CN101571887A - Finite element prediction system for welding and solidifying crack in virtual environment - Google Patents
Finite element prediction system for welding and solidifying crack in virtual environment Download PDFInfo
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Abstract
The invention provides a finite element prediction system for welding and solidifying a crack in virtual environment, which relates to the technical field of finite element prediction software for welding and solidifying a crack, and the complex simulation and the prediction processes of welding and solidifying a crack are simplified into the simple operation and settings of an interface. A preliminary processing subsystem comprises an interface operating module, an MSC.Marc interface document module, a subprogram.f file module and an invocation MSC.Marc software executing and computing module, and a post processing subsystem comprises a MSC.Marc software computed result processing module, a MatrixVB function module, a Matlab software module and a graphic display module; a solidified crack predicting subsystem comprises a resistivity curve loading module, a judgment module and a result output module. The application of the invention enables a common welding engineering technician to carry out the numerical simulation and prediction for welding and solidifying a crack; the computed result is processed, and the storage space of a result file is decreased; the result file is converted into a file format convenient for graphic display, and the computed results of a temperature field and a stress strain field are visually displayed in a graphic form.
Description
Technical field
The present invention relates to a kind of finite element prediction software technology field of welding and solidifying crack, be specifically related to the finite element prediction system of under the virtual environment that computing machine is constructed, welding and solidifying crack being predicted.
Background technology
Welding and solidifying crack is one of defective of harmfulness maximum in the metal material thermoforming process.The existence of solidification cracking not only influences product quality in the weld assembly, reduces serviceable life, and may cause catastrophic failure.Therefore, for a long time, both at home and abroad the researchist is exploring the formation mechanism, metallurgy/mechanical behavior of welding and solidifying crack and to the quantitative description of the process that ftractures always.
In recent years, numerical simulation more and more is subjected to the attention of height, is widely applied in the theoretical research and practical application of welding field.Research worker or carry out numerical simulation by programming voluntarily is perhaps by various numerical simulation softwares, as MSC.Marc, Abaqus, Adina﹠amp; T and Ansys etc. calculate and analyze, and have solved a lot of practical problemss, obtain a large amount of achievements.More and more enterprises begins to pay close attention to numerical simulation work, and wishes to utilize numerical simulation technology to solve the actual production problem.Yet also there is following subject matter in the numerical simulation of carrying out welding and solidifying crack:
1, the numerical simulation of carrying out welding and solidifying crack need to weld, material, heat transfer, finite element, computer programming or relevant many-sided knowledge and abilities such as graphics process.
Welding and solidifying crack is the result who resists between material resistance and the Mechanical Driven power.The material resistance is one of inherent characteristic of material, generally measures by experiment; And Mechanical Driven power is difficult to measure with test method, mainly calculates acquisition with the method for numerical simulation at present.The numerical simulation of solidification cracking driving force relates to welded structure, Welding Metallurgy, and the material thermal conduction study, finite element analysis, the knowwhy of aspects such as subroutine exploitation and graph and image processing is difficult to realize for general welding engineering personnel.
2, present finite element analysis software, general all is the common software of introducing from western developed countries such as America and Europes, be not to design at the welding specific area, when handling the welding and solidifying crack problem, still to carry out various user's subroutine establishments, add whole English interface, English handbook, for general welding job, it is bigger to use difficulty.
3, in the numerical simulation and prediction work process of welding and solidifying crack, relate to the many challenges of solution, institute is so that the widespread use in each enterprise of finite element numerical simulation technology is restricted.
Summary of the invention
The finite element prediction system that the purpose of this invention is to provide a kind of welding and solidifying crack in virtual environment, simulation of the welding and solidifying crack of complexity and forecasting process are reduced to simple operations and setting, make common welding engineering technician also can carry out the numerical simulation and the prediction work of welding and solidifying crack by the interface.
