Design method of impact-resistant lightweight composite hydrogen storage cylinder

Abstract

The application relates to the technical field of composite material pressure containers, and discloses a design method of an anti-impact lightweight composite hydrogen storage cylinder, which comprises the following steps: step one, determining the design requirements of the hydrogen storage cylinder and the impact kinetic energy to be borne; step two, preliminarily designing the structure size of the hydrogen storage cylinder; step three, calculating the residual strength S of the hydrogen storage cylinder according to the wall thickness damage h; and step four, judging the anti-impact safety performance according to the residual strength S: if S is less than 0.7, it is judged that the anti-impact strength is insufficient, and the fiber winding layer laying scheme is returned to be adjusted; if S is greater than or equal to 0.9, it is judged that the strength is redundant, and the thickness of the fiber winding layer is returned to be reduced; and if 0.7 is less than S and S is less than 0.9, it is judged that the design requirements are met. The above method does not need to construct a complex finite element model, and the implementation difficulty and learning cost are reduced; meanwhile, the residual strength of the cylinder can be reasonably calculated in the design stage, the material is prevented from being excessively redundant under the premise of guaranteeing the anti-impact safety performance of the cylinder, and the lightweight of the hydrogen storage cylinder is realized.

Description

Technical Field

[0001] This invention relates to the field of composite material pressure vessel technology, and in particular to a design method for an impact-resistant, lightweight composite material hydrogen storage cylinder. Background Technology

[0002] With the rapid development of the hydrogen energy industry, high-pressure gaseous hydrogen storage has become the mainstream on-board hydrogen storage method for hydrogen fuel cell vehicles. Type III (metal-lined, fully fiber-wound) and Type IV (plastic-lined, fully fiber-wound) composite hydrogen storage cylinders are widely used due to their high hydrogen storage density and lightweight advantages. During service, hydrogen storage cylinders may be subjected to impacts from the external environment or accidents, such as direct impacts from debris, bullets, etc. Current impact-resistant designs for hydrogen storage cylinders mainly follow existing standards such as GB / T 35544, GB / T 42612, or ISO 11119, and their technical approach often adopts an iterative model of "preliminary design - destructive testing - empirical correction." Designers determine the fiber winding thickness based on the cylinder's nominal working pressure by setting a safety factor, and then verify the residual burst pressure after damage through physical tests such as gunshot tests and drop tests. This method cannot quantify the remaining strength of the cylinder during the design phase, often resulting in excessive redundancy in the fiber winding layer.

[0003] Currently, methods for assessing the damage and safety of composite hydrogen storage cylinders under impact loads have also been developed. These methods establish a finite element model of the composite hydrogen storage cylinder under impact, calculate the cylinder's deformation parameters under burst pressure, and perform curve fitting on the impact energy, cylinder deformation parameters, and residual burst pressure data to form empirical formulas. However, these empirical formulas lack theoretical support from mechanics, and often become invalid if the cylinder's material or structural parameters change, resulting in poor universality. These finite element simulation-based methods have high requirements for material constitutive and failure parameters, high computational costs, and drawbacks such as high implementation difficulty, difficulty in model verification, difficulty for engineers to understand, and high learning costs. Summary of the Invention

[0004] To address the problems of excessive redundancy in fiber winding layers due to static strength criteria and fixed safety factors in current technical standards, and the over-reliance on finite element simulation, high computational costs, and lack of clear mechanical theoretical support in existing impact damage assessment methods, this invention proposes a design method for impact-resistant, lightweight composite hydrogen storage cylinders. This method eliminates the need for complex finite element models, avoids dependence on material constitutive and failure parameters and cumbersome data curve fitting, reduces implementation difficulty and learning costs, and facilitates understanding and application by engineers. Furthermore, this method can reasonably calculate and quantify the residual strength of cylinders of different specifications during the design phase, effectively avoiding excessive material redundancy while ensuring the impact resistance and safety performance of the cylinders, thereby achieving lightweight composite hydrogen storage cylinders.

