A method and system for designing a composite bell thickness of a bell-and-spigot pipe fitting

Abstract

The application provides a composite socket thickness design method and system of a socket pipe, and belongs to the technical field of fluid conveying pipeline structure design and mechanical calculation. The method comprises the following steps: performing multi-field coupling superposition analysis on the force borne by the composite socket of the socket pipe to generate multi-field coupling load distribution data; performing socket full-section stress gradient scanning on the multi-field coupling load distribution data to generate socket stress non-uniform distribution atlas data; through the point-by-point analysis of the multi-field coupling load and the stress gradient scanning, the spatial positions of the high stress concentration area and the low stress redundancy area on the full section of the socket can be accurately locked, the old problems that the wall thickness of the high stress area is still insufficient and the material of the low stress area is seriously stacked due to the traditional uniform thickening are fundamentally changed, the material consumption is reduced by 20-30 percent, and the safety margin of the bottom of the sealing ring groove is greatly improved.

Description

Technical Field

[0001] This invention proposes a method and system for designing the composite socket thickness of socket-type pipe fittings, belonging to the field of fluid transportation pipeline structure design and mechanical calculation technology. Background Technology

[0002] Socket-type pipe fittings, as core connecting components of underground pipe networks, are widely used in pipe systems such as fiberglass pipes, composite pipes, and cast iron pipes. They achieve a sealed connection by inserting a straight pipe into a socket and using a sealing ring. The wall thickness of the socket directly affects the structural safety and sealing reliability of the pipe fitting during its service life, and has always been a key aspect of pipe fitting structural design.

[0003] The current industry practice is to simplify the socket as a thick-walled cylindrical model under internal pressure, calculate the minimum wall thickness according to the third or fourth strength theory, and then multiply it by an empirical safety factor of 1.5 to 2.0 for global uniform thickening. This approach does not consider the multi-field coupled conditions actually experienced by the socket—internal pressure, radial interference force of the sealing ring, axial thrust of the spigot, and bending stress caused by foundation settlement acting simultaneously. This results in extremely uneven stress distribution, severe stress concentration at the bottom of the sealing ring groove, while the edge of the socket end is almost stress-free. Uniform thickening still results in insufficient thickness in high-stress areas and serious waste of material in low-stress areas.

[0004] For composite pipe fittings such as glass fiber reinforced plastics, existing methods only specify the macroscopic wall thickness, while the internal layup uses a uniform thickness annular cross-wound, completely separating the macroscopic and microscopic dimensions. At locations where the stress flow direction changes abruptly at the socket root, the uniform thickness layup is highly susceptible to delamination failure due to transverse shear stress, rendering the axial tensile strength advantage of the fibers ineffective. More importantly, the polymer matrix undergoes viscoelastic creep and stress relaxation during long-term service. The interference force of the sealing ring causes progressive creep expansion of the socket inner wall, with the initial interference continuously decreasing, ultimately leading to seal failure. Traditional static thickness design cannot anticipate or compensate for this structural distortion over time. Summary of the Invention

[0005] This invention provides a method and system for designing the composite socket thickness of socket-type pipe fittings, in order to solve the problems mentioned in the background art above: This invention proposes a method for designing the composite socket thickness of socket-type pipe fittings, the method comprising: S1. Perform multi-field coupling superposition analysis on the force borne by the composite socket of the socket-type pipe fitting to generate multi-field coupling load distribution data; perform full-section stress gradient scanning on the multi-field coupling load distribution data to generate non-uniform stress distribution spectrum data of the socket. S2. Perform macroscopic topological streamline optimization on the non-uniform stress distribution map data of the socket to generate macroscopic topological streamline distribution data; perform thickness inverse mapping on the macroscopic topological streamline distribution data to convert the streamline density gradient into the target thickness value of each region of the socket, forming non-uniform initial thickness distribution data that decreases from the high stress region to the low stress region. S3. Perform micro-composite gradient matching processing on the non-uniform thickness initial distribution data to generate micro-layup gradient configuration data; check the interlaminar shear stress and transverse tensile strength of the micro-layup gradient configuration data to generate composite gradient matching verification data. S4. Perform time-varying creep compensation processing on the composite gradient matching verification data to generate time-varying creep deformation prediction data; perform thickness dynamic compensation superposition on the time-varying creep deformation prediction data, superimpose the creep decay compensation amount that increases with time on the non-uniform initial thickness distribution to generate time-varying compensated thickness distribution data. S5. Perform multi-objective constraint convergence processing on the time-varying compensation thickness distribution data, perform joint optimization solution, and generate Pareto optimal thickness scheme set data; perform full life cycle structural performance evaluation on the Pareto optimal thickness scheme set data, and output the final thickness distribution result of the composite socket.

[0006] This invention proposes a composite socket thickness design system for socket-type pipe fittings, the system comprising: One or more processors; Memory, used to store one or more programs; Wherein, when the one or more programs are executed by the one or more processors, the one or more processors are made to implement the method described in any one of the above.

