CN113051790B - Steam load loading method, system, equipment and medium for finite element simulation - Google Patents
Steam load loading method, system, equipment and medium for finite element simulation Download PDFInfo
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Abstract
The invention discloses a steam load loading method, a system, equipment and a medium for finite element simulation, which comprise the steps of determining temperature distribution information of a central point of each unit in a concrete model, and calculating steam pressure distribution information of each unit in the concrete model; converting the steam pressure distribution information into three-dimensional main stress of a corresponding unit, writing a blank result file to obtain a steam pressure stress field result file, and introducing the steam pressure stress field result file into a concrete model to obtain a static balance analysis result; extracting node force results of each unit in the concrete model; establishing a node set of the concrete model, and correspondingly applying a node force result to each node of the concrete model as a load; according to the invention, the temperature field of the concrete model is converted into the equivalent node force field through the steam pressure field, so that the application of the equivalent load of the steam pressure field is realized, the accuracy is high, and the actual value of the steam pressure can be reduced to a great extent; the application process is independent, a geometric model does not need to be modified, and the simulation effect is good.
Description
Technical Field
The invention belongs to the technical field of simulation, and particularly relates to a steam load loading method, a system, equipment and a medium for finite element simulation.
Background
The finite element numerical simulation method is a main method for predicting stress and strain of various structures in the field of civil engineering, and provides an important means for technical reference for structural design and construction processes; in the finite element numerical modeling process, accurate value and application of load are a key ring for accurate simulation or not; various types of loads exist in finite element numerical modeling, such as physical forces including gravity, inertial force, seepage force, magnetic field load and the like, and surface forces including wind load, uniform load and the like; the load form is simple, the application mode is clear, and most finite element software directly provides the application mode.
However, some indirect loads cannot be applied directly in finite element procedures, such as the vapor pressure caused by the vaporization of moisture in a concrete thermal storage element; the concrete heat storage element is widely used in various heat storage systems due to the advantages of low cost, easy molding, good mechanical property, thermal expansion coefficient equivalent to steel and the like, the element uses heat conduction oil, molten salt and the like as heat transfer media, and the concrete is used as the heat storage media. The concrete pouring process has a large amount of moisture, the evaporation can be completed only after a long time, the moisture in the concrete heat storage element is quickly gasified under the action of high temperature when the concrete heat storage element is used, and the generated steam pressure can possibly cause concrete explosion accidents, so that numerical simulation prediction on the internal force distribution of the concrete caused by the steam pressure generated in the heating process is necessary; however, because the steam pressure load is difficult to directly apply, the simulation is carried out on the steam pressure load, and the container pressure is only applied on the inner wall of the internal pipeline, so that the influence of the steam pressure on the concrete cannot be accurately simulated.
In the prior art, pressure is often applied in the pores by adding the pores to the original model; the method has the defects that the geometric structure of the original model needs to be changed, meanwhile, as the added pores are usually smaller, the difficulty and quality of the grid division of the model and the total number of grids are increased, so that the calculation cost is greatly increased, and the method cannot be suitable for a larger model; and the effect is not good, and the actual effect of accurately reducing the steam pressure is difficult.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a steam load loading method, a steam load loading system and a steam load loading device for finite element simulation, which are used for solving the technical problems that the geometric structure of an original model needs to be changed in the existing concrete steam pressure load simulation process, the calculation difficulty is low and the simulation result is poor.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a steam load loading method for finite element simulation, which comprises the following steps:
acquiring temperature distribution of a concrete model, and determining temperature distribution information of each unit center point in the concrete model;
calculating steam pressure distribution information of each unit in the concrete model;
constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file;
leading the steam pressure stress field result file into a concrete model, and running static balance analysis to obtain a static balance analysis result;
according to the static analysis result, extracting the node force result of each unit in the concrete model;
establishing a node set of the concrete model, and correspondingly applying a node force result to each node of the concrete model as a load; the steam load loading is completed.
Further, when the temperature distribution of the concrete model is obtained, transient heat transfer analysis of the concrete model is adopted to obtain the temperature distribution of the concrete model.
