Method for predicting limit internal pressure of single-layer material cylindrical pressure vessel and related device

Abstract

The invention discloses a limit internal pressure prediction method of a single-layer material cylinder type pressure vessel and a related device, and relates to the technical field of material science and engineering application, and the method comprises the following steps: firstly, based on plastic strain and the original external diameter and the original internal diameter of the single-layer material cylinder type pressure vessel, calculating the limit internal pressure of the single-layer material cylinder type pressure vessel; calculating the updated outer diameter and the updated inner diameter of the single-layer material cylindrical pressure vessel considering the influence of plastic deformation on the geometric dimension of the vessel, and then respectively replacing the yield strength, the original outer diameter and the original inner diameter in a limit internal pressure calculation formula based on ideal elastic-plastic assumption with the tensile strength, the updated outer diameter and the updated inner diameter; and subsequently, the limit internal pressure calculation formula considering the plastic strengthening effect is used for predicting the limit internal pressure of the single-layer material cylinder type pressure vessel. According to the method, the limit internal pressure of the single-layer material cylinder type pressure vessel can be quickly and accurately predicted.

Description

Technical Field

[0001] The present application relates to the field of materials science and engineering application technology, and in particular to a method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel and a related device. Background Art

[0002] In industrial production and scientific research, cylindrical pressure vessels are widely used in chemical, petroleum, aerospace and other fields due to their simple structure, convenient processing and ability to effectively store high-pressure fluids. To ensure the safe operation of such cylindrical pressure vessels, the key is to accurately predict their ultimate internal pressure under extreme working conditions. The ultimate internal pressure refers to the maximum internal pressure that the cylindrical pressure vessel can withstand without being damaged.

[0003] Traditionally, the prediction of the ultimate internal pressure of cylindrical pressure vessels made of a single metal material (i.e., single-layer cylindrical pressure vessels) is usually based on the ideal elastic-plastic assumption, that is, the material maintains a constant yield stress after yielding. However, in fact, after many metal materials enter the plastic stage, their yield stress increases with the increase of plastic strain. This phenomenon is called plastic strengthening or strain hardening. This means that if the plastic strengthening effect is taken into account, the actual bearing capacity of the single-layer cylindrical pressure vessel may be higher than the result predicted based only on the ideal elastic-plastic assumption. Therefore, the method of predicting the ultimate internal pressure based on the ideal elastic-plastic assumption is less accurate. In addition, finite element simulation technology is also used to predict the ultimate internal pressure of single-layer cylindrical pressure vessels. Although this method can take into account the plastic strengthening effect when predicting the ultimate internal pressure of single-layer cylindrical pressure vessels, it is necessary to establish a finite element simulation model of the single-layer cylindrical pressure vessel and perform complex finite element simulation calculations. Therefore, the method of predicting the ultimate internal pressure based on finite element simulation technology is less efficient.

[0004] In view of the above problems, the existing technology is still insufficient in predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel taking into account the plastic strengthening effect, and lacks an effective, fast and accurate prediction method. Summary of the invention

[0005] The purpose of this application is to provide a method and related device for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel, which can quickly and accurately predict the ultimate internal pressure of a single-layer material cylindrical pressure vessel.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel, the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel comprising:

[0008] Obtaining the tensile strength and plastic strain of the material used for the single-layer material cylindrical pressure vessel; the plastic strain is the strain corresponding to the tensile strength;

[0009] Based on the plastic strain and the original outer diameter and the original inner diameter of the single-layer material cylindrical pressure vessel, calculate the updated outer diameter and the updated inner diameter of the single-layer material cylindrical pressure vessel considering the influence of plastic deformation on the geometric dimensions of the vessel;

[0010] The tensile strength, the updated outer diameter and the updated inner diameter are used to replace the yield strength, the original outer diameter and the original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption, so as to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect, and the ultimate internal pressure of the single-layer material cylindrical pressure vessel is predicted using the ultimate internal pressure calculation formula considering the plastic strengthening effect.