The present invention solves the problems of the technologies described above the technical scheme of taking to be:
Prognoses system of the present invention is made of pre-treatment subsystem, aftertreatment subsystem and solidification cracking predicting subsystem;
Pre-treatment subsystem 1 is by interface operation module, MSC.Marc interface document module, subroutine .f file module and call MSC.Marc software and carry out computing module and constitute;
The aftertreatment subsystem is made of MSC.Marc computed in software result treatment module, MatrixVB function module, Matlab software module, image display module;
The solidification cracking predicting subsystem by resistance curve call in module, judge module, output module constitutes as a result;
The interface operation module is used to read each parameter that is used to predict welding and solidifying crack of user's input or selection, and the interface operation module also is used to read the weld seam solidification cracking future position of user's input; MSC.Marc interface document module is used for described each parameter that the interface operation module reads is changed into the discernible interface document form of MSC.Marc software, subroutine .f file module is used for importing welding parameter according to the user and generates welding heat source, heat exchange and unit be subroutine anyway, MSC.Marc interface document module and subroutine .f file module generative process file are carried out and are called MSC.Marc software, call MSC.Marc software and carry out computing module and be used to be implemented under the virtual environment and carry out the FEM (finite element) calculation of welding and solidifying crack and result of calculation is passed to MSC.Marc computed in software result treatment module according to each parameter that the user imported; MSC.Marc computed in software result treatment module is used to link MatrixVB function module and Matlab software module, and obtain the graphical feedback information that generates by MatrixVB function module and Matlab software module, go out the figure as a result that each parametrical face according to user's input obtains by image display module display then; Resistance curve is called in module and is used to call in known resistance curve figure, and judge module is used to judge whether the prediction activation force profile and the resistance curve figure that are gone out by image display module display have intersection point; If output module shows " generation solidification cracking " as a result, otherwise output module shows " not producing solidification cracking " as a result.
The invention has the beneficial effects as follows:
Application of the present invention makes that the numerical simulation of welding and solidifying crack and prediction work become simply, easy operating, has realized that common welding engineering technician can carry out the numerical simulation and the prediction work of welding and solidifying crack; The present invention will move towards enterprise from the laboratory for the numerical simulation study of solidification cracking and lay a good foundation.The present invention is based on MSC.Marc, three-dimensional welding and solidifying crack simulation of an area of computer aided and prognoses system have been set up, utilize program development software and graphics software to carry out the design and the exploitation of the pre-process and post-process of system, adopt finite element analysis software MSC.Marc to carry out the backstage computing.
The not readable property of analog result makes the aftertreatment of MSC.Marc become difficult unusually, it is just passable to check that analog result also must enter into MSC.Mentat, and the aftertreatment result that will check behind general analog operation person's analog temperature field or the stress-strain field has: three-dimensional result figure, the contour cloud atlas of result, temperature and strain curve and cyclic curve.But obtain above-mentioned various aftertreatments as a result figure need realize that and three-dimensional plot and activation force profile do not provide such function in the MSC.Marc after-treatment system by pretty troublesome operation, so, be sizable for the difficulty of aftertreatment part.Native system aftertreatment subsystem provides data processing function, can the result of calculation of temperature field and stress-strain field be further processed, to reduce the shared storage space of destination file, and be converted into the file layout of being convenient to graphic presentation, finally the form with figure shows the result of calculation of temperature field and stress-strain field intuitively.Analog result output is by time step, unit number and the output of result's three parts, and the whole time step size of pressing is arranged the big minispread of pressing unit number in each time step again.The destination file of Chan Shenging is simple like this, and edits easily.Therefore, the position of each unit, correct reduction joint are determined in the distribution of the unit that system partly divides according to pre-treatment.
Concrete advantage of the present invention shows the following aspects:
1. the present invention has realized that main setting and parameter in the pre-treatment of temperature field fill in, and can provide parameter to make subroutine according to the user.The setting of Model Selection, boundary condition and other parameter of the pre-treatment of realization stress-strain field can be made and realize unit subroutine anyway.Solved among the Marc that parameter is various to be chosen difficulty and operate comparatively complicated problems.
2. native system is realized the comparatively complete data storage database system of function, can browse record, select to read in record, revise record, record deletion, the record uniqueness is judged and record is stored in addition, and material parameter and welding parameter etc. utilized the database file access, the storage of mass data and inquiry when having overcome numerical simulation.
3. the parameter and the mesh parameter of the form record cast of native system by message file read in can at model and the result is read in, and realization need not enter database also can implementation model and the choosing of result.
4. realize the selection of the output of temperature field and strain field data, formatd output then, reached the destination file that makes the Marc output system read and to handle.Realization with the Simulation result file read, data extract and functions such as data preparation and storage, and carry out data according to the desired form of various Presentation Functions as a result and prepare, realization saves as result data in the binary file, can use at any time when aftertreatment graphic presentation.