[0005] This invention provides a design method for an impact-resistant, lightweight composite material hydrogen storage cylinder, comprising:

[0006] Step 1: Determine the design requirements of the hydrogen storage cylinder and the magnitude of the impact kinetic energy it needs to withstand;

[0007] Step 2: Conduct preliminary design of the hydrogen storage cylinder structure dimensions, determine the inner liner structure dimensions and the laying scheme of the outer fiber winding layer; and check the load-bearing strength of the preliminary hydrogen storage cylinder design: if it fails, redesign the laying scheme; if it passes, proceed to Step 3;

[0008] Step 3: Calculate the wall thickness damage h of the hydrogen storage cylinder under the impact of the projectile with initial kinetic energy E0 along the wall thickness direction, and determine the remaining strength S of the hydrogen storage cylinder based on the wall thickness damage h.

[0009] The wall thickness damage amount h is solved by the following equation:

[0010] ;

[0011] in, For the mass of the projectile; The projectile's impact velocity; The structural stiffness coefficient; This is the contact stiffness coefficient; The equivalent modulus of the fiber winding layer; ; R is the thickness of the fiber winding layer; R is the radius of the mid-surface of the fiber winding layer. Poisson's ratio in the thickness direction of the fiber winding layer; Where is the radius of the projectile; The Poisson's ratio of the projectile; The elastic modulus of the projectile;

[0012] The formula for calculating the residual strength S is as follows:

[0013] ;

[0014] Where k is the ply fracture coefficient, δ is the fiber winding thickness, and h is the wall thickness damage.

[0015] Step 4: Determine the impact resistance safety performance of the hydrogen storage cylinder based on the residual strength S calculated in Step 3:

[0016] If S < 0.7, it is determined that the impact resistance is insufficient, and the process returns to step two to adjust the fiber winding layer laying scheme.

[0017] If S≥0.9, it is determined to be strength redundancy, and we return to step two to reduce the thickness of the fiber winding layer to achieve lightweighting;

[0018] If 0.7 ≤ S < 0.9, it is determined that the design requirements are met.

[0019] In some embodiments, the design requirements for the hydrogen storage cylinder in step one include the working conditions, usage requirements, and main technical parameters of the hydrogen storage cylinder; the main technical parameters include at least one of the following: design pressure, design temperature range, operating temperature range, service life, material requirements, geometric volume, and equipment category.

[0020] In some embodiments, in step two, the dimensions of the inner liner structure include the height, diameter, and wall thickness of the inner liner; the laying scheme includes the number of circumferential winding layers, the number of helical winding layers, and the helical winding angle.

[0021] In some embodiments, in step three, the ply breakage coefficient k ranges from 1.2 to 1.5.

[0022] In some embodiments, in step three, the equivalent modulus of the fiber winding layer It is calculated based on material parameters and classical laminate theory.

[0023] In some embodiments, in step four, adjusting the fiber winding layer laying scheme specifically includes one or more of the following: increasing the fiber winding layer thickness, changing the layup ratio, and adjusting the layup angle.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are:

[0025] Compared to existing numerical simulation-based methods for determining the impact damage safety of hydrogen storage cylinders, the aforementioned design method for impact-resistant lightweight composite hydrogen storage cylinders eliminates the need for complex finite element models. This avoids dependence on material constitutive and failure parameters and cumbersome data curve fitting, reducing implementation difficulty and learning costs, and facilitating understanding and application by engineers. Furthermore, this method can reasonably calculate and quantify the residual strength of cylinders of different specifications during the design phase, effectively avoiding excessive material redundancy while ensuring the impact resistance safety performance of the cylinders, thus achieving lightweight composite hydrogen storage cylinders. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart of the design method for an impact-resistant lightweight composite hydrogen storage cylinder according to the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the hydrogen storage cylinder in the impact-resistant lightweight composite material hydrogen storage cylinder design method of the present invention;

[0029] Figure 3 This is a displacement cloud diagram of the hydrogen storage cylinder in the finite element model of the impact-resistant lightweight composite material hydrogen storage cylinder design method of the present invention; Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Reference Figures 1-3 This is an embodiment of the impact-resistant lightweight composite material hydrogen storage cylinder design method of the present invention. For example... Figure 2 As shown, the composite material hydrogen storage cylinder includes an inner liner 1 and a fiber winding layer 2 disposed on the outside of the inner liner.

