Method for determining buckling failure of pre-stressed steel wire wound core cylinder for hot isostatic pressing equipment

Abstract

The present application relates to hot isostatic pressing equipment design and manufacturing technical field, disclose the hot isostatic pressing equipment is with the buckling failure determination method of pre-stressed steel wire winding core cylinder, obtain the basic information of target core cylinder;Determine the inner cylinder radius deformation value caused by winding operation under the pre-tightening working condition of target core cylinder;Get the equivalent external pressure that the outer wall of outer cylinder bears under the winding effect;Based on the physical and geometric characteristics between the inner cylinder and the outer cylinder, determine a plurality of comprehensive influence coefficients for correcting the buckling limit;Combine the structural parameters, material parameters and a plurality of comprehensive influence coefficients, establish the limit state equation of the core cylinder, calculate the buckling limit load of the target core cylinder under the action of pre-stressed steel wire winding without instability;Calculate the ratio of buckling limit load and equivalent external pressure, compare the ratio with the preset safety factor, judge whether the target core cylinder will occur buckling failure.The present application realizes the accurate evaluation of the buckling failure of the double-layer cylinder wall core cylinder structure of the hot isostatic pressing equipment.

Description

Technical Field

[0001] This invention relates to the field of hot isostatic pressing equipment design and manufacturing technology, specifically a method for determining buckling failure of a prestressed steel wire wound core cylinder used in hot isostatic pressing equipment. Background Technology

[0002] Hot isostatic pressing (HIP) technology, through the synergistic effect of high temperature and high pressure, can effectively achieve material densification, internal defect healing, and comprehensive mechanical property optimization. It has become an indispensable core manufacturing process in cutting-edge fields such as aerospace, nuclear energy equipment, high-end medical devices, and additive manufacturing. In HIP equipment, the prestressed steel wire wound core cylinder is the core pressure-bearing component that ensures the safe and stable operation of the equipment under extreme high temperature and high pressure environments.

[0003] In the design of hot isostatic pressing (HIP) equipment, the preload factor of the core cylinder is greater than 1.0, and the preload condition is the most dangerous, with the main failure mode being external pressure buckling failure. However, current research and design methods for external pressure buckling failure of pressure vessels, both domestically and internationally, mostly focus on single-wall structures, leaving a significant gap in methods for determining buckling failure of such special double-wall structures. In current engineering design practice, designers typically use elasticity theory to simply equate the double-walled structure to a single-walled structure, and then use the classic Bressé-Bryan formula to approximate the calculation based on the core cylinder's mid-diameter to obtain the ultimate external pressure without instability. While this approach has some engineering feasibility, there is an inevitable deviation between its theoretical calculation model and the actual physical boundaries and stress state of the core cylinder. For HIP equipment facing extremely harsh service conditions, the evaluation results based on idealized simplification cannot accurately reflect the ultimate bearing capacity of the structure under actual pressure, potentially leading to hidden problems in the equipment's reliability assessment.

[0004] In summary, traditional simplified calculation methods are insufficient to meet the stringent structural safety requirements of high-end hot isostatic pressing (HIP) equipment. Therefore, a more practical analytical approach is urgently needed to accurately determine whether prestressed wire-wound core cylinders used in HIP equipment will buckle under pre-tensioned conditions. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this invention provides a method for determining the buckling failure of a prestressed steel wire wound core cylinder for hot isostatic pressing equipment. Under the condition of fully considering the influence of factors such as the interlayer gap of the double-layer cylinder wall, slip effect, and structural characteristics of the cooling tank, the method achieves accurate assessment of the buckling failure of the double-layer cylinder core cylinder structure for hot isostatic pressing equipment.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention discloses a method for determining buckling failure of a prestressed steel wire wound core cylinder used in hot isostatic pressing equipment, comprising the following steps:

[0008] S1. Obtain the structural parameters, material parameters, and winding parameters of the prestressed steel wire of the target core cylinder; the target core cylinder has a double-wall structure, including an inner cylinder, an outer cylinder, and a cooling groove disposed between the inner and outer cylinder layers;

[0009] S2. Based on the winding parameters and the selected prestressed steel wire winding method, determine the inner cylinder radius deformation value caused by the winding operation under the pre-tightening condition of the target core cylinder;

[0010] S3. Based on the inner cylinder radius deformation value, determine the circumferential stress on the inner wall of the inner cylinder, and based on the circumferential stress and the radial dimension ratio of the target core cylinder, calculate the equivalent external pressure borne by the outer wall of the outer cylinder under the winding action.