[0011] Optionally, obtaining the tensile strength and plastic strain of the material used for the single-layer cylindrical pressure vessel specifically includes:

[0012] Obtaining a stress-strain curve obtained by a uniaxial tensile test of a material used in a single-layer cylindrical pressure vessel;

[0013] The tensile strength and plastic strain of the material used for the single-layer cylindrical pressure vessel are determined based on the stress-strain curve.

[0014] Optionally, the plastic strain is equal to the radial strain and circumferential strain generated by a single-layer material cylindrical pressure vessel under an ultimate internal pressure load.

[0015] Optionally, the calculation formulas for the updated outer diameter and the updated inner diameter are:

[0016] r 0j =(r0+r i ) / 2+[(r0+r i ) / 2]*e+(r0-r i ) / 2-e*(r0-r i ) / 2;

[0017] r ij =(r0+r i ) / 2+[(r0+r i ) / 2]*e-(r0-r i ) / 2+e*(r0-r i ) / 2;

[0018] Among them, r 0j is the updated outer diameter; r0 is the original outer diameter; r i is the original inner diameter; e is the plastic strain; r ij To update the inner diameter.

[0019] Optionally, the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption is:

[0020]

[0021] Among them, P L is the ultimate internal pressure predicted based on the ideal elastic-plastic assumption; σ f1 is the yield strength; r0 is the original outer diameter; r i is the original inner diameter;

[0022] The calculation formula of the ultimate internal pressure considering the plastic strengthening effect is:

[0023]

[0024] Among them, P Q is the predicted ultimate internal pressure considering the plastic strengthening effect; σ b1 is the tensile strength; r 0j To update the outer diameter; r ij To update the inner diameter.

[0025] Optionally, the tensile strength and yield strength are related by:

[0026] σ b1 =σ f1 +M*e;

[0027] Among them, σ b1 is the tensile strength; f1 is the yield strength; M is the plastic modulus; e is the plastic strain.

[0028] In a second aspect, the present application provides a device for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material, the device comprising:

[0029] A data acquisition module, used to acquire the tensile strength and plastic strain of the material used for the single-layer cylindrical pressure vessel; the plastic strain is the strain corresponding to the tensile strength;

[0030] A size updating module, used for calculating an updated outer diameter and an updated inner diameter of the single-layer material cylindrical pressure vessel taking into account the influence of plastic deformation on the geometric dimensions of the vessel based on the plastic strain and the original outer diameter and the original inner diameter of the single-layer material cylindrical pressure vessel;

[0031] The ultimate internal pressure prediction module is used to replace the yield strength, original outer diameter and original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption with the tensile strength, the updated outer diameter and the updated inner diameter, respectively, to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect, and use the ultimate internal pressure calculation formula considering the plastic strengthening effect to predict the ultimate internal pressure of the single-layer material cylindrical pressure vessel.

[0032] In a third aspect, the present application provides a computer device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any of the above-described methods for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel.

[0033] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel as described above.

[0034] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel as described above.

[0035] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0036] The present application provides a method for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material and a related device. In the process of predicting the ultimate internal pressure, the plastic strengthening effect of the metal material is fully considered. First, based on the plastic strain and the original outer diameter and original inner diameter of the cylindrical pressure vessel made of a single-layer material, the updated outer diameter and updated inner diameter of the cylindrical pressure vessel made of a single-layer material that consider the influence of plastic deformation on the geometric dimensions of the container are calculated. Then, the tensile strength, the updated outer diameter and the updated inner diameter are used to replace the yield strength, the original outer diameter and the original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption, respectively, to obtain the ultimate internal pressure calculation formula that considers the plastic strengthening effect. Subsequently, the ultimate internal pressure calculation formula that considers the plastic strengthening effect is used to predict the ultimate internal pressure of the cylindrical pressure vessel made of a single-layer material. The present application not only considers the plastic strengthening effect of the metal material, but also the ultimate internal pressure of the cylindrical pressure vessel made of a single-layer material. The strength enhancement effect brought about by the tensile strength is replaced by the yield strength, and the influence of the plastic deformation of the plastic strengthening effect of the metal material on the change of the geometric size of the container is also taken into account. The plastic strain is used to update the original outer diameter and the original inner diameter, and the updated outer diameter replaces the original outer diameter, and the updated inner diameter replaces the original inner diameter. In this way, the application can more accurately reflect the actual situation when predicting the ultimate internal pressure of the single-layer material cylindrical pressure vessel, improve the prediction accuracy, prediction efficiency and reliability, compared with the ultimate internal pressure prediction method based on the ideal elastic-plastic assumption, it can predict the ultimate internal pressure under the premise of considering the plastic strengthening effect of the metal material, thereby improving the prediction accuracy, and compared with the ultimate internal pressure prediction method based on the finite element simulation method, there is no need to establish a model and perform complex calculations, thereby improving the prediction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is an application environment diagram of a method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel provided in Example 1 of the present application.