5. native system has been realized the aftertreatment Presentation Function of five kinds of figures, comprised graphical display function that the general user uses, and simple to operate, only need to click corresponding button and can realize processes such as the extraction of data and graphic presentation, allow the user conveniently obtain the result of aftertreatment.Observation and the summary of aftertreatment result by temperature field and strain field provide reference can for the simulation of solidification cracking.
6. native system utilizes the result of temperature field and stress-strain field, by a series of processing, extracts the solidification cracking activation force profile.Resistance curve and the activation force profile that is obtained by test can be drawn among the same figure, whether produce according to the driving force value of corresponding point and the solidification cracking of relatively judging of Resistance Value then, thereby realization is to the prediction of welding and solidifying crack.
Description of drawings
Fig. 1 is a system architecture diagram of the present invention, Fig. 2 is the operation interface figure of system of the present invention, the surface chart of Fig. 3 Gauss thermal source, the two ellipsoid thermal source surface charts of Fig. 4, temperature field 3-D display figure when Fig. 5 is the 25th second, strain field 3-D display figure when Fig. 6 is the 25th second, the contour cloud atlas in temperature field when Fig. 7 is the 25th second, the contour cloud atlas of strain field when Fig. 8 is the 25th second, Fig. 9 is thermal cycling curve figure, Figure 10 is the prognostic chart of solidification cracking.
Embodiment
Embodiment one: in conjunction with Fig. 1～10 explanation present embodiments, the finite element prediction system of the described welding and solidifying crack in virtual environment of present embodiment is made of pre-treatment subsystem 1, aftertreatment subsystem 2 and solidification cracking predicting subsystem 3;
Pre-treatment subsystem 1 is by interface operation module 1-1, MSC.Marc interface document module 1-2, subroutine .f file module 1-3 and call MSC.Marc software and carry out computing module 1-4 and constitute;
Aftertreatment subsystem 2 is made of MSC.Marc computed in software result treatment module 2-1, MatrixVB function module 2-2, Matlab software module 2-3 and image display module 2-4;
Solidification cracking predicting subsystem 3 by resistance curve call in module 3-1, judge module 3-2 and as a result output module 3-3 constitute;
Interface operation module 1-1 is used to read each parameter that is used to predict welding and solidifying crack of user's input or selection, and interface operation module 1-1 also is used to read the weld seam solidification cracking future position of user's input; MSC.Marc interface document module 1-2 is used for described each parameter that interface operation module 1-1 reads is changed into the discernible interface document form of MSC.Marc software, subroutine .f file module 1-3 is used for importing welding parameter according to the user and generates welding heat source, heat exchange and unit be subroutine anyway, MSC.Marc interface document module 1-2 and subroutine .f file module 1-3 generative process file are carried out and are called MSC.Marc software, call MSC.Marc software and carry out computing module 1-4 and be used to be implemented under the virtual environment and carry out the FEM (finite element) calculation of welding and solidifying crack and result of calculation is passed to MSC.Marc computed in software result treatment module 2-1 according to each parameter that the user imported; MSC.Marc computed in software result treatment module 2-1 is used to link MatrixVB function module 2-2 and Matlab software module 2-3, and obtain the graphical feedback information that generates by Matri xVB function module 2-2 and Matlab software module 2-3, demonstrate the figure as a result that each parametrical face according to user's input obtains by image display module 2-4 then; Resistance curve is called in module 3-1 and is used to call in known resistance curve figure, and judge module 3-2 is used to judge whether the prediction activation force profile and the resistance curve figure that are demonstrated by image display module 2-4 have intersection point; If output module 3-3 shows " generation solidification cracking " as a result, otherwise output module 3-3 shows " not producing solidification cracking " as a result.
The solidification cracking predicting subsystem: the prediction that carry out solidification cracking will be carried out the resistance of solidification cracking and the comparison of driving force, just will carry out the strain value under synthermal, the comparison of a promptly corresponding resistance and driving force.Driving force and resistance curve relatively be exactly to judge whether two curves have intersection point, if intersection point is arranged, then might produce solidification cracking, otherwise, will can not produce solidification cracking.The solidification cracking prognosis modelling as shown in figure 10.
Embodiment two: in conjunction with Fig. 1 and Fig. 2 present embodiment is described, the difference of present embodiment and embodiment one is: described interface operation module 1-1 is a Chinese interface operation module.So be provided with, be convenient to the only those of ordinary skill operation of meeting Chinese.