[0011] S4. Based on the physical and geometric properties between the inner and outer cylinders, determine several comprehensive influence coefficients for correcting the buckling limit, including: the comprehensive influence coefficient of interlayer friction reflecting the anti-slip capability between the inner and outer cylinders, the comprehensive influence coefficient of interlayer gap reflecting the weakening effect of the assembly gap between the inner and outer cylinders, and the comprehensive influence coefficient of interlayer slotting reflecting the influence of the geometry of the cooling groove on the strength.

[0012] S5. By combining structural parameters, material parameters and multiple comprehensive influence coefficients, the limit state equation of the double-walled core cylinder is established, and the buckling limit load under the prestressed steel wire winding action is calculated to prevent the target core cylinder from buckling.

[0013] S6. Calculate the ratio of the buckling limit load to the equivalent external pressure, compare the ratio with a preset safety factor, and determine whether the target core cylinder will buckle failure based on the comparison result.

[0014] As a further improvement to the above scheme, in step S5, the limit state equation for the buckling ultimate load is calculated as follows:

[0015] ;

[0016] In the formula, Indicates the buckling limit load; In order, they are the comprehensive influence coefficients of interlayer friction, interlayer gap, and interlayer grooving; Let be the inner radius of the target core cylinder; The outer radius of the target core cylinder; Young's modulus of the core material; is the Poisson's ratio of the core material.

[0017] As a further improvement to the above scheme, in step S6, the safety factor is not less than 2.4; if the ratio of the buckling limit load to the equivalent external pressure is greater than or equal to the safety factor, it is determined that the target core will not buckle failure under the cooling medium cooling environment of the cooling tank; otherwise, it is determined that the target core will buckle failure.

[0018] As a further improvement to the above scheme, in step S2, the winding method is equal tension winding, equal shear stress winding, or equal shear stress winding.

[0019] The inner cylinder radius deformation value is a pre-designed value obtained by prestressing steel wire winding using a core cylinder structure in a hot isostatic pressing equipment; or a theoretical value obtained by analytical calculation based on the change of stress in the steel wire with radius when the prestressed steel wire winding operation is completed.

[0020] ;

[0021] In the formula, This represents the deformation value of the inner cylinder radius. Let be the inner radius of the target core cylinder; The outer radius of the target core cylinder; The outer radius of the core tube after the winding operation is completed; Young's modulus of the core material; This is the stress distribution function in the steel wire when the winding operation is completed. For radius coordinates; if constant shear stress winding is used, The formula for expressing it is:

[0022] ;

[0023] In the formula, This refers to the allowable stress of the steel wire. Design the internal pressure for the target core cylinder.

[0024] As a further improvement to the above scheme, in step S3, the formula for calculating the circumferential stress on the inner wall of the inner cylinder is:

[0025] ;

[0026] The formula for calculating the equivalent external pressure borne by the outer wall of the outer cylinder under the winding action is as follows:

[0027] ;

[0028] In the formula, This refers to the equivalent external pressure borne by the outer wall of the outer cylinder under the winding action; This represents the circumferential stress acting on the inner wall of the inner cylinder. The ratio of the outer radius to the inner radius of the target core cylinder.

[0029] As a further improvement to the above scheme, in step S4, the method for determining the comprehensive influence coefficient of interlayer friction includes:

[0030] The maximum static friction coefficient between the inner and outer cylinder walls is obtained, and the interlayer friction comprehensive influence coefficient is positively correlated with the maximum static friction coefficient; when the maximum static friction coefficient is not greater than a preset static friction threshold, the interlayer friction comprehensive influence coefficient is linearly related to the maximum static friction coefficient; when the maximum static friction coefficient is greater than the preset static friction threshold, the interlayer friction comprehensive influence coefficient takes a preset maximum constant coefficient.