[0007] The beneficial effects of this invention are as follows: By analyzing and scanning stress gradients through multi-field coupled loads point by point, the spatial locations of high-stress concentration areas and low-stress redundancy areas can be accurately located across the entire cross-section of the socket. This fundamentally changes the old problems of insufficient wall thickness in high-stress areas and severe material accumulation in low-stress areas caused by traditional uniform thickening. While reducing material usage by 20% to 30%, the safety margin at the bottom of the sealing ring groove is significantly improved. The combined application of macroscopic topological streamline optimization and microscopic layup gradient matching allows the layup angle and fiber volume fraction in the area where the stress flow direction at the socket root deflects sharply to follow the stress field. This fully releases the axial tensile strength advantage of the fibers and avoids delamination failure caused by transverse shear stress in uniform-thickness annular layups, substantially enhancing the load-bearing efficiency of the composite structure. The time-varying creep compensation mechanism incorporates the viscoelastic creep of the polymer matrix and the relaxation of the sealing ring interference force into the thickness design considerations. It can predict and compensate for the progressive creep expansion of the inner wall of the socket throughout the entire service life, avoiding sealing failure caused by the continuous decay of the initial interference force, and significantly extending the actual service life of the pipe fittings. Multi-objective constraint convergence processing minimizes material redundancy while maintaining structural safety, and the addition of manufacturing process feasibility constraints allows the solution to be directly implemented in production, avoiding repeated rework caused by the disconnect between design and manufacturing. Attached Figure Description

[0008] Figure 1 This is a diagram illustrating the steps of the method described in this invention; Figure 2 This is a detailed flowchart of step S3 in this invention. Detailed Implementation

[0009] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0010] One embodiment of the present invention, such as Figure 1 As shown, a method for designing the composite socket thickness of a socket-type pipe fitting includes: S1. Perform multi-field coupling superposition analysis on the forces borne by the composite socket of the socket-type pipe fitting. The forces include internal pressure load, radial interference force of the sealing ring, axial thrust of the socket, and bending stress due to foundation settlement, and generate multi-field coupled load distribution data. Perform stress gradient scanning of the entire cross section of the socket on the multi-field coupled load distribution data, identify the high stress concentration area at the bottom of the sealing ring groove and the low stress redundancy area at the edge of the socket end and mark their spatial coordinates, and generate non-uniform stress distribution map data of the socket. S2. Perform macroscopic topological streamline optimization on the non-uniform stress distribution map data of the socket, and use the principal stress tracing algorithm to generate material distribution streamlines in the socket section that are consistent with the stress flow direction, thus generating macroscopic topological streamline distribution data; perform thickness inverse mapping on the macroscopic topological streamline distribution data, and convert the streamline density gradient into the target thickness value of each region of the socket, forming non-uniform initial thickness distribution data that decreases from the high stress region to the low stress region. S3. Perform micro-composite gradient matching processing on the non-uniform thickness initial distribution data. For the region where the stress flow direction deflects sharply at the socket root, perform gradient arrangement of ply angle and fiber volume fraction to generate micro-ply gradient configuration data. Check the interlaminar shear stress and transverse tensile strength of the micro-ply gradient configuration data to eliminate the risk of delamination failure caused by uniform thickness ring ply and generate composite gradient matching verification data. S4. Perform time-varying creep compensation processing on the composite gradient matching verification data. Introduce the viscoelastic creep constitutive model of the polymer matrix and the relaxation evolution curve of the sealing ring interference force to predict the progressive creep expansion of the inner wall of the socket in the whole service cycle, and generate time-varying creep deformation prediction data. Perform thickness dynamic compensation superposition on the time-varying creep deformation prediction data. Superimpose the creep decay compensation amount that increases with time on the non-uniform initial thickness distribution to generate time-varying compensated thickness distribution data. S5. Perform multi-objective constraint convergence processing on the time-varying compensation thickness distribution data, and jointly optimize and solve the structural safety constraints, material usage constraints, and manufacturing process feasibility constraints to generate Pareto optimal thickness scheme set data; perform full life cycle structural performance evaluation on the Pareto optimal thickness scheme set data, and output the final thickness distribution result of the socket composite socket.

[0011] The working principle and effects of the above technical solution are as follows: By performing multi-field coupling analysis and stress gradient scanning on the various forces borne by the socket, high stress concentration and low stress redundancy areas are accurately identified, improving the accuracy of socket thickness design and enhancing the targeted nature of structural load-bearing. Through macroscopic topological streamline optimization and microscopic composite gradient matching, material distribution and layup configuration are optimized, reducing the amount of composite materials used, minimizing material waste and production costs, and reducing the risk of interlayer delamination failure. Through time-varying creep compensation and multi-objective constraint convergence optimization, the problems of stress imbalance and excessive creep deformation in traditional designs are avoided, preventing socket damage and leakage during service due to design defects. Through multi-dimensional optimization throughout the entire process, the structural safety of the socket throughout its entire life cycle is ensured, while also considering manufacturing feasibility, economy, and practicality, further improving the overall service reliability and service life of the pipe fittings.

[0012] In one embodiment of the present invention, S1 includes: S11. Collect parameters of medium internal pressure, sealing ring assembly extrusion deformation, pipeline docking axial extrusion, and foundation uneven settlement deformation under the service conditions of composite socket pipe fittings, integrate the original parameter set of multiple types of mechanical action, and complete the collection of multi-dimensional original stress information. S12. Import the collected multi-dimensional stress original parameter set into the multi-field coupled numerical solution module to complete the field coupling superposition calculation of internal pressure load, radial interference force of sealing ring, axial thrust of socket and foundation settlement bending stress, solve the numerical distribution state of the overall stress field of socket, and generate multi-field coupled load distribution data. S13. Based on the full-domain stress scanning algorithm, perform layer-by-layer progressive stress gradient traversal detection on the full cross section of the socket using multi-field coupled load distribution data, capture the fluctuation and change patterns of stress values ​​at each point of the cross section layer by layer, and lock the key location areas where stress values ​​change abruptly. S14. Divide the key location areas captured during the traversal detection process into regional attributes, and divide the area of ​​peak stress value at the bottom of the sealing ring groove and the area of ​​low redundant stress value at the edge of the socket end. Simultaneously record the point information of the two types of areas in the three-dimensional space of the socket. S15. Integrate the regional attribute division results with three-dimensional spatial point information to complete the graphical reconstruction of the stress distribution state of the entire cross section, fully present the distribution differences of stress intensity in different regions, and generate non-uniform distribution map data of socket stress.

