The calculation method is ;.

[0108] It is understandable that several spiral winding steps are calculated first The ring strength component of the cylinder For example, the first step of the spiral winding process The ring strength component of the cylinder , the second step of spiral winding process The ring strength component of the cylinder .

[0109] Further, the strength of the cylinder ring Calculate each spiral winding process Several balanced strength doffing points Circumferential blasting component For example, the first step of the spiral winding process Balanced strength doffing point during winding Circumferential blasting component , Balanced Strength Doffing Point Circumferential blasting component Wait, the second step of spiral winding process Balanced strength doffing point during winding Circumferential blasting component , Balanced Strength Doffing Point Circumferential blasting component etc.; in particular, when m=n, the nth spiral winding process Circumferential blasting component For example, the first step of the spiral winding process Balanced strength doffing point during winding Circumferential blasting component , the second step of spiral winding process Balanced strength doffing point during winding Circumferential blasting component wait.

[0110] Furthermore, by each spiral winding process Balanced strength yarn drop points Circumferential blasting component , calculate the balanced strength drop points The total amount of circumferential blasting , Circumferential blasting total Refers to the same balanced strength doffing point In each spiral winding process Circumferential blasting component The sum of, for example, the equilibrium strength doffing point The total amount of circumferential blasting .

[0111] Calculation of several spiral winding steps The longitudinal strength of the barrel , longitudinal strength of barrel The calculation method is ; Then calculate each spiral winding process Several balanced strength doffing points Axial burst component , axial burst component The calculation method is , and balanced strength doffing point Axial burst component ; Then according to the axial burst component Calculate several balanced strength drop points The axial bursting amount , and the axial burst total The calculation method is .

[0112] It is understandable that several spiral winding steps are calculated first The longitudinal strength of the barrel For example, the first step of the spiral winding process The longitudinal strength of the barrel , the second step of spiral winding process The longitudinal strength of the barrel .

[0113] Furthermore, by using the longitudinal strength of the barrel Calculate each spiral winding process Several balanced strength doffing points Axial burst component For example, the first step of the spiral winding process Balanced strength doffing point during winding Axial burst component , Balanced Strength Doffing Point Axial burst component Wait, the second step of spiral winding process Balanced strength doffing point during winding Axial burst component , Balanced Strength Doffing Point Axial burst component etc.; in particular, when m=n, the nth spiral winding process Axial burst component For example, the first step of the spiral winding process Balanced strength doffing point during winding Axial burst component , the second step of spiral winding process Balanced strength doffing point during winding Axial burst component wait.

[0114] Furthermore, by each spiral winding process Balanced strength yarn drop points Axial burst component , calculate the balanced strength drop points The axial bursting amount , axial burst total Refers to the same balanced strength doffing point In each spiral winding process The axial burst component The sum of, for example, the equilibrium strength doffing point The axial bursting amount .

[0115] if ,and , then several equilibrium strength drop points Only one time is required Process ;if ,and , then several equilibrium strength drop points The z-th spiral winding process is required ,in, .

[0116] It can be understood that for each balanced strength doffing point The axial bursting amount And product bursting pressure For comparison, if each spiral winding process Balanced strength doffing point when only one operation is performed The axial bursting amount Greater than or equal to the product bursting pressure , then the product light requirements are met; and if each spiral winding process Balanced strength doffing point when only one operation is performed The axial bursting amount Less than product bursting pressure , then the balanced strength drop point needs to be Strengthen by adding z spiral winding processes ,in ,Right now Divide by The quotient is rounded up to determine the spiral winding process The number of plies; for example, the balanced strength drop point The axial bursting amount Less than product bursting pressure , you need to increase Spiral winding process ,if , 2 more spiral winding processes are required , that is, the spiral winding process includes 3 spiral winding steps .

[0117] Based on the above embodiments, the tensile strength The calculation method is:

[0118] ;

[0119] in, Refers to the average strength of each yarn ribbon; Refers to the number of hoop winding layers; It refers to the number of strips wound around a unit length; Refers to the thickness of the hoop winding layer.

[0120] It is understandable that a more accurate tensile strength can be calculated based on the basic performance parameters of fiber materials prepared by different processes or equipment. To further ensure the tensile strength The reliability of subsequent calculation results.

[0121] In addition to the above-mentioned layer-by-layer progressive geometric fiber winding design method, the present invention also provides a pressure vessel using the layer-by-layer progressive geometric fiber winding design method disclosed in the above-mentioned embodiment. For the structures of other parts of the pressure vessel, please refer to the prior art and will not be described in detail herein.

[0122] It should be noted that the relational terms such as "first" and "second" mentioned above are merely used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between these entities; the "upper surface, lower surface, top, bottom" and the directional words "upper, lower, left, right" mentioned above are all defined based on the drawings in the specification.