[0031] As a further improvement to the above scheme, in step S4, the method for determining the comprehensive influence coefficient of the interlayer gap includes:

[0032] The radial clearance during the assembly of the inner and outer cylinders is obtained, and the comprehensive influence coefficient of the interlayer clearance is negatively correlated with the radial clearance. Within the effective assembly tolerance range, the comprehensive influence coefficient of the interlayer clearance is obtained by applying a linear penalty to the radial clearance and calculating the attenuation.

[0033] As a further improvement to the above scheme, the grooving form of the cooling groove adopts a rectangular cross-section full-circumferential annular groove or a spiral groove; in step S4, the method for determining the comprehensive influence coefficient of the interlayer grooving includes:

[0034] Obtain the depth and width of the cooling tank, as well as the total wall thickness of the inner and outer cylinders, and determine whether the ratio of the slotted cross-section of the cooling tank meets the limited local structural constraint requirements. If the requirements are met, the tank depth is classified according to its proportion in the total wall thickness. The smaller the proportion, the greater the comprehensive influence coefficient of the interlayer slotting.

[0035] The present invention also discloses a computer terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the buckling failure determination method for a prestressed steel wire wound core cylinder for a hot isostatic pressing device as described above.

[0036] The present invention also discloses a computer-readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the steps of the buckling failure determination method for a prestressed steel wire wound core cylinder of a hot isostatic pressing equipment as described above are implemented.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] This invention addresses the unique double-walled structure of the core cylinder in hot isostatic pressing (HIP) equipment. It fully considers the influence of interlayer gaps, interface slip effects, and cooling tank structure on the critical buckling bearing capacity of the core cylinder under external pressure. A limit state equation for buckling failure of the core cylinder structure under prestressed steel wire winding is established, the ultimate load for buckling failure of the metal core cylinder structure is accurately calculated, and a criterion for determining whether the core cylinder structure of HIP equipment will not experience buckling failure is given. This invention has significant guiding significance and application value for the assessment of buckling failure of core cylinder structures in HIP equipment. Attached Figure Description

[0039] Figure 1 This is a flowchart of the buckling failure determination method for a prestressed steel wire wound core cylinder used in a hot isostatic pressing equipment in Embodiment 1 of the present invention.

[0040] Figure 2 This is a simplified structural diagram of the core cylinder used in the hot isostatic pressing equipment in Embodiment 1 of the present invention.

[0041] Figure 3 This is a symbolic diagram illustrating the prestressed steel wire wound core cylinder in Embodiment 1 of the present invention.

[0042] Figure 4 This is a radial deformation distribution cloud map (load scale factor = 0.46562) of the core cylinder in the elastoplastic buckling analysis of Embodiment 2 of the present invention.

[0043] Figure 5 The load-deformation curves for the elastoplastic buckling analysis of the core cylinder in Embodiment 2 of the present invention are shown.

[0044] Figure 6 This is a schematic diagram of the structure of the computer terminal in Embodiment 3 of the present invention. Detailed Implementation

[0045] 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.

[0046] Example 1

[0047] Please see Figure 1 This embodiment provides a method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment, including steps S1 to S6.

[0048] S1. Obtain the structural parameters, material parameters, and winding parameters of the prestressed steel wire of the target core cylinder; the target core cylinder has a double-walled structure, including an inner cylinder, an outer cylinder, and a cooling groove disposed between the inner and outer cylinder layers.

[0049] It should be noted that the target core cylinder refers to the pressure-bearing cylinder of a thermostatic pressure device that is to undergo parameter analysis, stress calculation, and structural safety assessment in the current buckling failure design and judgment process.

[0050] In this embodiment, the structural parameters, material parameters, and winding parameters of the prestressed steel wire of the target core cylinder are all summarized as basic information of the target core cylinder structure, including the inner radius of the core cylinder. outer radius of the core tube The outer radius of the core after the winding operation is completed The inner wall thickness of the core cylinder Core outer wall thickness The ratio of the outer diameter to the inner diameter of the core cylinder Radial gap between the inner and outer cylinders Cooling tank depth Cooling tank width Young's modulus of core material Poisson's ratio of the core material Allowable stress of steel wire A simplified diagram of the core cylinder structure is shown below. Figure 2 As shown.

[0051] S2. Based on the winding parameters and the selected prestressed steel wire winding method, determine the inner cylinder radius deformation value caused by the winding operation under the pre-tightening condition of the target core cylinder.