[0039] Figure 2 A schematic flow chart of a method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel provided in Example 1 of the present application.

[0040] Figure 3 This is a schematic structural diagram of the single-layer material cylindrical pressure vessel provided in Example 1 of the present application.

[0041] Figure 4 This is a schematic diagram of the stress-strain curve provided in Example 1 of the present application.

[0042] Figure 5 A schematic diagram of the functional modules of a device for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel provided in Example 2 of the present application.

[0043] Figure 6 A schematic diagram of the structure of a computer device provided in Example 3 of the present application. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] Example 1

[0046] The method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the terminal communicates with the server through the network. The data storage system can store the data that the server needs to process. The data storage system can be set up separately, integrated on the server, or placed on the cloud or other servers. The terminal can send a pending prediction request (used to request a prediction of the ultimate internal pressure of a single-layer material cylindrical pressure vessel) to the server. After the server receives the pending prediction request, for the pending prediction request, the server obtains the tensile strength and plastic strain of the material used for the single-layer material cylindrical pressure vessel; based on the plastic strain and the original outer diameter and original inner diameter of the single-layer material cylindrical pressure vessel, the updated outer diameter and updated inner diameter of the single-layer material cylindrical pressure vessel considering the influence of plastic deformation on the geometric dimensions of the container are calculated; the tensile strength, updated outer diameter and updated inner diameter are respectively replaced with the yield strength, original outer diameter and original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect, and the ultimate internal pressure of the single-layer material cylindrical pressure vessel is predicted using the ultimate internal pressure calculation formula considering the plastic strengthening effect. The server may feed back the obtained prediction result of the limit internal pressure for the prediction request to the terminal.

[0047] In addition, in some embodiments, the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel can also be implemented independently by a server or a terminal. For example, the terminal can directly process the prediction request to be processed, or the server can obtain the prediction request to be processed from the data storage system and process the prediction request to be processed.

[0048] The terminals may be, but are not limited to, various desktop computers, laptops, smart phones, tablet computers, IoT devices and portable wearable devices. IoT devices may be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. Portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. The server may be implemented as an independent server or a server cluster consisting of multiple servers, or a cloud server.

[0049] like Figure 2 As shown, a method for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1 The server in the example is used to illustrate the following steps:

[0050] Step S1, obtaining the tensile strength and plastic strain of the material used for the single-layer cylindrical pressure vessel; the plastic strain is the strain corresponding to the tensile strength.

[0051] Step S2, based on the plastic strain and the original outer diameter and original inner diameter of the single-layer material cylindrical pressure vessel, calculate the updated outer diameter and updated inner diameter of the single-layer material cylindrical pressure vessel taking into account the influence of plastic deformation on the geometric dimensions of the vessel.

[0052] Step S3, replacing the yield strength, original outer diameter and original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption with the tensile strength, the updated outer diameter and the updated inner diameter respectively, to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect, and using the ultimate internal pressure calculation formula considering the plastic strengthening effect to predict the ultimate internal pressure of the single-layer material cylindrical pressure vessel.