[0032] like Figure 1 As shown, the design method for impact-resistant lightweight composite hydrogen storage cylinders includes the following steps:

[0033] Step 1: Determine the design requirements of the hydrogen storage cylinder and the magnitude of the impact kinetic energy it needs to withstand.

[0034] Step 2: Conduct preliminary design of the hydrogen storage cylinder structure dimensions, determine the inner liner structure dimensions and the laying scheme of the outer fiber winding layer; and check the load-bearing strength of the preliminary hydrogen storage cylinder design: if it fails, redesign the laying scheme; if it passes, proceed to Step 3.

[0035] Step 3: Calculate the wall thickness damage h of the hydrogen storage cylinder under the impact of the projectile with initial kinetic energy E0 along the wall thickness direction, and determine the remaining strength S of the hydrogen storage cylinder based on the wall thickness damage h.

[0036] The wall thickness damage amount h is solved by the following equation:

[0037] ;

[0038] in, For the mass of the projectile; The projectile's impact velocity; The structural stiffness coefficient; This is the contact stiffness coefficient; The equivalent modulus of the fiber winding layer; ; R is the thickness of the fiber winding layer; R is the radius of the mid-surface of the fiber winding layer. Poisson's ratio in the thickness direction of the fiber winding layer; Where is the radius of the projectile; The Poisson's ratio of the projectile; This is the elastic modulus of the projectile.

[0039] The formula for calculating the residual strength S is as follows:

[0040] ;

[0041] Where k is the ply fracture coefficient, δ is the fiber winding thickness, and h is the wall thickness damage.

[0042] Step 4: Determine the impact resistance safety performance of the hydrogen storage cylinder based on the residual strength S calculated in Step 3:

[0043] If S < 0.7, it is determined that the impact resistance is insufficient. Return to step two to adjust the fiber winding layer laying scheme and carry out reinforcement design.

[0044] If S≥0.9, it is determined to be strength redundancy, and we return to step two to reduce the thickness of the fiber winding layer to achieve lightweighting;

[0045] If 0.7 ≤ S < 0.9, it is determined that the design requirements are met.

[0046] The impact-resistant lightweight composite material hydrogen storage cylinder design method provided by this invention, compared with existing numerical simulation-based methods for determining the impact damage safety of hydrogen storage cylinders, eliminates the need to construct complex finite element models, avoids dependence on material constitutive and failure parameters and cumbersome data curve fitting, reduces implementation difficulty and learning costs, and facilitates understanding and application by engineers. Simultaneously, this method can reasonably calculate and quantify the residual strength of cylinders of different specifications during the design phase, effectively avoiding excessive material redundancy while ensuring the impact resistance safety performance of the cylinders, thereby achieving lightweight composite material hydrogen storage cylinders.

[0047] Compared to current technical standards, this method can achieve lightweight hydrogen storage cylinders while meeting impact safety requirements. Compared to existing methods for determining the impact damage safety of hydrogen storage cylinders based on numerical simulation, this method does not require the construction of a finite element model, and has advantages such as low implementation difficulty, speed and simplicity, and ease of understanding by engineers.

[0048] To further clarify the technical solution of the present invention, the various steps of the present invention will be described in more detail below.

[0049] Step 1: Define the design requirements and impact resistance targets for hydrogen storage cylinders.

[0050] In step one, the design requirements for hydrogen storage cylinders include their operating conditions, usage requirements, and main technical parameters. These main technical parameters include design pressure, design temperature range, operating temperature range, service life, material requirements, geometric volume, and equipment category.

[0051] Step 2: Design and verification of hydrogen storage cylinder structural dimensions

[0052] In step two, by consulting the design data of composite material hydrogen storage cylinders, the main structural dimensions of the inner liner of the hydrogen storage cylinder are determined, such as height, diameter, and wall thickness. Based on the structural dimensions of the inner liner, a fiber winding layer (composite material layer) laying scheme is formulated. This laying scheme includes the number of circumferential winding layers, the number of helical winding layers, and the helical winding angle.

[0053] The load-bearing strength of the composite hydrogen storage cylinder was checked by establishing a finite element model to verify whether the fiber winding layer laying scheme was qualified. If the load-bearing strength check failed, the fiber winding layer laying scheme needed to be redesigned.