Embodiment three: in conjunction with Fig. 2 present embodiment is described, the difference of present embodiment and embodiment one is: described prognoses system can being used to of selecting predict that the argument structure of welding and solidifying crack is moulded dimension parameter, mesh parameter, material parameter, starting condition, boundary condition, welding parameter, welding heat source model parameter for the user.System is according to the parameter of user input, finishes interface document automatically and subroutine is made according to the form of file separately, submits to automatically, and realizes numerical simulation calculation to the temperature field and the stress/strain field of welding and solidifying crack.
The moulded dimension parameter: native system provides three kinds of form joints: open joint, corner joint and T connector.Needing the parameter of input is the length and width and the thickness of slab of plate, and the upper and lower plates size of angle joint and T connector etc.When finishing the input of parameter, system is stored in parameter in the system, and utilizes the input parameter preview graph of drawing, and allows the user contrast actual joint according to figure and makes amendment.
Mesh parameter: in the weld seam division density of grid with require differently away from the mesh-density of weld metal zone, the weld metal zone is the emphasis in the simulation, needs very big mesh-density, and is not the emphasis of simulation away from the weld metal zone, and is little for result's influence.Can waste very big computing time if whole joint all is divided into big density grid, and if weld metal zone and nearly seam district are because number of grid makes that inadequately calculating is coarse when all being divided into little density grid, precision is not high, does not reach requirement.In order to reach enough simulation precisions, native system is taked uneven grid dividing method, allows the user to import the Z-factor of grid.System offers the input frame of mesh parameter, and the grid preview graph is provided, so that the user is according to the preview graph parameter of making amendment.Mesh parameter mainly comprises: grid dividing quantity, weld width and the Z-factor of all directions.
Material parameter: system provides and is used for welding process and simulates necessary material parameter input frame, submits to MSC.Marc according to the parameter value of user's input, and sets up the form of material property automatically in MSC.Marc, realizes the setting of material property.The parameter of main input has: parameters such as density of material, latent heat, Poisson ratio, elastic modulus, yield strength, thermal expansivity, thermal conductivity and specific heat, wherein back five parameters are temperature variant parameters, should be with temperature-parameter list case form input parameter, to guarantee accuracy of simulation.
For the various a large amount of performance parameters of the input that reduces possible repeatability, system can realize the storage of material parameter and read in function.Comprise the expression character of system's adding and the identifier and the parameter value of various parameters in the material file.The material file of filling in can repeatedly read in and use and revise.
Starting condition: the parameter of starting condition setting is mainly the initial temperature or the environment temperature of model, utilizes the command stream form to submit to MSC.Marc then and is provided with.
Boundary condition:
(1) temperature field calculation of boundary conditions: the Temperature Field in Welding calculation of boundary conditions mainly comprises: convection heat transfer and radiation heat transfer.During research convection heat transfer' heat-transfer by convection border, be foundation with the Newton's law mainly, promptly heat-transfer fluid temperature is T, and being put in temperature is T
0Fluid in, heat transfer area is F, elapsed time t, then convection heat transfer' heat-transfer by convection is:
Qc＝a
c(T-T
0)Ft (1)
Research radiation border is a foundation with Si Difenban Boltzmann law mainly, and thermodynamic temperature is T, and the heat loss through radiation coefficient is C (C=ε C
0, C
0=5.67W/ (m
2K
4)), ε is a coefficient of blackness, then the radiation heat release is:
Q＝CT
4 (2)
The heat radiation boundary condition is to add on the outer elemental area of model with the form of command stream.
(2) stress-strain field calculation of boundary conditions: the computing method that adopt decoupling zero during the calculated stress strain field, when promptly carrying out the simulation of stress-strain field, model file in the time of at first will reading in temperature field calculating, utilize the boundary condition of temperature field result as the calculated stress strain field, and then apply other mechanical boundary condition, as: displacement boundary and mechanical boundary condition, submit at last and calculate, do not need to carry out the setting of model, grid, material property and welding parameter.
Welding parameter: welding parameter is a peculiar part in the welding, does not offer the function that the user imports welding parameter among the MSC.Marc, therefore, realize that the simulation of welding and solidifying crack must finish the setting of welding parameter by the form of subroutine.Native system offers the input function of user's welding parameter, with intuitively, the various parameters of name identification known.When each welding parameter fill in finish after, system also provides the selection function of heat source model.