[0013] The working principle and effects of the above technical solution are as follows: By comprehensively collecting and integrating various mechanical parameters under the service conditions of the socket, the integrity and comprehensiveness of the original stress information are ensured, improving the basic reliability of subsequent stress analysis and reducing analysis deviations caused by missing parameters. Through multi-field coupled numerical calculations, the overall stress distribution of the socket is accurately solved, enhancing the accuracy of stress analysis and avoiding the one-sidedness of results caused by single stress analysis. Through full-section layer-by-layer stress gradient detection and key area division, high stress concentration and low stress redundancy areas are accurately identified, avoiding subsequent design deviations caused by inaccurate stress distribution identification. At the same time, three-dimensional point information is recorded, providing a precise basis for subsequent thickness optimization. By graphically reconstructing the stress distribution, the stress differences in each area are clearly presented, allowing staff to intuitively grasp the stress state of the socket and providing clear guidance for subsequent structural optimization, further improving the efficiency and pertinence of the entire design process.

[0014] In one embodiment of the present invention, step S14 includes: Extract data from key locations where stress values ​​change abruptly, analyze the stress value ranges, cross-sectional distribution ranges, and force transmission directions of each key region, and generate basic feature data for the key regions. Import the basic feature data of key areas into the regional attribute identification module, and combine the functional zoning requirements of the socket structure to determine the stress intensity level of each key area, and distinguish between high stress concentration areas and low stress redundancy areas. For the two types of areas identified, positioning detection is carried out to accurately capture the boundary contour of the high stress peak area at the bottom of the sealing ring groove, and at the same time identify the extension range of the low stress redundancy area at the edge of the socket end. The three-dimensional spatial coordinate acquisition module is activated to acquire coordinates of each boundary point and core point in the high stress concentration area and the low stress redundancy area, and to record the three-dimensional spatial coordinate parameters of each point. By integrating the attribute determination results of the two types of regions with the three-dimensional spatial coordinate parameters, a correspondence between regional attributes and spatial location is established, generating point record data containing regional type, distribution range and coordinate information.

[0015] The working principle and effects of the above technical solution are as follows: By analyzing the stress values, distribution range, and transmission direction of key areas, complete basic feature data is generated, improving the accuracy of regional attribute determination and reducing judgment bias caused by missing features. By determining the stress intensity level of key areas, high stress concentration and low stress redundancy areas are accurately distinguished, avoiding subsequent design imbalances caused by confusion between the two types of areas and enhancing the targeting of area division. By accurately capturing the boundary contours and extension ranges of the two types of areas, combined with three-dimensional coordinate acquisition and recording, the accuracy of area positioning is ensured, avoiding the impact of coordinate recording deviations on subsequent optimization work. By integrating attribute determination results with three-dimensional coordinates, a corresponding relationship is established between the two, generating complete point recording data, which not only provides accurate location basis for subsequent thickness optimization but also reduces repeated positioning in subsequent work, improving the efficiency of the entire design process and further ensuring the rationality of the socket structure design.

[0016] In one embodiment of the present invention, S2 includes: S21. Use the non-uniform distribution map data of the socket stress as the basic analysis carrier, extract the stress vector direction and stress numerical gradient change characteristics of each point in the map, and sort out the overall trend of natural stress transmission in the socket section. S22. Run the principal stress tracing algorithm to perform continuous streamline extension fitting along the natural stress transmission trend, and generate multiple continuously arranged material distribution streamlines that are in line with the stress flow direction within the annular cross section of the socket, generating macroscopic topological streamline distribution data. S23. Analyze the differences in the density and arrangement of streamlines within the macroscopic topological streamline distribution data, quantify the hierarchical differences in streamline aggregation density in different regions, and establish the correlation between streamline density and structural load-bearing requirements. S24. Based on the difference in streamline density levels, perform reverse conversion and assignment of thickness parameters for each region of the socket. High stress corresponds to high-density streamline regions and is matched with large thickness parameters, while low stress corresponds to low-density streamline regions and is matched with small thickness parameters. S25. The thickness parameters after being assigned values ​​to each region are smoothly connected to eliminate abrupt changes in thickness values ​​between regions, forming non-uniform initial thickness distribution data that decreases from high stress area to low stress area.

[0017] The working principle and effects of the above technical solution are as follows: By extracting the vector direction and numerical gradient characteristics of the non-uniform stress distribution spectrum, the stress transmission direction is clarified, ensuring the fit of subsequent streamline fitting, improving the reliability of macroscopic topology analysis, and reducing streamline generation errors caused by deviations in stress direction judgment. By fitting material distribution streamlines using the principal stress tracking algorithm, the stress flow direction is accurately matched, avoiding the problem of streamlines not matching actual stress and enhancing the pertinence of material distribution design. By analyzing streamline density differences and establishing a correlation with load-bearing requirements, the thickness parameter is reverse-calculated and assigned, reducing material waste and the consumption of redundant material in low-stress areas. By connecting the thickness parameters of each region to achieve a smooth transition, thickness discontinuities are eliminated, forming a reasonable initial non-uniform thickness distribution, which can both ensure the load-bearing strength of high-stress areas and take into account material economy, further improving the efficiency and rationality of subsequent thickness optimization.