[0054] Step 3: Calculate the remaining strength of the hydrogen storage cylinder

[0055] like Figure 2 As shown, under the impact of a projectile with an initial kinetic energy of E0, the fiber winding layer on the outside of the hydrogen storage cylinder will suffer damage along the wall thickness direction. The radial damage depth caused by this impact is defined as the wall thickness damage amount h, which serves as a key parameter for subsequent quantification of residual strength. In applications, the initial kinetic energy E0 can be pre-multiplied by a safety margin factor according to the severity of the hydrogen storage cylinder's service environment to further improve the safety of the design.

[0056] The wall thickness damage amount h can be solved using the following equation:

[0057] ;

[0058] in, For the mass of the projectile; The projectile's impact velocity; The structural stiffness coefficient; This is the contact stiffness coefficient; The equivalent modulus of the fiber winding layer; ; R is the thickness of the fiber winding layer; R is the radius of the mid-surface of the fiber winding layer. Poisson's ratio in the thickness direction of the fiber winding layer; Where is the radius of the projectile; The Poisson's ratio of the projectile; This is the elastic modulus of the projectile.

[0059] In the above formula Based on material parameters, the equations were calculated using Classical Lamination Theory (CLT). The unique real root h can be obtained by solving the equations using software such as MATLAB and Excel.

[0060] In step three, the residual strength of the hydrogen storage cylinder is defined as a parameter characterizing the load-bearing capacity of the damaged cylinder. After obtaining the wall thickness damage amount h, the residual strength S is calculated according to the following formula:

[0061] ;

[0062] Where k is the layup fracture coefficient, used to correct for strength reduction caused by fiber breakage, interlayer delamination and stress concentration, and a value of 1.2-1.5 is recommended; δ is the fiber winding layer thickness; and h is the wall thickness damage.

[0063] In other embodiments, the residual strength of a hydrogen storage cylinder based on the depth of damage can be converted into residual strength based on the proportion of the damaged area or the proportion of the damaged volume by utilizing the geometric mapping relationship between the damaged area and the amount of wall thickness damage.

[0064] Step 4: Determining the Impact Resistance Safety Performance of Hydrogen Storage Cylinders

[0065] In step four, the impact resistance safety performance of the hydrogen storage cylinder is determined based on the residual strength S calculated in step three:

[0066] ① If S < 0.7, it is determined that the impact resistance is insufficient. Return to step 2 to adjust the fiber winding layer laying scheme, such as increasing the fiber winding layer thickness, changing the layup ratio or adjusting the layup angle, in order to carry out reinforcement design.

[0067] ② If S≥0.9, it is determined to be strength redundancy. Return to step two to reduce the thickness of the fiber winding layer and perform thinning optimization to achieve lightweighting;

[0068] ③ If 0.7≤S<0.9, it is determined that the design requirements are met.

[0069] Step 5: Complete the impact-resistant and lightweight design of the hydrogen storage cylinder

[0070] After confirming that the hydrogen storage cylinder meets the impact resistance safety performance requirements, the structural design parameters of the current hydrogen storage cylinder are output as the final solution, thus completing the impact-resistant and lightweight design.

[0071] The technical solution of the present invention will be described in detail below through specific and exemplary embodiments.

[0072] According to the technical solution steps of the present invention, a 70MPa Type IV impact-resistant lightweight hydrogen storage cylinder is designed with a cylinder volume of 50L and can withstand impact kinetic energy of not less than 330J.

[0073] 1. Define the design requirements and impact resistance targets for hydrogen storage cylinders.

[0074] Based on the working environment, the main technical parameters are determined, as shown in Table 1 below.

[0075] Table 1 Main Technical Parameters

[0076] 2. Design and verification of hydrogen storage cylinder structural dimensions

[0077] Based on the designed hydrogen storage cylinder with a geometric volume of 50L, the proposed outer diameter of the inner liner is 336mm, the inner liner wall thickness is 5mm, the inner liner body length is 538mm, the ellipsoid ratio of the end cap is set to 2, the polar hole radius is 40mm, and the total cylinder length is 798mm. The composite material layer is made of Toray T-700 carbon fiber / epoxy resin composite, with a fiber to resin ratio of 65:35. The composite material parameters were obtained from relevant literature and are shown in Table 2.