[0053] In order to make up for the shortcomings of the prior art, it is urgently necessary to develop a new method that can quickly and accurately predict the ultimate internal pressure of a single-layer cylindrical pressure vessel when considering the influence of the plastic strengthening effect of the metal material. By implementing the above-mentioned steps S1 to S3, the present application provides a new prediction method, specifically a method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel considering the plastic strengthening effect of the metal material. In the process of predicting the ultimate internal pressure, the plastic strengthening effect of the metal material is fully considered. First, based on the plastic strain and the original outer diameter and original inner diameter of the single-layer cylindrical pressure vessel, the updated outer diameter and updated inner diameter of the single-layer cylindrical pressure vessel considering the influence of plastic deformation on the geometric dimensions of the container are calculated, and then the tensile strength, updated outer diameter and updated inner diameter are respectively replaced with the yield strength, original outer diameter and original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect. Subsequently, the ultimate internal pressure calculation formula considering the plastic strengthening effect is obtained. The ultimate internal pressure calculation formula of the effect is used to predict the ultimate internal pressure of a single-layer cylindrical pressure vessel. This application not only takes into account the strength enhancement effect brought about by the plastic strengthening effect of metal materials, and replaces the yield strength with the tensile strength, but also takes into account the influence of the plastic deformation of the plastic strengthening effect of metal materials on the change of the geometric dimensions of the container, and uses plastic strain to update the original outer diameter and the original inner diameter, and replaces the original outer diameter with the updated outer diameter, and replaces the original inner diameter with the updated inner diameter. In this way, this application can more accurately reflect the actual situation when predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel, improve the prediction accuracy, prediction efficiency and reliability, and solve the problem that the traditional ultimate internal pressure prediction method based on the ideal elastic-plastic assumption fails to fully consider the plastic strengthening effect of metal materials, thereby being able to quickly and accurately predict the ultimate internal pressure of a single-layer cylindrical pressure vessel, and provide a more reliable tool for the design and safety assessment of single-layer cylindrical pressure vessels.

[0054] like Figure 3 As shown, the single-layer cylindrical pressure vessel is made of a layer of metal material, which is a hollow structure, including the original inner diameter r i and the original outer diameter r o , original inner diameter r i and the original outer diameter r o It refers to the inner diameter and outer diameter measured under the premise that the single-layer cylindrical pressure vessel does not deform, given the known original inner diameter r i and the original outer diameter r o When combined with the yield strength σ of the material used for the single-layer cylindrical pressure vessel f1 , the traditional calculation formula of the limit internal pressure based on the ideal elastic-plastic assumption can be used to predict the limit internal pressure of the single-layer material cylindrical pressure vessel. The calculation formula of the limit internal pressure based on the ideal elastic-plastic assumption is:

[0055]

[0056] In formula (1), P L is the ultimate internal pressure predicted based on the ideal elastic-plastic assumption; σ f1 is the yield strength; r0 is the original outer diameter; r i is the original inner diameter.

[0057] If the strength enhancement effect brought by the plastic strengthening effect of metal materials is to be considered, the tensile strength of the material can be used to replace the yield strength of the material. The relationship between the tensile strength and the yield strength is:

[0058] σ b1 =σ f1 +M*e(2)

[0059] In formula (2), σ b1 is the tensile strength; f1 is the yield strength; M is the plastic modulus; e is the plastic strain.

[0060] For thick-walled cylinders, based on the volume incompressibility condition and the axial strain ε z = 0, it can be obtained that under the action of the ultimate internal pressure load, the radial strain of the single-layer cylindrical pressure vessel is equal to the circumferential strain, that is: ε r =-ε θ , ε r is the radial strain, ε θ The radial strain causes the wall thickness of the single-layer cylindrical pressure vessel to change, and the circumferential strain causes the radius of the single-layer cylindrical pressure vessel to change. The plastic strain of the material is e = |ε r |=|-ε θ |, that is, the plastic strain is equal to the radial strain and circumferential strain generated by a single-layer cylindrical pressure vessel under the action of the ultimate internal pressure load.