[0018] One embodiment of the present invention, such as Figure 2 As shown, S3 includes: S31. Read the initial distribution data of non-uniform thickness to define the range of each structural partition of the socket, locate the special structural section where the stress flow direction at the root of the socket is significantly bent and deflected, and delineate the key control area of ​​micro-layup. S32. Adjust the inclination angle of composite material layup arrangement layer by layer for key control areas, and simultaneously gradually control the fiber volume ratio inside a single layer. Complete the gradient arrangement of layup parameters along the stress deflection direction to generate micro layup gradient configuration data. S33. Substitute the micro-ply gradient configuration data to perform mechanical calculations of interlayer interactions, solve for the shear force values ​​between the contact surfaces of adjacent ply layers and the tensile limit values ​​of the material's transverse bearing capacity, and obtain the basic mechanical calculation results. S34. Compare the mechanical calculation results of the gradient ply structure with the mechanical performance of the traditional uniform thickness ring ply structure, and compare the interlayer separation development trend of the two types of structures under long-term load. S35. Select configuration schemes in gradient layup structures that meet the long-term service limit requirements for interlaminar shear and transverse tensile strength, avoid the risk of interlaminar delamination damage that is easily caused by uniform thickness annular layup, and generate composite gradient matching verification data.

[0019] The working principle and effects of the above technical solution are as follows: By defining the structural zones of the socket and locking the sections with significant stress deflection, the range of micro-layout control is delineated, improving the accuracy of composite material arrangement adjustment and reducing resource consumption caused by large-scale blind control. By adjusting the layup inclination angle and fiber ratio along the stress deflection direction gradient, the internal material arrangement and stress state are adapted to each other, enhancing the ability of the socket root to resist deformation. By performing interlaminar mechanical calculations to obtain shear and tensile values, the stress state between layups can be accurately reflected, reducing the probability of latent structural damage. By comparing the long-term stress performance with traditional ring layups, the advantages of gradient arrangement are intuitively presented, avoiding structural defects caused by using old arrangement forms. By selecting layup schemes that meet service limits, interlaminar separation failure is prevented in advance, which can adapt to long-term stress changes under complex working conditions and maintain the overall stability of the composite material structure.

[0020] In one embodiment of the present invention, S32 includes: Extract data from the designated micro-layer key control area, obtain the stress deflection angle, stress distribution gradient and structural size parameters of the area, and generate characteristic data of the key control area; Import the characteristic data of the key control area into the ply tilt angle control module, and set the ply tilt angle adjustment increment layer by layer according to the stress deflection direction at the socket root to complete the gradient adjustment of the ply angle of each layer. Simultaneously collect fiber material parameters and matrix ratio parameters of a single layer of composite material, and gradually adjust the fiber volume ratio inside the single layer according to the stress bearing requirements of each layer to achieve fiber distribution and stress matching. By integrating the adjusted ply tilt angle and fiber volume ratio parameters of each layer, the ply parameters of each layer are continuously connected according to the stress deflection direction to avoid structural weak points caused by abrupt parameter changes. The gradient parameter configuration information of all layers is summarized to generate micro-layer gradient configuration data including the tilt angle, fiber ratio and arrangement order of each layer.

[0021] The working principle and effects of the above technical solution are as follows: By extracting the stress deflection angle, distribution gradient, and structural dimensions of key control areas in the micro-layouts, complete feature data is generated, improving the targeting of layup adjustments, reducing adjustment deviations caused by missing parameters, and making the layup configuration more closely match actual stress requirements. By setting the tilt angle adjustment increment layer by layer according to the stress deflection direction, a gradient adjustment of the layup angle is achieved, avoiding structural stress concentration caused by abrupt angle changes and enhancing the structural toughness at the socket root. By simultaneously adjusting the fiber volume ratio, the fiber distribution is precisely matched with the stress bearing requirements of each layer, reducing material performance waste and improving the utilization rate of composite materials. By integrating the parameters of each layer and achieving continuous connection, structural weak points caused by parameter abrupt changes are eliminated, avoiding localized damage during later service. By summarizing all layup parameters to generate configuration data, a complete basis can be provided for subsequent force verification, ensuring the standardization of layup arrangement and further improving the stability and load-bearing reliability of the micro-layup structure.

[0022] In one embodiment of the present invention, S33 includes: Extract the generated micro-layup gradient configuration data, obtain the tilt angle parameters, fiber volume ratio, layup thickness and arrangement order of each layup, and generate a complete parameter set of the layup structure. Import the complete parameter set of the ply structure into the interlayer mechanics calculation module, set the interlayer interaction mechanics solution standard, and start the special calculation of interlayer shear and transverse tensile strength. Numerical shear force calculation is performed on the contact surface of adjacent plies to simulate the stress state of the contact surface under service conditions, calculate the shear force value at each contact point, and generate interlayer shear force distribution data. Simultaneously perform transverse tensile property calculations on each ply, and combine the mechanical properties of the composite matrix and fibers to solve for the transverse tensile load limit value of each ply, generating transverse tensile limit data. By integrating interlayer shear force distribution data and transverse tensile limit data, summarizing all calculation results and performing numerical standardization, a complete set of basic mechanical calculation results is generated.