The welding heat source model parameter: as Fig. 3 and Fig. 4, system provides two kinds of for reference and selections of heat source model, Gauss's heat source model and two ellipsoid heat source model.Select different thermal source forms according to moulded dimension, after selected heat source model, also need to import the thermal source parameter.Gauss's thermal source need be imported the spot radius; Two ellipsoid thermals source need be imported half a, the fusion penetration b of weld pool width, preceding semielliptical radius c1, four parameters of back semielliptical radius c2.
Embodiment four: the difference of present embodiment and embodiment one is: described MSC.Marc interface document module 1-2 is the procedure file of MSC.Marc, comprise the command stream of MSC.Mentat and the relevant parameter that system's assignment is given, the execution by described procedure file can realize the filling in and necessary setting and the submission that realizes subroutine .f file module 1-3 of various parameters in the MSC.Marc program.
Interface document is made and operation:
Parameter is filled in complete back just can submit simulated operation to, and the submission process of system is: write information file → write interface document (.proc file) → write subroutine file → write calls autoexec → execution autoexec → calling interface file → call subroutine → result and exports.
To be system be stored as file with the relevant parameter of model to message file, in order to calling when reading in the result or reading in model, the relevant information of model directly read in, and makes things convenient for the parameter assignment of aftertreatment.The parameter that message file inside comprises has: the mesh parameter of the length and width of model, thickness of slab and three axles and weld width and weld seam part and away from the deviation ratio of the grid dividing of commissure.
Interface document is the procedure file of MSC.Marc, relevant parameter of being given by command stream and the system's assignment of MSC.Mentat and necessary being provided with are formed, and the execution by procedure file can realize the filling in and necessary setting and the submission that realizes subroutine of various parameters in the MSC.Marc program.
The establishment of subroutine is by the establishment of the form of FORTRAN, and the various parameter assignment that the user is provided are to the variables corresponding place.The function that subroutine need be finished comprises: the setting on (1) heat radiation border mainly is the setting of coefficient of heat transfer, mainly is to realize by the film subroutine, and the external parameter assignment of utilizing subroutine to provide realizes the setting of coefficient of heat transfer.(2) setting on hot-fluid border mainly is the hot-fluid setting of thermal source, is welding parameter is realized that by the assign operation and the functional form of parameter parameter is submitted to and thermal source is made.
Autoexec is to solve interface document can realize directly moving and designing, and carries out the procedure file of MSC.Marc and must call by the autoexec .bat file of Dos.So, realize that the automatic startup of MSC.Marc realizes simulation, system writes autoexec with processing command automatically, calls autoexec at last and realizes the startup of MSC.Marc and the execution of procedure file.
Embodiment five: the difference of present embodiment and embodiment one is: described subroutine .f file module 1-3 is by the establishment of the form of FORTRAN, and the various parameter assignment that the user is provided are to the variables corresponding place; The function that subroutine .f file module 1-3 need finish comprises: the setting on (1), heat radiation border: mainly be the setting of coefficient of heat transfer, realize by the film subroutine that the external parameter assignment of utilizing subroutine to provide realizes the setting of coefficient of heat transfer; (2), the setting on hot-fluid border: mainly being the hot-fluid setting of thermal source, is that welding parameter is realized that by the assign operation and the functional form of parameter parameter is submitted to and thermal source is made.
Embodiment six: in conjunction with Fig. 3 and Fig. 4 present embodiment is described, present embodiment and embodiment one or fives' difference is: described subroutine .f file module 1-3 is made of Gauss's thermal source, two ellipsoid thermal source and unit life or death subroutine.
The making of subroutine .f file module:
According to user-selected heat source model and thermal source parameter, welding parameter is carried out assignment by the type of thermal source, obtain the hot input function of hot-fluid boundary condition.The thermal source subroutine is to write according to certain form, can be divided into Gauss's thermal source and two two kinds of thermal source format writes of ellipsoid thermal source.
(1) Gauss's thermal source: Gauss's thermal source is applicable to the situation of two dimensional model simulation, enables when being generally the simulation plate sheet welding, and what he represented is the Two dimensional Distribution state of thermal source.
(2) two ellipsoid thermals source: two ellipsoid heat source model are most popular three-dimensional heat source model in the present welding analog, and its realization not only needs welding parameter, and need the value of four parameters of input thermal source.
The parameter value that provides according to the user is to each the parameter assignment in the formula, writes in the .f file according to the form of FORTRAN routine, and subroutine address is submitted to, and MSC.Marc can call according to the address when calculating, and can realize the input of hot-fluid boundary condition.