[0061] Based on the above theory, this embodiment can further use plastic strain to update the original outer diameter and the original inner diameter to obtain an updated outer diameter and an updated inner diameter, thereby determining the inner and outer diameter dimensions of the single-layer cylindrical pressure vessel that undergoes plastic deformation after being subjected to the ultimate internal pressure load, so as to consider the influence of the plastic deformation of the plastic strengthening effect of the metal material on the change of the geometric dimensions of the container. Among them, the calculation formula for the updated outer diameter and the updated inner diameter is:

[0062] r 0j =(r0+r i ) / 2+[(r0+r i ) / 2]*e+(r0-r i ) / 2-e*(r0-r i ) / 2(3)

[0063] r ij =(r0+r i ) / 2+[(r0+r i ) / 2]*e-(r0-r i ) / 2+e*(r0-r i ) / 2(4)

[0064] In the above formula, r 0j is the updated outer diameter; r0 is the original outer diameter; r i is the original inner diameter; e is the plastic strain; r ij To update the inner diameter.

[0065] In the above formula, (r o +r i ) / 2 represents the radius of the container, [(r o +r i ) / 2]*e represents the increase in the median diameter when the container expands under the action of the ultimate internal pressure load and the container material undergoes plastic strain e deformation. Therefore, (r o +r i ) / 2+[(r o +r i ) / 2]*e represents the radius of the container after expansion, e*(r o -r i ) represents the reduction in the wall thickness of the container when it expands under the action of the ultimate internal pressure load, so (r o -r i ) / 2-e*(r o -r i ) / 2 represents the distance between the container wall and the expanded median diameter when the container expands under the action of the ultimate internal pressure load.

[0066] The tensile strength, updated outer diameter and updated inner diameter are used to replace the yield strength, original outer diameter and original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption, respectively, to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect. The ultimate internal pressure calculation formula considering the plastic strengthening effect is:

[0067]

[0068] In formula (5), P Q is the predicted ultimate internal pressure considering the plastic strengthening effect; σ b1 is the tensile strength; r 0j To update the outer diameter; r ij To update the inner diameter.

[0069] The above formula (5) is the theoretical calculation formula for the ultimate internal pressure of a single-layer cylindrical pressure vessel considering the plastic strengthening effect of metal materials. The ultimate internal pressure can be quickly and accurately predicted using formula (5). Compared with the ultimate internal pressure prediction method based on the ideal elastic-plastic assumption, the ultimate internal pressure can be predicted under the premise of considering the plastic strengthening effect of metal materials, thereby improving the prediction accuracy. Compared with the ultimate internal pressure prediction method based on the finite element simulation method, there is no need to establish a model and perform complex calculations, thereby improving the prediction efficiency.

[0070] The above is the theoretical derivation process of the ultimate internal pressure calculation formula considering the plastic strengthening effect. In practical applications, it is necessary to clarify the specific values ​​of the parameters. Therefore, in this embodiment, the tensile strength and plastic strain of the material used for the single-layer material cylindrical pressure vessel are first obtained, and the plastic strain is the strain corresponding to the tensile strength. Then, based on the plastic strain and the original outer diameter and original inner diameter of the single-layer material cylindrical pressure vessel, the updated outer diameter and updated inner diameter of the single-layer material cylindrical pressure vessel considering the influence of plastic deformation on the geometric dimensions of the container are calculated. Finally, the tensile strength, updated outer diameter and updated inner diameter are used to replace the yield strength, original outer diameter and original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption, respectively, to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect. At this time, the parameter values ​​in the ultimate internal pressure calculation formula considering the plastic strengthening effect are all known, and the ultimate internal pressure of the single-layer material cylindrical pressure vessel can be predicted later using the ultimate internal pressure calculation formula considering the plastic strengthening effect.