[0023] The working principle and effects of the above technical solution are as follows: By extracting various parameters from the micro-layer gradient configuration data and integrating them to generate a complete set of layer structure parameters, the comprehensiveness of mechanical calculations is ensured, calculation deviations caused by parameter omissions are reduced, and the reliability of calculation results is improved. By setting a unified mechanical solution standard and initiating special calculations for interlaminar shear and transverse tensile strength, the calculation process is made more standardized, avoiding the confusion caused by inconsistent calculation standards. By simulating service conditions to solve for interlaminar shear force values, the stress situation at each contact point is accurately captured, enhancing the realism of interlaminar stress analysis and reducing the potential for later interlaminar shear failure. By combining the properties of composite materials to solve for the transverse tensile limit, the load-bearing capacity of each layer is fully understood, avoiding structural damage due to insufficient tensile performance. By integrating and standardizing the calculation data, complete basic mechanical calculation results are generated, which not only provides accurate basis for subsequent comparison of layer schemes but also allows for early detection of structural hazards, further ensuring the service safety of the micro-layer structure.

[0024] In one embodiment of the present invention, step S4 includes: S41. Collect the component parameters of the polymer matrix material of the composite socket and the service condition parameters of the ambient temperature and humidity, construct a viscoelastic creep constitutive model adapted to the working conditions of the pipe fitting, and characterize the inherent law of the deformation of the matrix material over time. S42. Collect the aging characteristic parameters of the sealing ring material and the measured data of the long-term extrusion relaxation test, and fit the curve of the gradual decay of the sealing ring assembly interference force with the service time to completely restore the time evolution law of the interference force. S43. Couple the viscoelastic creep constitutive model with the interference force relaxation evolution curve of the sealing ring, and disassemble it into segments according to the service time nodes. Segment by segment, the radial expansion deformation amplitude of the inner wall of the socket caused by the combined action of load and material properties is deduced to generate time-varying creep deformation prediction data. S44. Decompose the creep expansion increments in the time-varying creep deformation prediction data for different service periods, and convert them into the thickness compensation increment values ​​used to offset deformation deviations for the corresponding periods. S45. The thickness compensation increments calculated for each time period are superimposed onto the corresponding points of the non-uniform thickness initial distribution data. The compensation amount is superimposed synchronously as the service duration increases, generating time-varying compensated thickness distribution data.

[0025] The working principle and effects of the above technical solution are as follows: By collecting the composition of the polymer matrix material and service condition parameters, a suitable viscoelastic creep constitutive model is constructed to accurately characterize the deformation law of the material over time, improving the accuracy of deformation prediction and reducing prediction deviations caused by model inconsistencies. By collecting aging parameters of the sealing ring and experimental data, the interference force decay curve is fitted to completely restore the time-series change of the interference force, avoiding design oversights caused by ignoring interference force decay. By coupling the model and curve, the radial expansion deformation of the socket is deduced segment by segment, generating time-varying creep prediction data, enhancing the pertinence of deformation prediction and reducing the hidden danger of deformation runaway during long-term service. By disassembling the deformation increment and converting the thickness compensation value, accurate compensation is achieved, avoiding loosening or damage to the socket structure caused by creep deformation. By superimposing the compensation amount to generate time-varying compensation thickness data, it can adapt to the deformation changes throughout the entire service cycle and maintain the stability of the socket structure, further extending the service life of the pipe fittings and reducing later maintenance costs.

[0026] In one embodiment of the present invention, S43 includes: Extract the constructed viscoelastic creep constitutive model and the fitted sealing ring interference force relaxation evolution curve, integrate the model parameters and curve feature data, and generate the basic dataset for coupling analysis; Import the basic dataset for coupling analysis into the time-series coupling operation module, set the time node division standard for the entire service life of the socket, and complete the time segmentation according to the service duration interval. For each time point after disassembly, the viscoelastic creep constitutive model is substituted to calculate the radial creep deformation value caused by the properties of the polymer matrix itself during that time period. Simultaneously substitute the interference force relaxation evolution curve of the sealing ring, obtain the interference force value at the corresponding time node, and calculate the radial expansion deformation value of the inner wall of the socket under the interference force. By superimposing the matrix creep deformation and interference force expansion deformation values ​​at each time point, and summarizing the deformation data for all time periods, complete time-varying creep deformation prediction data is generated.

[0027] The working principle and effects of the above technical solution are as follows: By extracting the viscoelastic creep constitutive model and the relaxation evolution curve of the sealing ring interference force, a coupled analysis basic dataset is generated, ensuring the integrity of subsequent time-series calculations, reducing inference deviations caused by missing data, and improving the basic reliability of deformation prediction. By setting a standard for dividing the time nodes of the entire service cycle and breaking down the time into segments according to time intervals, the inference process becomes more systematic, avoiding prediction errors caused by time-series confusion. By substituting each node into the model to calculate the creep deformation of the matrix, the deformation caused by the material's own characteristics is accurately captured, enhancing the pertinence of deformation analysis and reducing misjudgments of the material's deformation law. By simultaneously substituting the curves to calculate the expansion deformation caused by the interference force, the effects of dual loads are fully considered, avoiding the one-sided prediction caused by single-factor analysis. By superimposing the two types of deformation values ​​and summarizing them to generate time-varying creep prediction data, the deformation change trend of the entire service cycle can be fully presented, and an accurate basis can be provided for subsequent thickness compensation, further ensuring the long-term stability of the socket structure and avoiding structural hazards caused by inaccurate deformation prediction.