[0052] The winding method includes constant tension winding, constant shear stress winding, or constant shear stress winding, with constant shear stress winding being preferred. The stress in the steel wire at the end of the winding operation is... And assume that the stress is a radial coordinate. functions, such as Figure 3 As shown, the inner cylinder radius deformation value The expression is:

[0053] ;

[0054] It should be noted that S2 only includes the prestressed steel wire winding load, without internal pressure load, meaning the core cylinder is in a pre-tightened state. Under this condition, the inner cylinder radius deformation value δ is obtained. The constant shear stress winding method is currently the most advanced and commonly used winding method. If constant shear stress winding is used... The formula for expressing it is:

[0055] ;

[0056] In the formula, Design the internal pressure for the target core cylinder.

[0057] In some embodiments, the inner cylinder radius deformation value is a pre-designed value obtained by prestressing steel wire winding using a core cylinder structure in a hot isostatic pressing apparatus.

[0058] S3. Based on the inner cylinder radius deformation value, determine the circumferential stress on the inner wall of the inner cylinder, and based on the circumferential stress and the radial dimension ratio of the target core cylinder, calculate the equivalent external pressure borne by the outer wall of the outer cylinder under the winding action.

[0059] Circumferential stress on the inner wall of the inner cylinder The calculation formula is:

[0060] ;

[0061] The equivalent external pressure borne by the outer wall of the outer cylinder under the winding action The calculation formula is:

[0062] .

[0063] S4. Based on the physical and geometric properties between the inner and outer cylinders, determine multiple comprehensive influence coefficients used to correct the buckling limit. The specific process includes S41~S43.

[0064] S41. Calculate the comprehensive influence coefficient of interlayer friction. , Used to reflect the maximum static friction coefficient between the inner and outer walls of the core cylinder. The effect on the buckling ultimate load of the core cylinder. When hour, Values ​​can be taken from Table 1. The interpolation values ​​between the column values ​​in Table 1 can be obtained by linear interpolation or by... Obtained through calculation. hour, Take 1.0.

[0065] Table 1: Comprehensive Influence Coefficient of Interlayer Friction

[0066]

[0067] S42. Calculate the comprehensive influence coefficient of interlayer gaps. , Used to characterize the radial interlayer gap between the inner and outer cylinder walls. The effect on the buckling ultimate load of the core cylinder. When 0.3 ≥ When ≥0, Values ​​can be taken from Table 2. The interpolation values ​​between the column values ​​in Table 2 can be obtained using linear interpolation. Not recommended. >0.3, if If the result is greater than 0.3, this method should still be used, but other reliable methods, including but not limited to numerical simulation, should be used to verify the result.

[0068] Table 2: Comprehensive Influence Coefficient of Interlayer Gap

[0069]

[0070] S43. Calculate the comprehensive influence coefficient of interlayer slotting (cooling groove). In this embodiment, the slotting form must be a full-circumferential annular groove or a spiral groove with a rectangular (including square) cross-section. When , And when the total width of the slot does not exceed 50% of the effective length of the inner cylinder, ;when , And when the total width of the slot does not exceed 50% of the effective length of the inner cylinder, =0.8.

[0071] S5. By combining structural parameters, material parameters, and multiple comprehensive influence coefficients, the limit state equation of the double-walled core cylinder structure is established. The buckling limit load under prestressed steel wire winding is calculated to ensure that the target core cylinder does not buckle. The limit state equation is as follows:

[0072] ;

[0073] In the formula, This represents the buckling limit load. It should be noted that this equation applies only to materials used in metallic pressure vessels; it is not applicable to other materials.

[0074] S6. Calculate the ratio of the buckling limit load to the equivalent external pressure. The ratio is compared with a preset safety factor, and the result of the comparison is used to determine whether the target core will buckle failure.

[0075] The safety factor shall be no less than 2.4; if the ratio of the buckling limit load to the equivalent external pressure is greater than or equal to the safety factor, it shall be determined that the target core cylinder will not buckle failure under the cooling medium cooling environment of the cooling tank (the core cylinder temperature shall not exceed 100°C after the cooling medium cooling environment of the cooling tank), otherwise it shall be determined that the target core cylinder will buckle failure.