Further, the process of calculating the steam pressure distribution information of each unit in the concrete model comprises the following steps:
and calculating the steam pressure distribution information of each unit in the concrete model by using a temperature-steam pressure empirical formula according to the temperature distribution information of the central point of each unit in the concrete model.
Further, the empirical formula of temperature-vapor pressure is:
p＝7.9×10 -7 t 3 -1.94×10 -4 t 2 +0.0168t-0.3953
wherein p is steam pressure distribution information of each unit in the concrete model, and t is temperature distribution information of a central point of each unit in the concrete model.
Further, the principal stress values in three directions of each unit in the concrete model are respectively equal to the steam pressure values of the corresponding units.
Further, the process of obtaining the static balance analysis result is as follows:
leading the steam pressure stress field result file into a concrete model; and constraining all displacement degrees of freedom of each node in the concrete model, and then running static balance analysis to obtain a static balance analysis result.
Further, the node force result process of each unit in the concrete model is extracted:
traversing the node force result data of each node in the concrete model through finite element secondary development, and extracting node force values of each node in three directions in the concrete model to obtain the node force result of each unit in the concrete model.
The invention also provides a steam load loading system for finite element simulation, which comprises a steam pressure stress field acquisition module, a node force field acquisition module and a node force field application module;
the steam pressure stress field acquisition module is used for acquiring the temperature distribution of the concrete model and determining the temperature distribution information of the central point of each unit in the concrete model; calculating steam pressure distribution information of each unit in the concrete model; constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file;
the node force field acquisition module is used for guiding the steam pressure stress field result file into the concrete model, and running static balance analysis to obtain a static balance analysis result; according to the static analysis result, extracting the node force result of each unit in the concrete model;
the node force field applying module is used for establishing a node set of the concrete model and applying a node force result as a load to each node of the concrete model correspondingly; the steam load loading is completed.
The invention also provides a steam load loading device for finite element simulation, which comprises a memory, a processor and executable instructions stored in the memory and capable of running in the processor; the processor, when executing the executable instructions, implements the vapor load loading method for finite element modeling.
The invention also provides a computer readable storage medium having stored thereon computer executable instructions which when executed by a processor implement the steam load loading method for finite element simulation.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a steam load loading method, a system, equipment and a medium for finite element simulation, which are used for realizing the application of equivalent load of a steam pressure field by converting the steam pressure field into an equivalent node force field through the temperature field of a concrete model, and have clear logic; the steam pressure stress field is applied in an equivalent node force field mode, so that the accuracy is high, and the actual value of the steam pressure stress field can be restored to a great extent; the application process is independent, the geometric model is not required to be modified, the application of other loads is not influenced, and the simulation effect is good.
Furthermore, the method can realize automatic modeling through secondary development of finite elements, and has high efficiency.
Drawings
FIG. 1 is a flow chart of a vapor load loading method for finite element modeling according to an embodiment;
FIG. 2 is a graph showing temperature distribution information of a concrete model according to an embodiment;
FIG. 3 is a graph of saturated steam versus temperature for the example;
FIG. 4 is a graph of the steam pressure stress field results obtained after application of the node force field in the examples;
fig. 5 is a graph of the results of static analysis after applying the node force results to the concrete model in the examples.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the following specific embodiments are used for further describing the invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples
As shown in fig. 1, a steam load process is applied to a concrete model, and the steam load process is based on ABAQUS software; the embodiment provides a steam load loading method for finite element simulation, which comprises the following steps:
step 1, transient heat transfer analysis is adopted on a concrete model, temperature distribution of the concrete model is obtained, and temperature distribution information of each unit center point in the concrete model is determined; as shown in fig. 2, temperature distribution information of a center point of each unit in the concrete model, that is, a temperature field of the concrete model is shown in fig. 2.
Step 2, calculating to obtain steam pressure distribution information of each unit in the concrete model by using a temperature-steam pressure empirical formula according to temperature distribution information of a central point of each unit in the concrete model; wherein the relationship between saturated vapor pressure and temperature is shown in FIG. 3.