[0028] In one embodiment of the present invention, step S5 includes: S51. Extract the thickness distribution data after time-varying compensation as the optimization basis, sort out the long-term load safety limit of the pipe structure, the overall consumption control standard of raw materials and the boundary conditions of the forming process, and delineate the multi-dimensional constraint boundary range. S52. Incorporate the three types of constraints—structural safety, material usage, and manufacturing process—into the same optimization solution framework, introduce a multi-objective joint optimization algorithm to conduct iterative deduction of parameters across the entire domain, and generate in batches alternative thickness configuration schemes that satisfy the constraint boundaries. S53. Screen and classify the batch of candidate thickness configuration schemes for non-dominant solutions, eliminate inferior schemes with shortcomings in a single indicator, retain the high-quality scheme combinations in which each indicator is mutually balanced, and generate Pareto optimal thickness scheme set data. S54. For each scheme in the Pareto optimal thickness scheme set, a full life cycle performance evaluation index system is introduced to calculate the comprehensive service performance of each scheme in terms of long-term load, environmental aging, and deformation stability. S55. Compare the overall service performance of each optimal solution throughout its entire life cycle, select the configuration solution with the best overall performance and suitable for actual engineering application scenarios, solidify the structural thickness parameter values, and output the final thickness distribution result of the composite socket.

[0029] The working principle and effects of the above technical solution are as follows: By extracting time-varying compensated thickness data as the optimization basis, the relevant requirements for structural safety, material consumption, and manufacturing process are sorted out, and multi-dimensional constraint boundaries are delineated, improving the pertinence of the optimization direction, reducing the blindness in the optimization process, and avoiding solutions that do not meet actual needs. By incorporating the three types of constraints into the same optimization framework, a multi-objective joint optimization algorithm is introduced to carry out iterative deduction, generating alternative solutions in batches, enhancing the diversity of solutions, and reducing the limitations of a single solution. By screening non-dominated solutions, eliminating inferior solutions, and retaining high-quality combinations, a Pareto optimal solution set is generated, improving the overall quality of the solution and avoiding the impact of a single indicator's shortcomings on structural performance. By introducing a full life cycle evaluation system, the comprehensive service performance of each solution is calculated, and the long-term use effect is fully considered, avoiding the neglect of later aging, deformation, and other issues. By comparing and selecting the optimal suitable solution and fixing the parameters, the long-term safety and stability of the socket structure can be guaranteed, while controlling material consumption and adapting to the manufacturing process, taking into account safety, economy, and practicality, further improving the overall adaptability and service reliability of the pipe fittings.

[0030] In one embodiment of the present invention, S52 includes: Read the defined multi-dimensional constraint boundary range, extract the structural safety level limit parameters, material usage level control parameters, and manufacturing process level boundary parameters respectively, and generate a constraint condition sub-item dataset; By incorporating the constraint condition sub-datasets into a unified computing architecture, the dimensional fusion and correlation adaptation of the three types of constraints are completed, forming an integrated constraint control system; Load the multi-objective joint optimization algorithm computation link, use the socket thickness distribution parameter as the iterative deduction variable, and start the parameter traversal deduction process in the whole domain. In the iterative simulation process, the degree of matching between the calculation parameters and the integrated constraint control system is compared one by one, and the parameter combination forms that are within the constraint range throughout the process are retained. Collect all parameter combinations that meet the requirements of the constraint range, arrange them to form structural thickness combinations with different ratios, and generate alternative thickness configuration schemes that meet the constraint boundaries in batches.

[0031] The working principle and effects of the above technical solution are as follows: By reading the multi-dimensional constraint boundary range and extracting relevant parameters from each level to generate a sub-item dataset, the completeness and specificity of the constraints are ensured, reducing constraint deviations caused by parameter omissions and laying a solid foundation for subsequent optimization calculations. By incorporating the sub-item dataset into a unified computing architecture, dimensional fusion and correlation adaptation are completed, forming an integrated constraint control system. This avoids the computational chaos caused by the fragmentation of the three types of constraints and improves the standardization of constraint control. By loading a multi-objective joint optimization algorithm and initiating a full-domain traversal deduction with the thickness parameter as a variable, the parameter search range is expanded, reducing the possibility of missing the optimal solution and enhancing the comprehensiveness of the solution. By successively comparing the matching degree between the parameters and the constraint system, parameter combinations that meet the requirements are retained, avoiding redundant calculations of invalid parameter combinations and improving deduction efficiency. By aggregating parameter combinations that meet the conditions, candidate thickness schemes are generated in batches, providing sufficient high-quality alternatives for subsequent screening while taking into account the needs of structure, materials, and processes, further ensuring the rationality and practicality of subsequent optimization results.

[0032] One embodiment of the present invention provides a composite socket thickness design system for socket-type pipe fittings, the system comprising: One or more processors; Memory, used to store one or more programs; Wherein, when the one or more programs are executed by the one or more processors, the one or more processors are made to implement the method described in any one of the above.