[0076] Example 2

[0077] This embodiment takes a specific model of core cylinder as an example to calculate and verify the buckling failure determination method of the prestressed steel wire wound core cylinder of the hot isostatic pressing equipment in Embodiment 1.

[0078] First, determine the basic information of the core cylinder structure used in hot isostatic pressing equipment: the inner radius of the core cylinder. =500mm, outer radius of core cylinder =625mm, outer radius of the core cylinder after winding operation =793mm, inner wall thickness of the core cylinder =62.5mm, outer wall thickness of core cylinder =62.5mm, core height H=2500mm, ratio of outer diameter to inner diameter =1.25, cooling tank depth h=15mm, cooling tank width b=24mm, pitch 50mm, core cylinder design internal pressure =210MPa, Young's modulus of core material E=2.0×10 5 MPa, Poisson's ratio =0.3, static friction coefficient between inner and outer cylinder walls Radial gap between inner and outer cylinder walls mm, allowable stress of steel wire =783MPa.

[0079] Then, the winding method for the core cylinder structure of the hot isostatic pressing equipment was determined, using constant shear stress winding, and the inner cylinder radius deformation value δ was obtained:

[0080] ;

[0081] in, .

[0082] The calculation yielded the following results: =-0.90mm.

[0083] In this embodiment, after the shear winding of the prestressed steel wires in the core cylinder is completed, the center position of the core cylinder is... The measured value is -0.88 mm, which is within 5% of the analytical value. This embodiment selects the analytical value, but the measured value can also be used in actual engineering applications.

[0084] Depend on The circumferential stress of the inner wall of the core cylinder structure used in hot isostatic pressing equipment was calculated. ,Right now:

[0085] ;

[0086] Depend on Calculate the actual equivalent external pressure borne by the outer wall of the core cylinder structure for hot isostatic pressing equipment. .

[0087] ;

[0088] Calculate the comprehensive influence coefficient of interlayer friction , Take values ​​according to Table 1. hour, .

[0089] Calculate the comprehensive influence coefficient of interlayer gaps , Take the values ​​from Table 2. When mm, .

[0090] Calculate the overall influence coefficient of interlayer slotting (cooling tank) , , Based on the calculations of the slot width and pitch, it can be seen that the total width of the slots accounts for 48% of the effective length of the cylinder and does not exceed 50% of the effective length of the inner cylinder. .

[0091] From the limit state equation for buckling failure of the core cylinder structure used in hot isostatic pressing equipment under prestressed steel wire winding, the ultimate load for buckling failure of the core cylinder can be obtained as follows:

[0092] ;

[0093] The ultimate load for buckling failure of the core cylinder was also compared using finite element elastoplastic buckling analysis, such as... Figure 4 and Figure 5 As shown, under the same conditions, the finite element model of the core cylinder experiences elastoplastic buckling failure when the equivalent external pressure is applied to 46.56% of the target external pressure of 500 MPa. That is, the ultimate load for the buckling failure of the core cylinder is 232.8 MPa, and the relative error with the analytical value of the present invention is 1.8%, which proves the accuracy of the present invention and the feasibility of avoiding finite element calculation.

[0094] The criteria for determining whether the core cylinder structure used in hot isostatic pressing equipment will not experience buckling failure are as follows:

[0095] =228.7 / 64.1=3.56>2.4.

[0096] Example 3

[0097] This embodiment provides a computer terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the buckling failure determination method for prestressed steel wire wound core cylinders for hot isostatic pressing equipment as described in Embodiment 1.

[0098] like Figure 6 As shown, the computer terminal provided in this embodiment includes: at least one processor 101, and a memory 102 connected to at least one processor 101. This embodiment does not limit the specific connection medium between the processor 101 and the memory 102. Figure 6 The example shown is the connection between processor 101 and memory 102 via bus 100. Bus 100 is... Figure 6The connections between other components are shown in bold lines and are for illustrative purposes only, not as limiting information. Bus 100 can be divided into address bus, data bus, control bus, etc., for ease of representation. Figure 6 The bus is represented by a single thick line, but this does not indicate that there is only one bus or one type of bus. Alternatively, the processor 101 may also be called a controller; there is no restriction on the name.

[0099] In this embodiment, the memory 102 stores instructions that can be executed by at least one processor 101. The at least one processor 101 can execute the aforementioned method by executing the instructions stored in the memory 102.