(3) unit life or death subroutine: in the actual welding process, the metal in the molten bath is a liquid, flows freely, and not affected by force does not have strain accumulation yet.And in the analog computation process of MSC.Marc, strain is constantly accumulation, and the high more strain of temperature is big more, so just makes the serious distortion of analog result.So, should in computation process, handle by subroutine, the part stress and strain that temperature is surpassed the ceiling temperature of solid-liquid phase line is changed to 0, i.e. free state.This just need use unit subroutine anyway, and realizes result's selection by this subroutine.Unit subroutine anyway is the effective way that solves the molten bath strain accumulation, also is the advantage place of adopting decoupling algorithm.System adds unit subroutine anyway when calculating strain field, the liquidus temperature that provides according to the user judges whether the unit is killed.
Embodiment seven: in conjunction with Fig. 1, Fig. 5～9 explanation present embodiments, the difference of present embodiment and embodiment one is: the figure that image display module 2-4 demonstrates has: three-dimensional plot, contour cloud atlas, cyclic curve, cross-sectional view, longitudinal section and activation force profile; Described three-dimensional plot is meant the 3 dimensional drawing of temperature field and stress field, described contour cloud atlas is to utilize change in color to represent the size of the end value of respective point, can allow the user very clearly find out the temperature of relevant position or the scope of strain value, described cyclic curve is temperature or the strain over time curve of process of a certain point of fixity of expression in welding process, cross-sectional view is meant the scatter chart that extracts certain xsect near weld seam or melt run contour cloud atlas size or the distribution with the value that obtains near weld seam or the melt run temperature and ess-strain, longitudinal section is meant the scatter chart that extracts certain longitudinal section near weld seam or melt run contour cloud atlas size or the distribution with the value that obtains near weld seam or the melt run temperature field and ess-strain, and described activation force profile is meant the curve of certain any mechanical strain with the variation of temperature process.Other composition and annexation are identical with embodiment one.
The demonstration of contour cloud atlas: contour cloud atlas is to utilize change in color to represent the size of the end value of respective point, can allow the user very clearly find out the temperature of corresponding position or the scope of strain value.And can determine the direction that next step is operated according to contour cloud atlas, and determine that promptly which cross section is that the user comparatively is concerned about, when drawing sectional view, can use for reference the result of contour cloud atlas like this.Behind general user's analog temperature field and the stress-strain field, wish to obtain the size or the distribution of the value of near weld seam or the melt run temperature field and ess-strain, the scatter chart that so just needs certain cross section in the extraction model, therefore, system should provide result's cross section curve figure Presentation Function, comprises cross-section curve and longitudinal section curve map.
Curve display (follow and go back curve, activation force profile): because MATLAB and VB be when carrying out exchanges data, the system resource that takies is many, and speed is subjected to very big influence, therefore transfers plane curve drafting and conversion work to MatrixVB and finishes.This function library exists as the form of a dynamic link library (DLL), except such dynamic link library, no longer need other software support, from then on seek relevant data and power function during program run in the chained library and call support, having an enormous advantage aspect the hybrid programming and the system integration.Draw plane curve and do not have very big difference with MATLAB with MatrixVB, the data layout that they are supported has consistance.Can carry out the drafting of three-dimensional picture with the MatrixVB function library, but effect is not ideal enough.
By parameter the setting of forms is set, the user can select the position of xsect and longitudinal section, so only needs the user to click the demonstration that corresponding button just can be realized cross section curve.
Embodiment eight: the difference of present embodiment and embodiment seven is: the detailed process process of the demonstration of described three-dimensional plot is: (1), data are prepared, comprising matrix of consequence and coordinate vector; (2), to the matrix that Matlab submits result data and coordinate vector to, in Matlab, set up corresponding matrix; (3), send the request of drawing (comprising three-dimensional plot and cloud atlas), with the parameter that the provides operation of drawing; (4), Matlab draws as requested, and with graphics memory in buffer memory; (5), send and to get the figure request, figure is got from buffer memory among the MSC.Marc computed in software result treatment module 2-1 of described prognoses system; (6), by image display module 2-4 display graphics.
Embodiment nine: the difference of present embodiment and embodiment seven is: the manufacturing process of described cyclic curve is as follows: (1), carry out the selection of cyclic curve point with the parameter choice box; (2), read in the fort.96 data; (3), the position calculation unit of the point that provides according to the user number; (4), in result data, circulate and get a little, judge that each time step gets the same unit point, read result data; (5), the data with each taking-up deposit a vector in order in; (6), carry out graphic plotting, show then by MatrixVB picture function.