[0033] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for designing the thickness of the composite socket of a socket-type pipe fitting, characterized in that, The method includes: S1. Perform multi-field coupling superposition analysis on the force borne by the composite socket of the socket-type pipe fitting to generate multi-field coupling load distribution data; perform full-section stress gradient scanning on the multi-field coupling load distribution data to generate non-uniform stress distribution spectrum data of the socket. S2. Perform macroscopic topological streamline optimization on the non-uniform stress distribution map data of the socket to generate macroscopic topological streamline distribution data; perform thickness inverse mapping on the macroscopic topological streamline distribution data to convert the streamline density gradient into the target thickness value of each region of the socket, forming non-uniform initial thickness distribution data that decreases from the high stress region to the low stress region. S3. Perform micro-composite gradient matching processing on the non-uniform thickness initial distribution data to generate micro-layup gradient configuration data; check the interlaminar shear stress and transverse tensile strength of the micro-layup gradient configuration data to generate composite gradient matching verification data. S4. Perform time-varying creep compensation processing on the composite gradient matching verification data to generate time-varying creep deformation prediction data; perform thickness dynamic compensation superposition on the time-varying creep deformation prediction data, superimpose the creep decay compensation amount that increases with time on the non-uniform initial thickness distribution to generate time-varying compensated thickness distribution data. S5. Perform multi-objective constraint convergence processing on the time-varying compensation thickness distribution data, perform joint optimization solution, and generate Pareto optimal thickness scheme set data; perform full life cycle structural performance evaluation on the Pareto optimal thickness scheme set data, and output the final thickness distribution result of the composite socket.

2. The composite socket thickness design method for socket-type pipe fittings according to claim 1, characterized in that, S1 includes: S11. Collect parameters of medium internal pressure, sealing ring assembly extrusion deformation, pipeline docking axial extrusion, and foundation uneven settlement deformation under the service conditions of composite socket pipe fittings, integrate the original parameter set of multiple types of mechanical action, and complete the collection of multi-dimensional original stress information. S12. Import the collected multi-dimensional stress original parameter set into the multi-field coupled numerical solution module to complete the field coupling superposition calculation of internal pressure load, radial interference force of sealing ring, axial thrust of socket and foundation settlement bending stress, solve the numerical distribution state of the overall stress field of socket, and generate multi-field coupled load distribution data. S13. Based on the full-domain stress scanning algorithm, perform layer-by-layer progressive stress gradient traversal detection on the full cross section of the socket using multi-field coupled load distribution data, capture the fluctuation and change patterns of stress values ​​at each point of the cross section layer by layer, and lock the key location areas where stress values ​​change abruptly. S14. Divide the key location areas captured during the traversal detection process into regional attributes, and divide the area of ​​peak stress value at the bottom of the sealing ring groove and the area of ​​low redundant stress value at the edge of the socket end. Simultaneously record the point information of the two types of areas in the three-dimensional space of the socket. S15. Integrate the regional attribute division results with three-dimensional spatial point information to complete the graphical reconstruction of the stress distribution state of the entire cross section, fully present the distribution differences of stress intensity in different regions, and generate non-uniform distribution map data of socket stress.

3. The composite socket thickness design method for a socket-type pipe fitting according to claim 2, characterized in that, S14 includes: Extract data from key locations where stress values ​​change abruptly, analyze the stress value ranges, cross-sectional distribution ranges, and force transmission directions of each key region, and generate basic feature data for the key regions. Import the basic feature data of key areas into the regional attribute identification module, and combine the functional zoning requirements of the socket structure to determine the stress intensity level of each key area, and distinguish between high stress concentration areas and low stress redundancy areas. For the two types of areas identified, positioning detection is carried out to accurately capture the boundary contour of the high stress peak area at the bottom of the sealing ring groove, and at the same time identify the extension range of the low stress redundancy area at the edge of the socket end. The three-dimensional spatial coordinate acquisition module is activated to acquire coordinates of each boundary point and core point in the high stress concentration area and the low stress redundancy area, and to record the three-dimensional spatial coordinate parameters of each point. By integrating the attribute determination results of the two types of regions with the three-dimensional spatial coordinate parameters, a correspondence between regional attributes and spatial location is established, generating point record data containing regional type, distribution range and coordinate information.

4. The composite socket thickness design method for a socket-type pipe fitting according to claim 1, characterized in that, S2 includes: S21. Use the non-uniform distribution map data of the socket stress as the basic analysis carrier, extract the stress vector direction and stress numerical gradient change characteristics of each point in the map, and sort out the overall trend of natural stress transmission in the socket section. S22. Run the principal stress tracing algorithm to perform continuous streamline extension fitting along the natural stress transmission trend, and generate multiple continuously arranged material distribution streamlines that are in line with the stress flow direction within the annular cross section of the socket, generating macroscopic topological streamline distribution data. S23. Analyze the differences in the density and arrangement of streamlines within the macroscopic topological streamline distribution data, quantify the hierarchical differences in streamline aggregation density in different regions, and establish the correlation between streamline density and structural load-bearing requirements. S24. Based on the difference in streamline density levels, perform reverse conversion and assignment of thickness parameters for each region of the socket. High stress corresponds to high-density streamline regions and is matched with large thickness parameters, while low stress corresponds to low-density streamline regions and is matched with small thickness parameters. S25. The thickness parameters after the assignment of values ​​to each region are smoothly connected to form a non-uniform initial thickness distribution data that decreases from the high stress area to the low stress area.

5. The composite socket thickness design method for a socket-type pipe fitting according to claim 1, characterized in that, The S3 includes: S31. Read the initial distribution data of non-uniform thickness to define the range of each structural partition of the socket, locate the special structural section where the stress flow direction at the root of the socket is significantly bent and deflected, and delineate the key control area of ​​micro-layup. S32. Adjust the inclination angle of composite material layup arrangement layer by layer for key control areas, and simultaneously gradually control the fiber volume ratio inside a single layer. Complete the gradient arrangement of layup parameters along the stress deflection direction to generate micro layup gradient configuration data. S33. Substitute the micro-ply gradient configuration data to perform mechanical calculations of interlayer interactions, solve for the shear force values ​​between the contact surfaces of adjacent ply layers and the tensile limit values ​​of the material's transverse bearing capacity, and obtain the basic mechanical calculation results. S34. Compare the mechanical calculation results of the gradient ply structure with the mechanical performance of the traditional uniform thickness ring ply structure, and compare the interlayer separation development trend of the two types of structures under long-term load. S35. Select configuration schemes in gradient layup structures that meet the long-term service limit requirements for interlaminar shear and transverse tensile strength, avoid the risk of interlaminar delamination damage that is easily caused by uniform thickness annular layup, and generate composite gradient matching verification data.