[0071] In S1, the tensile strength and plastic strain of the material used for the single-layer material cylindrical pressure vessel are obtained, specifically including: obtaining a stress-strain curve obtained by a uniaxial tensile test on the material used for the single-layer material cylindrical pressure vessel; and determining the tensile strength and plastic strain of the material used for the single-layer material cylindrical pressure vessel based on the stress-strain curve.

[0072] like Figure 4 As shown, it is a schematic diagram of the stress-strain curve. Obviously, the elastic modulus E and yield strength σ can be determined based on the stress-strain curve. f1 , plastic modulus M, tensile strength σ b1 and plastic strain e, at this time, the tensile strength σ b1 The corresponding strain in the stress-strain curve is the plastic strain e.

[0073] Assume that the elastic modulus E = 200000, the original outer diameter r0 = 1050, and the original inner diameter r i =1000, plastic strain e=0.2, yield strength σ f1=350MPa. For 6 different materials (assuming different plastic modulus M), the ultimate internal pressure of the single-layer cylindrical pressure vessel is predicted by finite element simulation technology and the theoretical calculation formula of this embodiment (i.e., formula (5)). The prediction results are shown in Table 1. Based on Table 1, it can be seen that the error between the ultimate internal pressure predicted by the theoretical calculation formula of this embodiment and the ultimate internal pressure predicted by the finite element simulation technology is extremely small, indicating that the prediction method of this embodiment is simple, has high prediction accuracy and high prediction efficiency.

[0074] Table 1 Comparison of prediction results between finite element simulation and theoretical calculation formula of this embodiment

[0075]

[0076] The embodiment of the present application also provides an application scenario, which applies the above-mentioned method for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material. Specifically, the method for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material provided in the present embodiment can be applied in the ultimate internal pressure prediction scenario. The ultimate internal pressure prediction scenario includes a data acquisition link, a prediction link, and a display link. The data acquisition link is used to obtain the tensile strength and plastic strain of the material used for the cylindrical pressure vessel made of a single-layer material. The prediction link is used to establish a calculation formula for the ultimate internal pressure that considers the plastic strengthening effect based on the tensile strength and plastic strain, and use the calculation formula for the ultimate internal pressure that considers the plastic strengthening effect to predict the ultimate internal pressure of the cylindrical pressure vessel made of a single-layer material. The display link is used to display the predicted ultimate internal pressure to the user. The method for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material provided in the present embodiment belongs to the prediction link.

[0077] Example 2

[0078] Based on the same inventive concept, the embodiment of the present application also provides a device for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel for realizing the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel mentioned above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiment of the device for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel provided below can refer to the limitations of the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel mentioned above, and will not be repeated here.

[0079] like Figure 5 As shown, a device for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material is provided, and the device for predicting the ultimate internal pressure of a cylindrical pressure vessel made of a single-layer material comprises:

[0080] The data acquisition module M1 is used to obtain the tensile strength and plastic strain of the material used for the single-layer cylindrical pressure vessel; the plastic strain is the strain corresponding to the tensile strength.

[0081] The size updating module M2 is used to calculate the updated outer diameter and updated inner diameter of the single-layer material cylindrical pressure vessel taking into account the influence of plastic deformation on the geometric dimensions of the container based on the plastic strain and the original outer diameter and original inner diameter of the single-layer material cylindrical pressure vessel.

[0082] The limit internal pressure prediction module M3 is used to replace the yield strength, original outer diameter and original inner diameter in the limit internal pressure calculation formula based on the ideal elastic-plastic assumption with the tensile strength, the updated outer diameter and the updated inner diameter, respectively, to obtain the limit internal pressure calculation formula considering the plastic strengthening effect, and use the limit internal pressure calculation formula considering the plastic strengthening effect to predict the limit internal pressure of the single-layer material cylindrical pressure vessel.

[0083] Example 3

[0084] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 6 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel is implemented.

[0085] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0086] In an exemplary embodiment, a computer device is also provided, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel described in Example 1.

[0087] Example 4

[0088] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel described in Example 1 is implemented.

[0089] Example 5

[0090] An embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel described in Example 1.