In this example, the temperature-vapor pressure empirical formula is:
p＝7.9×10 -7 t 3 -1.94×10 -4 t 2 +0.0168t-0.3953
wherein p is steam pressure distribution information of each unit in the concrete model, and t is temperature distribution information of a central point of each unit in the concrete model.
And 3, constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file.
In this embodiment, the steam pressure is hydrostatic pressure, and corresponds to each unit of the concrete model, namely, the ball stress; therefore, the main stress values of each unit in the concrete model in three directions are respectively equal to the steam pressure values of the corresponding units; the steam pressure value of each unit in the concrete model is correspondingly endowed with the main stress in three directions of each unit, and the main stress is written into a blank result file to obtain a steam pressure stress field result file of each unit of the concrete model; because the result file obtained by the ABAQUS software is a read-only file, the result file cannot be directly written in; in the embodiment, by constructing a blank result file, a steam pressure stress field result file is obtained by writing three-way main stress of each unit of the concrete model in the blank result file; when a blank result file is constructed, the secondary development of finite elements is adopted; the blank result file contains a concrete model and unit division results.
Step 4, importing a steam pressure stress field result file into a concrete model; constraining all displacement degrees of freedom of each node in the concrete model, and then running static balance analysis to obtain a static balance analysis result; in the embodiment, the obtained static balance analysis result is a node force field of the concrete model; the node force field of the concrete model obtained through the steam pressure stress field subjected to the balance operation is equivalent to the steam pressure stress field obtained when the node force field is applied to the concrete model.
Step 5, extracting a node force result of each unit in the concrete model according to the static analysis result; in the embodiment, through secondary finite element development, traversing the node force result data of each node in the concrete model, extracting node force values of each node in three directions in the concrete model, and obtaining node force results of each unit in the concrete model; as shown in fig. 4, a graph of the steam pressure stress field obtained after the node result is applied is shown in fig. 4, and it can be seen from fig. 4 that the steam pressure field obtained by the method described in this embodiment is consistent with the actual situation, and the simulation effect is good.
Step 6, establishing a node set of the concrete model, and correspondingly applying a node force result to each node of the concrete model as a load; so far, the loading of the steam load is completed; in this embodiment, since in ABAQUS software, the objects of application of force are sets; the node force results of all units in the concrete model obtained in the step 5 are different, and each node is independently built into a set for applying node force; and establishing a corresponding set for each node through a circulation statement according to the total node number of the concrete model, and respectively and correspondingly applying a node force result to each node of the concrete to obtain a steam load loading result.
As shown in fig. 5, a graph of static analysis results after the node force results are applied to the concrete model is shown in fig. 5, and as can be seen from fig. 5, after the node force results are applied to the concrete model, the concrete model cracks, so that simulation of a cracking process caused by rapid evaporation of internal water due to heating of the concrete heat storage element is realized.
The embodiment also provides a steam load loading system for finite element simulation, which comprises a steam pressure stress field acquisition module, a node force field acquisition module and a node force field application module;
the steam pressure stress field acquisition module is used for acquiring the temperature distribution of the concrete model and determining the temperature distribution information of the central point of each unit in the concrete model; calculating steam pressure distribution information of each unit in the concrete model; constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file;
the node force field acquisition module is used for guiding the steam pressure stress field result file into the concrete model, and running static balance analysis to obtain a static balance analysis result; according to the static analysis result, extracting the node force result of each unit in the concrete model;
the node force field applying module is used for establishing a node set of the concrete model and applying a node force result as a load to each node of the concrete model correspondingly; the steam load loading is completed.
The present embodiment also provides a vapor load loading device for finite element simulation, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor; the steps in the embodiment of the steam load loading method for finite element simulation are realized when the processor executes the computer program; alternatively, the processor may implement the functions of the modules in the loading system embodiment described above when executing the computer program.
The computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to accomplish the present invention, for example. The one or more modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the steam load loading device for finite element simulation. For example, the computer program may be partitioned to include, for example, a vapor pressure stress field acquisition module, a node force field acquisition module, and a node force field application module; the steam pressure stress field acquisition module is used for acquiring the temperature distribution of the concrete model and determining the temperature distribution information of the central point of each unit in the concrete model; calculating steam pressure distribution information of each unit in the concrete model; constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file; the node force field acquisition module is used for guiding the steam pressure stress field result file into the concrete model, and running static balance analysis to obtain a static balance analysis result; according to the static analysis result, extracting the node force result of each unit in the concrete model; the node force field applying module is used for establishing a node set of the concrete model and applying a node force result as a load to each node of the concrete model correspondingly; the steam load loading is completed.