6. The method for designing the composite socket thickness of a socket-type pipe fitting according to claim 5, characterized in that, S32 includes: Extract data from the designated micro-layer key control area, obtain the stress deflection angle, stress distribution gradient and structural size parameters of the area, and generate characteristic data of the key control area; Import the characteristic data of the key control area into the ply tilt angle control module, and set the ply tilt angle adjustment increment layer by layer according to the stress deflection direction at the socket root to complete the gradient adjustment of the ply angle of each layer. Simultaneously collect fiber material parameters and matrix ratio parameters of a single layer of composite material, and gradually adjust the fiber volume ratio inside the single layer according to the stress bearing requirements of each layer to achieve fiber distribution and stress matching. By integrating the adjusted ply tilt angle and fiber volume ratio parameters of each layer, the ply parameters of each layer are continuously connected according to the stress deflection direction to avoid structural weak points caused by abrupt parameter changes. The gradient parameter configuration information of all layers is summarized to generate micro-layer gradient configuration data including the tilt angle, fiber ratio and arrangement order of each layer.

7. The method for designing the composite socket thickness of a socket-type pipe fitting according to claim 1, characterized in that, The S4 includes: S41. Collect the component parameters of the polymer matrix material of the composite socket and the service condition parameters of the ambient temperature and humidity, construct a viscoelastic creep constitutive model adapted to the working conditions of the pipe fitting, and characterize the inherent law of the deformation of the matrix material over time. S42. Collect the aging characteristic parameters of the sealing ring material and the measured data of the long-term extrusion relaxation test, and fit the curve of the gradual decay of the sealing ring assembly interference force with the service time to completely restore the time evolution law of the interference force. S43. Couple the viscoelastic creep constitutive model with the interference force relaxation evolution curve of the sealing ring, and disassemble it into segments according to the service time nodes. Segment by segment, the radial expansion deformation amplitude of the inner wall of the socket caused by the combined action of load and material properties is deduced to generate time-varying creep deformation prediction data. S44. Decompose the creep expansion increments in the time-varying creep deformation prediction data for different service periods, and convert them into the thickness compensation increment values ​​used to offset deformation deviations for the corresponding periods. S45. The thickness compensation increments calculated for each time period are superimposed onto the corresponding points of the non-uniform thickness initial distribution data. The compensation amount is superimposed synchronously as the service duration increases, generating time-varying compensated thickness distribution data.

8. The method for designing the composite socket thickness of a socket-type pipe fitting according to claim 7, characterized in that, S43 includes: Extract the constructed viscoelastic creep constitutive model and the fitted sealing ring interference force relaxation evolution curve, integrate the model parameters and curve feature data, and generate the basic dataset for coupling analysis; Import the basic dataset for coupling analysis into the time-series coupling operation module, set the time node division standard for the entire service life of the socket, and complete the time segmentation according to the service duration interval. For each time point after disassembly, the viscoelastic creep constitutive model is substituted to calculate the radial creep deformation value caused by the properties of the polymer matrix itself during that time period. Simultaneously substitute the interference force relaxation evolution curve of the sealing ring, obtain the interference force value at the corresponding time node, and calculate the radial expansion deformation value of the inner wall of the socket under the interference force. By superimposing the matrix creep deformation and interference force expansion deformation values ​​at each time point, and summarizing the deformation data for all time periods, complete time-varying creep deformation prediction data is generated.

9. The method for designing the composite socket thickness of a socket-type pipe fitting according to claim 1, characterized in that, The S5 includes: S51. Extract the time-varying compensation thickness distribution data as the optimization basis, sort out the long-term load safety limit of the pipe structure, the overall consumption control standard of raw materials and the boundary conditions of the forming process, and delineate the multi-dimensional constraint boundary range. S52. Incorporate the three types of constraints—structural safety, material usage, and manufacturing process—into the same optimization solution framework, introduce a multi-objective joint optimization algorithm to conduct iterative deduction of parameters across the entire domain, and generate in batches alternative thickness configuration schemes that satisfy the constraint boundaries. S53. Screen and classify the batch of candidate thickness configuration schemes for non-dominant solutions, eliminate inferior schemes with shortcomings in a single indicator, retain the high-quality scheme combinations in which each indicator is mutually balanced, and generate Pareto optimal thickness scheme set data. S54. For each scheme in the Pareto optimal thickness scheme set, a full life cycle performance evaluation index system is introduced to calculate the comprehensive service performance of each scheme in terms of long-term load, environmental aging, and deformation stability. S55. Compare the overall service performance of each optimal solution throughout its entire life cycle, select the configuration solution with the best overall performance and suitable for actual engineering application scenarios, solidify the structural thickness parameter values, and output the final thickness distribution result of the composite socket.

10. A composite socket thickness design system for socket-type pipe fittings, characterized in that, The system includes: One or more processors; Memory, used to store one or more programs; Wherein, when the one or more programs are executed by the one or more processors, the one or more processors implement the method of any one of claims 1 to 9.

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