[0091] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0092] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel, characterized in that: The method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel comprises: Obtaining the tensile strength and plastic strain of the material used for the single-layer material cylindrical pressure vessel; the plastic strain is the strain corresponding to the tensile strength; Based on the plastic strain and the original outer diameter and the original inner diameter of the single-layer material cylindrical pressure vessel, calculate the updated outer diameter and the updated inner diameter of the single-layer material cylindrical pressure vessel considering the influence of plastic deformation on the geometric dimensions of the vessel; The tensile strength, the updated outer diameter and the updated inner diameter are used to replace the yield strength, the original outer diameter and the original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption, so as to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect, and the ultimate internal pressure of the single-layer material cylindrical pressure vessel is predicted using the ultimate internal pressure calculation formula considering the plastic strengthening effect.

2. The method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel according to claim 1, characterized in that: Obtain the tensile strength and plastic strain of the materials used in single-layer cylindrical pressure vessels, including: Obtaining a stress-strain curve obtained by a uniaxial tensile test of a material used in a single-layer cylindrical pressure vessel; The tensile strength and plastic strain of the material used for the single-layer cylindrical pressure vessel are determined based on the stress-strain curve.

3. The method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel according to claim 1, characterized in that: The plastic strain is equal to the radial strain and circumferential strain generated by a single-layer material cylindrical pressure vessel under the action of an ultimate internal pressure load.

4. The method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel according to claim 3, characterized in that: The calculation formulas for the updated outer diameter and the updated inner diameter are: r 0j (r0+r i ) / 2+[(r0+r i ) / 2]*e+(r0-r i ) / 2-e*(r0-r i ) / 2 r ij (r0+r i ) / 2+[(r0+r i ) / 2]*e-(r0-r i ) / 2+e*(r0-r i ) / 2 Among them, r 0j is the updated outer diameter; r0 is the original outer diameter; r i is the original inner diameter; e is the plastic strain; r ij To update the inner diameter.

5. The method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel according to claim 1, characterized in that: The calculation formula of the ultimate internal pressure based on the ideal elastic-plastic assumption is: Among them, P L is the ultimate internal pressure predicted based on the ideal elastic-plastic assumption; σ f1 is the yield strength; r0 is the original outer diameter; r i is the original inner diameter; The calculation formula of the ultimate internal pressure considering the plastic strengthening effect is: Among them, P Q is the predicted ultimate internal pressure considering the plastic strengthening effect; σ b1 is the tensile strength; r 0j To update the outer diameter; r ij To update the inner diameter.

6. The method for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel according to claim 1, characterized in that: The relationship between tensile strength and yield strength is: s b1 =s f1 +M*e; Among them, σ b1 is the tensile strength; f1 is the yield strength; M is the plastic modulus; e is the plastic strain.

7. A device for predicting the ultimate internal pressure of a single-layer cylindrical pressure vessel, characterized in that: The device for predicting the ultimate internal pressure of the single-layer cylindrical pressure vessel comprises: A data acquisition module, used to acquire the tensile strength and plastic strain of the material used for the single-layer cylindrical pressure vessel; the plastic strain is the strain corresponding to the tensile strength; A size updating module, used for calculating an updated outer diameter and an updated inner diameter of the single-layer material cylindrical pressure vessel taking into account the influence of plastic deformation on the geometric dimensions of the vessel based on the plastic strain and the original outer diameter and the original inner diameter of the single-layer material cylindrical pressure vessel; The ultimate internal pressure prediction module is used to replace the yield strength, original outer diameter and original inner diameter in the ultimate internal pressure calculation formula based on the ideal elastic-plastic assumption with the tensile strength, the updated outer diameter and the updated inner diameter, respectively, to obtain the ultimate internal pressure calculation formula considering the plastic strengthening effect, and use the ultimate internal pressure calculation formula considering the plastic strengthening effect to predict the ultimate internal pressure of the single-layer material cylindrical pressure vessel.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for predicting the ultimate internal pressure of a single-layer material cylindrical pressure vessel according to any one of claims 1 to 6 is implemented.

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