[0078] Table 2 Mechanical parameters of T-700 resin-based composite materials

[0079] The fiber winding layer of hydrogen storage cylinders is mainly composed of circumferential and helical windings, calculated according to the winding angle formula of the cylinder section:

[0080] ;

[0081] In the formula, The angle at which the fiber is wound at the end cap's polar hole; denoted as Ω; D is the outer diameter of the inner liner of the gas cylinder.

[0082] The thickness of the spirally wound fiber in the hydrogen storage cylinder is:

[0083] ;

[0084] In the formula, The minimum burst pressure is K; K is the stress balance coefficient, taken as 0.75. For fiber strength.

[0085] The thickness of the circumferentially wound fiber in the hydrogen storage cylinder is:

[0086] ;

[0087] The thickness of a single layer of T-700 carbon fiber is approximately 0.227 mm, from which the number of helical winding layers can be calculated as follows:

[0088] ;

[0089] The number of circumferential winding layers is:

[0090] ;

[0091] The fiber winding layer adopts an alternating arrangement of helical and circumferential winding layers, and the winding layer laying scheme is as follows: Among them, 90° is circumferential laying, and 10°, 18°, 25°, 32°, 40° and 45° are spiral laying; the subscript indicates the number of laying layers.

[0092] Based on the aforementioned design parameters for composite material hydrogen storage cylinders, a finite element model was established to verify the structural load-bearing strength. The displacement contour map of the storage tank under an internal pressure of 157.5 MPa is shown below. Figure 3 As shown, the hydrogen storage cylinder did not burst under an internal pressure of 157.5 MPa, and the verification was successful.

[0093] 3. Calculate the remaining strength of the hydrogen storage cylinder.

[0094] According to design requirements, the hydrogen storage cylinder can withstand an impact kinetic energy of no less than 330J. The projectile uses a 9.75g standard-sized fragmentation simulated projectile with a diameter of 11.35mm. The impact velocity of the projectile is calculated using the following formula:

[0095] ;

[0096] The equivalent modulus of the fiber winding layer was calculated based on the classical laminate theory (CLT). First, construct the single-layer material reduced stiffness matrix. :

[0097] ;

[0098] ;

[0099] ;

[0100] ;

[0101] ;

[0102] The stiffness of each ply is transformed to the circumferential and axial directions of the gas cylinder to obtain the off-axis stiffness matrix. :

[0103] ;

[0104] ;

[0105] ;

[0106] ;

[0107] ;

[0108] ;

[0109] ;

[0110] In the formula, Set the fiber layup angle (10°, 18°, ..., 90°).

[0111] The tensile stiffness matrix is ​​obtained by weighted averaging of the stiffness of all plies. :

[0112] ;

[0113] ;

[0114] In the formula, The thickness of each T-700 carbon fiber single layer is 0.227mm.

[0115] final It can be calculated using the following formula:

[0116] ;

[0117] In the formula, The thickness of the fiber winding layer is 15.8 mm.

[0118] Under an impact of 261.5 m / s, the wall thickness damage h of the hydrogen storage cylinder can be solved by the following equation:

[0119] ;

[0120] In the formula, The mass of the projectile is 9.75g; The projectile's impact velocity is 261.5 m / s; The equivalent modulus of the fiber winding layer is 85 GPa; ; R is the thickness of the fiber winding layer, which is 15.8 mm; R is the radius of the mid-surface of the fiber winding layer, which is 175.9 mm. Poisson's ratio in the thickness direction of the fiber winding layer is 0.3; The projectile radius is 5.675 mm. The Poisson's ratio for the projectile is 0.3. The elastic modulus of the projectile is 210 GPa.

[0121] Using Excel software, h = 3.66 mm was calculated. After obtaining the wall thickness damage h, the residual strength coefficient S was calculated according to the following formula:

[0122] ;

[0123] In the formula, k is the ply breakage coefficient, which is taken as 1.2 in this embodiment.

[0124] 4. Impact resistance safety performance assessment of hydrogen storage cylinders

[0125] The impact resistance safety performance of the hydrogen storage cylinder is checked based on the calculated residual strength S. According to regulations:

[0126] ① If S < 0.7, it is determined that the impact resistance is insufficient, and the process returns to step two to adjust the composite material winding layer laying scheme;

[0127] ② If S≥0.9, it is determined to be strength redundancy, and return to step two to reduce the thickness of the fiber winding layer to achieve lightweighting;

[0128] ③ If 0.7≤S<0.9, it is determined that the design requirements are met.