[0123] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0124] The above is a detailed introduction to the layer-by-layer progressive proportional fiber winding design method and pressure vessel provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A layer-by-layer progressive proportional fiber winding design method, characterized in that: include: S1: Obtain product burst strength , the tensile strength of the fiber material used for winding , Wall thickness of winding layer of barrel and core mold diameter D, according to the product bursting strength , the tensile strength , the wall thickness of the winding layer of the barrel and the core mold diameter D, calculate the product bursting strength , the tensile strength , the wall thickness of the winding layer of the barrel and the remaining one of the core mold diameter D to determine the achievable product burst strength or select the fiber material for winding or determine the size of the product; S2: Get the equivalent fiber thickness of the hoop winding layer and the equivalent fiber thickness of the longitudinal winding layer , according to the equivalent fiber thickness of the hoop winding layer , the wall thickness of the winding layer of the barrel and the equivalent fiber thickness of the longitudinal winding layer , calculate the ring-to-longitudinal ply ratio , the ring longitudinal ply ratio The ratio of the hoop winding layer of the barrel The longitudinal spiral ply ratio with the barrel The ratio between In order to meet the balanced strength failure conditions of the pressure vessel shell Under the premise of , and according to the spiral winding angle of the barrel Calculate and determine the ring longitudinal ply ratio ; S3: Obtain the thickness of the hoop-wound yarn on the tube and the longitudinal winding yarn thickness of the tube According to the core mold diameter D and the winding layer thickness of the barrel , the thickness of the hoop-wound yarn of the tube , the longitudinal winding yarn thickness of the tube body , the ratio of the hoop winding layer of the barrel and the longitudinal spiral ply ratio of the barrel , calculate the number of circumferential winding layers of the barrel And the number of longitudinal winding layers of the barrel ; S4: According to the spiral winding angle of the barrel , the number of circumferential winding layers of the barrel , the number of longitudinal winding layers of the barrel , and perform fiber winding operations.

2. The layer-by-layer progressive geometric fiber winding design method according to claim 1 is characterized in that: Calculating the bursting strength of the product , the tensile strength , the wall thickness of the winding layer of the barrel and the remaining one of the core mold diameter D, including: S21: First, according to the wall thickness of the winding layer of the barrel and the core mold diameter D to calculate the thickness-to-diameter ratio , the aspect ratio for ; S22: According to the bursting strength of the product and the aspect ratio , deriving the tensile strength The calculation formula is ; Or, according to the tensile strength and the aspect ratio , derive the burst strength of the product The calculation formula is ; Or, according to the burst strength of the product And the tensile strength , derive the aspect ratio The calculation formula is .

3. The layer-by-layer progressive geometric fiber winding design method according to claim 2 is characterized in that: The ring longitudinal ply ratio The calculation method is: 。 4. The layer-by-layer progressive geometric fiber winding design method according to claim 2 is characterized in that: The hoop winding layer ratio of the barrel The calculation method is ; and the number of circumferential winding layers of the barrel The calculation method is ; The longitudinal spiral ply ratio of the barrel The calculation method is ; and the number of longitudinal winding layers of the barrel The calculation method is .

5. The layer-by-layer progressive geometric fiber winding design method according to any one of claims 1 to 4, characterized in that: The spiral winding angle of the barrel is selected ,include: According to the single angle ring longitudinal balance equation, the spiral winding angle of the barrel is determined It is 54.7°.

6. The layer-by-layer progressive geometric fiber winding design method according to claim 5, characterized in that: The S3 further includes: Get the pole hole diameter , and according to the pole hole diameter and the core mold diameter D, calculate the core mold spiral angle , the core winding angle The calculation method is ; The number of balanced strength doffing points a is obtained, and a number of balanced strength doffing points are obtained uniformly along the axial direction of the core mold end section and in sequence from large to small according to the number of balanced strength doffing points , where a=1, 2, 3…m, and the balanced strength doffing point is the polar hole position; According to the balanced strength doffing point Determine a spiral winding process, the spiral winding process includes a step b spiral winding process , where b = 1, 2, 3 ... n, and several of the spiral winding steps Drop yarn at The balanced strength doffing point ; Calculate several of the spiral winding steps Hole diameter and helix angle , and the expansion hole diameter The calculation method is , the helix angle The calculation method is ; And calculate each of the spiral winding steps Some of the balanced strength doffing points Doffing diameter and doffing angle , and the yarn drop diameter The calculation method is , the yarn dropping angle The calculation method is ; According to the yarn dropping angle , the helical angle and the longitudinal winding yarn thickness of the tube body , calculate the yarn thickness at the equilibrium strength yarn drop point , and the yarn thickness The calculation method is , and balanced strength doffing point Thickness of yarn dropped Equal to the equilibrium strength doffing point Thickness of yarn dropped .

7. The layer-by-layer progressive geometric fiber winding design method according to claim 6, characterized in that: 。 8. The layer-by-layer progressive geometric fiber winding design method according to claim 6, characterized in that: The S3 further includes: Calculate several of the spiral winding steps The ring strength component of the cylinder , the ring strength component of the barrel The calculation method is ; Then calculate each of the spiral winding steps The balanced strength doffing points Circumferential blasting component , the annular blasting component The calculation method is , and balanced strength doffing point Circumferential blasting component ; Then according to the annular blasting component Calculate several balanced strength doffing points The total amount of circumferential blasting , and the annular blasting total The calculation method is ; Calculate several of the spiral winding steps The longitudinal strength of the barrel , the longitudinal strength component of the barrel The calculation method is ; Then calculate each of the spiral winding steps Some of the balanced strength doffing points Axial burst component , the axial burst component The calculation method is , and balanced strength doffing point Axial burst component ; Then according to the axial burst component Calculate several balanced strength drop points The axial bursting force , and the axial burst total The calculation method is ; if ,and , then the equilibrium strength doffing points Only one time is required Process ; if ,and , then the equilibrium strength doffing points The z-th spiral winding process is required ,in, .

9. The layer-by-layer progressive geometric fiber winding design method according to any one of claims 1 to 7, characterized in that: The tensile strength The calculation method is: ； in, Refers to the average strength of each yarn ribbon; Refers to the number of hoop winding layers; It refers to the number of strips wound around a unit length; Refers to the thickness of the hoop winding layer.

10. A pressure vessel, characterized in that: The layer-by-layer progressive proportional fiber winding design method described in any one of claims 1 to 7 is applied.

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