The steam load loading device for finite element simulation can be a computing device such as a desktop computer, a notebook computer, a palm computer and a cloud server. The vapor load loading device for finite element simulation may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that more or fewer components than processors and memories may be included, or certain components may be combined, or different components may be included, such as the vapor load loading device for finite element modeling may also include input and output devices, network access devices, buses, and the like.
The processor may be a central processing unit (CentralProcessingUnit, CPU), other general purpose processors, digital signal processors (DigitalSignalProcessor, DSP), application specific integrated circuits (ApplicationSpecificIntegratedCircuit, ASIC), off-the-shelf programmable gate arrays (Field-ProgrammableGateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is the control center of the vapor load loading device for finite element simulation, and various interfaces and lines are used to connect the various parts of the entire vapor load loading device for finite element simulation.
The memory may be used to store the computer program and/or module, and the processor may implement the various functions of the vapor load loading device for finite element modeling by running or executing the computer program and/or module stored in the memory and invoking data stored in the memory.
The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart memory card (SmartMediaCard, SMC), secure digital (SecureDigital, SD) card, flash card (FlashCard), at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The present embodiment also provides a computer readable storage medium in which the module for the vapor load loading device integration of the finite element simulation, if implemented in the form of a software functional unit and sold or used as a stand-alone product, can be stored.
Based on such understanding, the present invention may also be implemented by implementing all or part of the above embodiment method, or by implementing relevant hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and when executed by a processor, the computer program may implement the following steps:
acquiring temperature distribution of a concrete model, and determining temperature distribution information of each unit center point in the concrete model; calculating steam pressure distribution information of each unit in the concrete model; constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file; leading the steam pressure stress field result file into a concrete model, and running static balance analysis to obtain a static balance analysis result; according to the static analysis result, extracting the node force result of each unit in the concrete model; establishing a node set of the concrete model, and correspondingly applying a node force result to each node of the concrete model as a load; the steam load loading is completed.
Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc.
The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), an electrical carrier signal, a telecommunication signal, a software distribution medium, and so forth.
According to the steam load loading method, system, equipment and medium for finite element simulation, as the steam pressure and the temperature have a definite functional relationship, the steam load loading method, system, equipment and medium for finite element simulation adopts a temperature-steam pressure empirical formula, and the distribution information of the steam pressure is determined through the temperature distribution of a concrete model; constructing a blank result file through finite element secondary development, converting the acquired steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, applying the three-dimensional main stress to the corresponding unit in the concrete model, and writing the blank result file to obtain a steam pressure stress field result file; the steam pressure stress field result file is led into a concrete model, all displacement degrees of freedom of each node of the concrete model are restrained, and static balance analysis is operated; according to the static balance analysis result, extracting a node force result and recording a node number; and establishing a set for each node, wherein the set name corresponding to each node is the same as the name of the node force result, and applying the node force result to each node as a load by modifying the inp file until the load is applied.
The steam load loading method for finite element simulation not only can be used for simulating a steam pressure stress field in a concrete heat storage element, but also can simulate a stress field or a pressure field which needs to be applied; the most basic load mode in finite element numerical simulation is node load, and all other forms of load are finally applied and modeled in the form of node force.
In the invention, the steam pressure is formally expressed as the principal stress in three directions, and the principal stress in two directions is the stress field with the same value for the two-dimensional model, and the stress value is the value of the steam pressure at the node. For the situation that the stress field exists due to the plastic property of the material and the self-existence, the steam pressure stress field cannot be directly led into the model to realize the load application, and the mode of equivalent node force can be adopted only; in the invention, an equivalent test of the steam pressure field load in finite element numerical modeling is taken as a target, the conversion from a temperature field to a steam pressure field to an equivalent node force field is realized through secondary development of finite elements, the application of the steam pressure field equivalent load is realized, the logic of the method is clear, the automatic modeling can be realized through secondary development programming of the finite elements, the steam pressure field is applied in an equivalent node force mode, the precision is high, and the actual numerical value of the steam pressure field can be greatly reduced; the method can realize automatic modeling through the secondary development of finite elements, and has high efficiency; the application process is independent, the geometric model does not need to be modified, and the application of other loads is not influenced.