[0100] The processor 101 is the control center of the device. It can connect to various parts of the control device through various interfaces and lines. By running or executing instructions stored in memory 102 and calling data stored in memory 102, the processor can perform various functions and process data, thereby monitoring the device as a whole.

[0101] In one possible design, processor 101 may include one or more processing units. Processor 101 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, and the modem processor mainly handles wireless communication. It is understood that the modem processor may also not be integrated into processor 101. In some embodiments, processor 101 and memory 102 may be implemented on the same chip; in some embodiments, they may also be implemented on separate chips.

[0102] Processor 101 can be a general-purpose processor, such as a central processing unit (CPU), digital signal processor, application-specific integrated circuit, field-programmable gate array or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the buckling failure determination method for prestressed steel wire wound core cylinders in hot isostatic pressing equipment disclosed in Embodiment 1 can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules in processor 101.

[0103] Memory 102, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. Memory 102 may include at least one type of storage medium, such as flash memory, hard disk, multimedia card, card-type memory, random access memory (RAM), static random access memory (SRAM), programmable read-only memory (PROM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic storage, magnetic disk, optical disk, etc. Memory 102 can be any other medium capable of carrying or storing desired program code in the form of instructions or data structures that can be accessed by a computer, but is not limited thereto. In this embodiment, memory 102 can also be a circuit or any other device capable of implementing storage functions for storing program instructions and / or data.

[0104] By designing and programming the processor 101, the code corresponding to the buckling failure determination method for the hot isostatic pressing equipment with prestressed steel wire wound core cylinder described in the foregoing embodiments can be embedded into the chip, thereby enabling the chip to execute the code during operation. Figure 1 The steps of the buckling failure determination method for a prestressed steel wire wound core cylinder in a hot isostatic pressing apparatus are shown. How to design and program the processor 101 is a technique well-known to those skilled in the art and will not be described further here.

[0105] Example 4

[0106] This embodiment provides a computer-readable storage medium storing a computer program thereon. When the program is executed by a processor, it implements the steps of the buckling failure determination method for a prestressed steel wire wound core cylinder used in a hot isostatic pressing device as described in Embodiment 1.

[0107] The computer-readable storage medium may include flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the storage medium may be an internal storage unit of a computer device, such as the hard disk or memory of the computer device. In other embodiments, the storage medium may also be an external storage device of the computer device, such as a plug-in hard disk, smart memory card, secure digital card, flash memory card, etc., provided on the computer device. Of course, the storage medium may include both internal storage units and external storage devices of the computer device. In this embodiment, the memory is typically used to store the operating system and various application software installed on the computer device. In addition, the memory can also be used to temporarily store various types of data that have been output or will be output.

[0108] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for determining buckling failure of prestressed steel wire wound core cylinders used in hot isostatic pressing equipment, characterized in that, Including the following steps: S1. Obtain the structural parameters, material parameters, and winding parameters of the prestressed steel wire of the target core cylinder; the target core cylinder has a double-wall structure, including an inner cylinder, an outer cylinder, and a cooling groove disposed between the inner and outer cylinder layers; S2. Based on the winding parameters and the selected prestressed steel wire winding method, determine the inner cylinder radius deformation value caused by the winding operation under the pre-tightening condition of the target core cylinder; S3. Based on the inner cylinder radius deformation value, determine the circumferential stress on the inner wall of the inner cylinder, and based on the circumferential stress and the radial dimension ratio of the target core cylinder, calculate the equivalent external pressure borne by the outer wall of the outer cylinder under the winding action. S4. Based on the physical and geometric properties between the inner and outer cylinders, determine several comprehensive influence coefficients for correcting the buckling limit, including: the comprehensive influence coefficient of interlayer friction reflecting the anti-slip capability between the inner and outer cylinders, the comprehensive influence coefficient of interlayer gap reflecting the weakening effect of the assembly gap between the inner and outer cylinders, and the comprehensive influence coefficient of interlayer slotting reflecting the influence of the geometry of the cooling groove on the strength. S5. By combining structural parameters, material parameters and multiple comprehensive influence coefficients, the limit state equation of the double-walled core cylinder is established, and the buckling limit load under the prestressed steel wire winding action is calculated to prevent the target core cylinder from buckling. S6. Calculate the ratio of the buckling limit load to the equivalent external pressure, compare the ratio with a preset safety factor, and determine whether the target core cylinder will buckle failure based on the comparison result.