[0129] The calculation results show that the residual strength S of the hydrogen storage cylinder under an impact load of 330J is 0.72, which is within the design preset range of 0.7≤S<0.9, and meets the impact resistance and lightweight design requirements.

[0130] 5. Completed the impact-resistant and lightweight design of hydrogen storage cylinders.

[0131] The composite material hydrogen storage cylinder passed the structural load-bearing strength and impact resistance safety performance verification, meeting the performance requirements. The design of the impact-resistant lightweight composite material hydrogen storage cylinder is now complete. The main parameters of the designed lightweight composite material hydrogen storage cylinder are shown in Table 3 below.

[0132] Table 3 Main Technical Parameters of Lightweight Composite Material Hydrogen Storage Cylinders

[0133] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A design method for an impact-resistant, lightweight composite material hydrogen storage cylinder, characterized in that, include: Step 1: Determine the design requirements of the hydrogen storage cylinder and the magnitude of the impact kinetic energy it needs to withstand; Step 2: Conduct preliminary design of the hydrogen storage cylinder structure dimensions, determine the inner liner structure dimensions and the laying scheme of the outer fiber winding layer; and check the load-bearing strength of the preliminary hydrogen storage cylinder design: if it fails, redesign the laying scheme; if it passes, proceed to Step 3; Step 3: Calculate the wall thickness damage h of the hydrogen storage cylinder under the impact of the projectile with initial kinetic energy E0 along the wall thickness direction, and determine the remaining strength S of the hydrogen storage cylinder based on the wall thickness damage h. The wall thickness damage amount h is solved by the following equation: ； in, For the mass of the projectile; The projectile's impact velocity; The structural stiffness coefficient; This is the contact stiffness coefficient; The equivalent modulus of the fiber winding layer; ; R is the thickness of the fiber winding layer; R is the radius of the mid-surface of the fiber winding layer. Poisson's ratio in the thickness direction of the fiber winding layer; Where is the radius of the projectile; The Poisson's ratio of the projectile; The elastic modulus of the projectile; The formula for calculating the residual strength S is as follows: ； Where k is the ply fracture coefficient, δ is the fiber winding thickness, and h is the wall thickness damage. Step 4: Determine the impact resistance safety performance of the hydrogen storage cylinder based on the residual strength S calculated in Step 3: If S < 0.7, it is determined that the impact resistance is insufficient, and the process returns to step two to adjust the fiber winding layer laying scheme. If S≥0.9, it is determined to be strength redundancy, and we return to step two to reduce the thickness of the fiber winding layer to achieve lightweighting; If 0.7 ≤ S < 0.9, it is determined that the design requirements are met.

2. The design method for impact-resistant lightweight composite hydrogen storage cylinders according to claim 1, characterized in that, In step one, the design requirements for the hydrogen storage cylinder include the working conditions, usage requirements, and main technical parameters of the hydrogen storage cylinder; the main technical parameters include at least one of the following: design pressure, design temperature range, operating temperature range, service life, material requirements, geometric volume, and equipment category.

3. The design method for impact-resistant lightweight composite hydrogen storage cylinders according to claim 1, characterized in that, In step two, the dimensions of the inner liner structure include the height, diameter, and wall thickness of the inner liner; the laying scheme includes the number of circumferential winding layers, the number of spiral winding layers, and the spiral winding angle.

4. The design method for impact-resistant lightweight composite hydrogen storage cylinders according to claim 1, characterized in that, In step three, the ply breakage coefficient k ranges from 1.2 to 1.

5.

5. The design method for impact-resistant lightweight composite hydrogen storage cylinders according to claim 1, characterized in that, In step three, the equivalent modulus of the fiber winding layer It is calculated based on material parameters and classical laminate theory.

6. The design method for impact-resistant lightweight composite hydrogen storage cylinders according to claim 1, characterized in that, In step four, adjusting the fiber winding layer laying scheme specifically includes one or more of the following: increasing the fiber winding layer thickness, changing the layup ratio, and adjusting the layup angle.

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