Cyclic curve is temperature or the strain over time process of a certain point of fixity of expression in welding process, has very important significance for the performance of research welding joint and the variation of state.
Embodiment ten: the difference of present embodiment and embodiment one is: select after the weld seam solidification cracking future position, system submits to next functional block with the horizontal ordinate of selected element or the ranks number of unit, concrete manufacturing process is as follows: (1), read the strain field data, and, read in the message file data according to the path of strain field; (2), carry out computing unit number according to the parameter of the message file of strain field; (3), seek this unit maximum temperature point (driving force is to finish from being solidified between the plastic zone, for the symmetry of image begins to draw from cooling), step writing time number according to unit number; (4), seek temperature near 800 degrees centigrade smallest point, step writing time number; (5), with the strain field data storage between maximum temperature and 800 degrees centigrade to column vector; (6), the path in the temperature field that provides according to the message file of strain field, read in the temperature field result data; (7), according to the time step of maximum temperature and 800 degrees centigrade number, the data in temperature field are put in order by time step deposits the row vector in; (8), be X-axis with the temperature field data, be that the Y-axis mapping promptly gets activation force profile with the strain field data; (9), by above processing procedure, can obtain the solidification cracking activation force profile, it and material resistance curve are compared just can judge whether solidification cracking produces then, reach the prediction solidification cracking purpose.
Claims (10)
1, a kind of finite element prediction system of welding and solidifying crack in virtual environment, described prognoses system is made of pre-treatment subsystem (1), aftertreatment subsystem (2) and solidification cracking predicting subsystem (3); It is characterized in that:
Pre-treatment subsystem (1) is by interface operation module (1-1), MSC.Marc interface document module (1-2), subroutine .f file module (1-3) and call MSC.Marc software execution computing module (1-4) formation;
Aftertreatment subsystem 2 is made of MSC.Marc computed in software result treatment module 2-1, MatrixVB function module (2-2), Matlab software module (2-3) and image display module (2-4);
Solidification cracking predicting subsystem (3) by resistance curve call in module (3-1), judge module (3-2) and as a result output module (3-3) constitute;
Interface operation module (1-1) is used to read each parameter that is used to predict welding and solidifying crack of user's input or selection, and interface operation module (1-1) also is used to read the weld seam solidification cracking future position of user's input; MSC.Marc interface document module (1-2) is used for described each parameter that interface operation module (1-1) reads is changed into the discernible interface document form of MSC.Marc software, subroutine .f file module (1-3) is used for importing welding parameter according to the user and generates welding heat source, heat exchange and unit be subroutine anyway, MSC.Marc interface document module (1-2) and subroutine .f file module (1-3) generative process file are carried out and are called MSC.Marc software, call MSC.Marc software and carry out computing module (1-4) and be used to be implemented under the virtual environment and carry out the FEM (finite element) calculation of welding and solidifying crack and result of calculation is passed to MSC.Marc computed in software result treatment module (2-1) according to each parameter that the user imported; MSC.Marc computed in software result treatment module (2-1) is used to link MatrixVB function module (2-2) and Matlab software module (2-3), and obtain the graphical feedback information that generates by MatrixVB function module (2-2) and Matlab software module (2-3), demonstrate the figure as a result that each parametrical face of importing according to the user obtains by image display module (2-4) then; Resistance curve is called in module (3-1) and is used to call in known resistance curve figure, and judge module (3-2) is used for judging whether the prediction activation force profile and the resistance curve figure that are demonstrated by image display module (2-4) have intersection point; If output module (3-3) shows " generation solidification cracking " as a result, otherwise output module (3-3) shows " not producing solidification cracking " as a result.
2, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 1 is characterized in that: described interface operation module (1-1) is a Chinese interface operation module.
3, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 1 is characterized in that: described prognoses system can being used to of selecting predict that the argument structure of welding and solidifying crack is moulded dimension parameter, mesh parameter, material parameter, starting condition, boundary condition, welding parameter, welding heat source model parameter for the user.
4, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 1, it is characterized in that: MSC.Marc interface document module (1-2) is the procedure file of MSC.Marc, comprise the command stream of MSC.Mentat and the relevant parameter that system's assignment is given, the execution by described procedure file can realize the filling in and necessary setting and the submission that realizes subroutine .f file module (1-3) of various parameters in the MSC.Marc program.
5, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 1, it is characterized in that: subroutine .f file module (1-3) is by the establishment of the form of FORTRAN, and the various parameter assignment that the user is provided are to the variables corresponding place; The function that subroutine .f file module (1-3) need be finished comprises: the setting on (1), heat radiation border: mainly be the setting of coefficient of heat transfer, realize by the film subroutine that the external parameter assignment of utilizing subroutine to provide realizes the setting of coefficient of heat transfer; (2), the setting on hot-fluid border: mainly being the hot-fluid setting of thermal source, is that welding parameter is realized that by the assign operation and the functional form of parameter parameter is submitted to and thermal source is made.
6, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 1 or 5 is characterized in that: described subroutine .f file module (1-3) by Gauss's thermal source, two ellipsoid thermal source and unit anyway subroutine constitute.
7, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 1 is characterized in that: the figure that image display module (2-4) demonstrates has: three-dimensional plot, contour cloud atlas, cyclic curve, cross-sectional view, longitudinal section and activation force profile; Described three-dimensional plot is meant the 3 dimensional drawing of temperature field and stress field, described contour cloud atlas is to utilize change in color to represent the size of the end value of respective point, allow the user very clearly find out the temperature of relevant position or the scope of strain value, described cyclic curve is temperature or the strain over time curve of process of a certain point of fixity of expression in welding process, cross-sectional view is meant the scatter chart that extracts certain xsect near weld seam or melt run contour cloud atlas size or the distribution with the value that obtains near weld seam or the melt run temperature and ess-strain, longitudinal section is meant the scatter chart that extracts certain longitudinal section near weld seam or melt run contour cloud atlas size or the distribution with the value that obtains near weld seam or the melt run temperature field and ess-strain, and described activation force profile is meant the curve of certain any mechanical strain with the variation of temperature process.
8, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 7 is characterized in that: the detailed process process of the demonstration of described three-dimensional plot is: (1), data are prepared, comprising matrix of consequence and coordinate vector; (2), to the matrix that Matlab submits result data and coordinate vector to, in Matlab, set up corresponding matrix; (3), send the request of drawing, with the parameter that the provides operation of drawing; (4), Matlab draws as requested, and with graphics memory in buffer memory; (5), send and to get the figure request, figure is got from buffer memory in the MSC.Marc computed in software result treatment module (2-1) of described prognoses system; (6), by image display module (2-4) display graphics.
9, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 7 is characterized in that: the manufacturing process of described cyclic curve is as follows: (1), carry out the selection of cyclic curve point with the parameter choice box; (2), read in the fort.96 data; (3), the position calculation unit of the point that provides according to the user number; (4), in result data, circulate and get a little, judge that each time step gets the same unit point, read result data; (5), the data with each taking-up deposit a vector in order in; (6), carry out graphic plotting, show then by MatrixVB picture function.
10, the finite element prediction system of welding and solidifying crack in virtual environment according to claim 1, it is characterized in that: select after the weld seam solidification cracking future position, system submits to next functional block with the horizontal ordinate of selected element or the ranks number of unit, concrete manufacturing process is as follows: (1), read the strain field data, and, read in the message file data according to the path of strain field; (2), carry out computing unit number according to the parameter of the message file of strain field; (3), seek this unit maximum temperature point, step writing time number according to unit number; (4), seek temperature near 800 degrees centigrade smallest point, step writing time number; (5), with the strain field data storage between maximum temperature and 800 degrees centigrade to column vector; (6), the path in the temperature field that provides according to the message file of strain field, read in the temperature field result data; (7), according to the time step of maximum temperature and 800 degrees centigrade number, the data in temperature field are put in order by time step deposits the row vector in; (8), be X-axis with the temperature field data, be that the Y-axis mapping promptly gets activation force profile with the strain field data; (9), by above processing procedure, can obtain the solidification cracking activation force profile, it and material resistance curve are compared just can know whether solidification cracking produces then, reach the prediction solidification cracking purpose.
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| CN110362926B (en) * | 2019-07-17 | 2023-02-07 | 佛山科学技术学院 | Copper alloy flat plate butt welding thermal crack prediction method based on ansys |
| CN113312823A (en) * | 2021-06-08 | 2021-08-27 | 广州颖力土木科技有限公司 | Finite element post-processing data processing method, system, equipment and storage medium |
| CN113312823B (en) * | 2021-06-08 | 2023-12-19 | 广州颖力科技有限公司 | Finite element post-processing data processing method, system, equipment and storage medium |
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