2. The method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment according to claim 1, characterized in that, In step S5, the limit state equation for the buckling ultimate load is calculated as follows: In the formula, Indicates the buckling limit load; In order, they are the comprehensive influence coefficients of interlayer friction, interlayer gap, and interlayer grooving; Let be the inner radius of the target core cylinder; The outer radius of the target core cylinder; Young's modulus of the core material; is the Poisson's ratio of the core material.

3. The method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment according to claim 2, characterized in that, In step S6, the safety factor is not less than 2.4; if the ratio of the buckling limit load to the equivalent external pressure is greater than or equal to the safety factor, it is determined that the target core will not buckle failure under the cooling medium cooling environment of the cooling tank; otherwise, it is determined that the target core will buckle failure.

4. The method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment according to claim 1, characterized in that, In step S2, the winding method is equal tension winding, equal shear stress winding, or equal shear stress winding; The inner cylinder radius deformation value is a pre-designed value obtained by prestressing steel wire winding using a core cylinder structure in a hot isostatic pressing equipment; or a theoretical value obtained by analytical calculation based on the change of stress in the steel wire with radius when the prestressed steel wire winding operation is completed. In the formula, This represents the deformation value of the inner cylinder radius. Let be the inner radius of the target core cylinder; The outer radius of the target core cylinder; The outer radius of the core tube after the winding operation is completed; Young's modulus of the core material; This is the stress distribution function in the steel wire when the winding operation is completed. For radius coordinates; if constant shear stress winding is used, The formula for expressing it is: In the formula, This refers to the allowable stress of the steel wire. Design the internal pressure for the target core cylinder.

5. The method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment according to claim 4, characterized in that, In step S3, the formula for calculating the circumferential stress on the inner wall of the inner cylinder is: The formula for calculating the equivalent external pressure borne by the outer wall of the outer cylinder under the winding action is as follows: In the formula, This refers to the equivalent external pressure borne by the outer wall of the outer cylinder under the winding action; This represents the circumferential stress acting on the inner wall of the inner cylinder. The ratio of the outer radius to the inner radius of the target core cylinder.

6. The method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment according to claim 1, characterized in that, In step S4, the method for determining the comprehensive influence coefficient of interlayer friction includes: The maximum static friction coefficient between the inner and outer cylinder walls is obtained, and the interlayer friction comprehensive influence coefficient is positively correlated with the maximum static friction coefficient; when the maximum static friction coefficient is not greater than a preset static friction threshold, the interlayer friction comprehensive influence coefficient is linearly related to the maximum static friction coefficient; when the maximum static friction coefficient is greater than the preset static friction threshold, the interlayer friction comprehensive influence coefficient takes a preset maximum constant coefficient.

7. The method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment according to claim 1, characterized in that, In step S4, the method for determining the comprehensive influence coefficient of the interlayer gap includes: The radial clearance during the assembly of the inner and outer cylinders is obtained, and the comprehensive influence coefficient of the interlayer clearance is negatively correlated with the radial clearance. Within the effective assembly tolerance range, the comprehensive influence coefficient of the interlayer clearance is obtained by applying a linear penalty to the radial clearance and calculating the attenuation.

8. The method for determining buckling failure of a prestressed steel wire wound core cylinder for a hot isostatic pressing equipment according to claim 1, characterized in that, The cooling groove is a rectangular cross-section full-circumferential annular groove or a spiral groove. In step S4, the method for determining the comprehensive influence coefficient of interlayer slotting includes: Obtain the depth and width of the cooling tank, as well as the total wall thickness of the inner and outer cylinders, and determine whether the ratio of the slotted cross-section of the cooling tank meets the limited local structural constraint requirements. If the requirements are met, the tank depth is classified according to its proportion in the total wall thickness. The smaller the proportion, the greater the comprehensive influence coefficient of the interlayer slotting.

9. A computer terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the buckling failure determination method for prestressed steel wire wound core cylinders used in hot isostatic pressing equipment as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the buckling failure determination method for prestressed steel wire wound core cylinders used in hot isostatic pressing equipment as described in any one of claims 1 to 8.

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