The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present invention, and the scope of the claimed invention is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present invention.
Claims (8)
1. A vapor load loading method for finite element modeling, comprising the steps of:
acquiring temperature distribution of a concrete model, and determining temperature distribution information of each unit center point in the concrete model;
calculating steam pressure distribution information of each unit in the concrete model;
constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file;
leading the steam pressure stress field result file into a concrete model, and running static balance analysis to obtain a static balance analysis result;
according to the static analysis result, extracting the node force result of each unit in the concrete model;
establishing a node set of the concrete model, and correspondingly applying a node force result to each node of the concrete model as a load; so far, the loading of the steam load is completed;
the main stress values of each unit in the concrete model in three directions are respectively equal to the steam pressure values of the corresponding units;
and (3) extracting a node force result process of each unit in the concrete model:
traversing the node force result data of each node in the concrete model through finite element secondary development, and extracting node force values of each node in three directions in the concrete model to obtain the node force result of each unit in the concrete model.
2. The method for loading steam load for finite element simulation according to claim 1, wherein the temperature distribution of the concrete model is obtained by transient heat transfer analysis of the concrete model when the temperature distribution of the concrete model is obtained.
3. A steam load loading method for finite element simulation according to claim 1, wherein the steam pressure distribution information process of each unit in the concrete model is calculated:
and calculating the steam pressure distribution information of each unit in the concrete model by using a temperature-steam pressure empirical formula according to the temperature distribution information of the central point of each unit in the concrete model.
4. A method for loading a vapor load for finite element modeling according to claim 3, wherein the empirical formula of temperature-vapor pressure is:
p＝7.9×10 -7 t 3 -1.94×10 -4 t 2 +0.0168t-0.3953
wherein p is steam pressure distribution information of each unit in the concrete model, and t is temperature distribution information of a central point of each unit in the concrete model.
5. A method for loading a finite element simulation steam load according to claim 1, wherein the process of obtaining the static balance analysis results is as follows:
leading the steam pressure stress field result file into a concrete model; and constraining all displacement degrees of freedom of each node in the concrete model, and then running static balance analysis to obtain a static balance analysis result.
6. The steam load loading system for finite element simulation is characterized by comprising a steam pressure stress field acquisition module, a node force field acquisition module and a node force field application module;
the steam pressure stress field acquisition module is used for acquiring the temperature distribution of the concrete model and determining the temperature distribution information of the central point of each unit in the concrete model; calculating steam pressure distribution information of each unit in the concrete model; constructing a blank result file, converting the steam pressure distribution information of each unit in the concrete model into three-dimensional main stress of the corresponding unit, and writing the blank result file to obtain a steam pressure stress field result file;
the node force field acquisition module is used for guiding the steam pressure stress field result file into the concrete model, and running static balance analysis to obtain a static balance analysis result; according to the static analysis result, extracting the node force result of each unit in the concrete model;
the node force field applying module is used for establishing a node set of the concrete model and applying a node force result as a load to each node of the concrete model correspondingly; so far, the loading of the steam load is completed;
the main stress values of each unit in the concrete model in three directions are respectively equal to the steam pressure values of the corresponding units;
and (3) extracting a node force result process of each unit in the concrete model:
traversing the node force result data of each node in the concrete model through finite element secondary development, and extracting node force values of each node in three directions in the concrete model to obtain the node force result of each unit in the concrete model.
7. A vapor load loading apparatus for finite element modeling comprising a memory, a processor, and executable instructions stored in the memory and executable in the processor; the processor, when executing the executable instructions, implements the method of any of claims 1-5.
8. A computer readable storage medium having stored thereon computer executable instructions which when executed by a processor implement the method of any of claims 1-5.
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