CN107451368A - Weld fatigue lifetime estimation method based on ANSYS platforms - Google Patents
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Abstract
The invention discloses a kind of weld fatigue lifetime estimation method based on ANSYS platforms, comprise the following steps：Build weld fatigue life appraisal platform；Data exchange is carried out with ANSYS softwares；Weld fatigue assesses pre-treatment；Call TCL/Tk data base management systems；Assess the weld fatigue life-span.The present invention has given full play to ANSYS advantage, with reference to main S N curve methods, realizes the sequencing assessed welded anti-fatigue performance, has worked out WSF softwares.TCL/Tk has good interface development function, it is possible to achieve good human-computer interaction function；TCL/Tk and ANSYS has good parameter interface, can realize that data mutually pass using parameter as carrier；Structural stress method has the advantages that grid insensitivity, main S N curves choose uniformity.It is engineering actually applicable instrument that the welding line structure anti-fatigue performance appraisal procedure WSF that triplicity is realized, which is introduced advanced foreign technology,.
Description
Technical field
The present invention relates to a kind of Fatigue Life Assessment technology, particularly a kind of weld fatigue life-span based on ANSYS platforms
Appraisal procedure.
Background technology
From the point of view of structure manufacture characteristic, welding structure have connectivity it is good, it is in light weight, easy to process, be easy to use
The advantages that automated production, be widely applied in complex equipment field, particularly welding technique constantly push away it is old go out
Newly, welding structure is improved more notablely applies status in these products.But during dynamic load is born, welding
Structure causes weld seam position stress concentration due to geometric discontinuity, has also therefore made it the thin of product structure reliability
Weak link, in complicated Service Environment, welded weld cracking turns into one of principal mode of structural failure.
The problem of in face of welding structure fatigue failure, for these years, each manufacturing including rail vehicle from
Top to bottm has been working hard administer, and achieves certain progress, improves welded safety of being on active service to a certain extent, but
Some understanding at present also still be present and apply upper mistaken ideas and difficult point.Such as welding structure fatigue problem is equal to metal
Fatigue problem, the problem of welded fatigue failure is attributed to welding quality, exaggerate the problem of welding residual stress influences
Deng.
For relevant issues, grid has been newly increased not in U.S.'s ASME BP＆C Section VIII Div 2Code standards
Computation of structure stress flow, the main S-N curve methods Fatigue Life Assessment flow of sensitivity, the fatigue failure to welding structure weld seam are entered
Special discussion is gone.Main S-N curve methods are that U.S. scientist foreign citizen of Chinese origin Dong Pingsha is taught in welding structure fatigue study field most
Recent studies on achievement, it can be good at explaining that conventional method is unable to interpretation problems in theory, be current welding structure anti-fatigue performance
The state-of-the-art theoretical tool assessed.This new method introduces the country by professor Wen Zhong of Dalian University Of Communications million, through in a few years
Practice test, it was demonstrated that above-mentioned theory to solve the welded fatigue problem of China railways rolling stock it is extremely suitable, whole
Individual welding structure security evaluation field, which exists, is extremely widely applied prospect.
But the application of new theory exactly currently solves the problems, such as that weld fatigue does not have suitable tools use, state there is also problem
Correlation function is more or less integrated with the software having outside, or but function limitation, or there is US military background, can not be big
Scale uses, and it is domestic have independent intellectual property right, for complicated welding engineering structure fatigue life prediction software still
Blank out.
During welding structure fatigue design or evaluation, when calculating or measuring stress, it should be noted that stress types, different answers
Power type is corresponding with different fatigue strength, or is corresponding with different S-N curve representation modes.The stress sorts master occurred at present
Have：Nominal stress (nominal stress), broad sense nominal stress, focus stress (geometrical stress), notch stress, structural stress etc.,
The solution of these stress is relatively more by external influence factor, such as mesh-density, stress species etc..
U.S. professor Dong Pingsha first proposed the insensitive structural stress method of grid, and the calculating of structural stress originates in list
First nodal force, by nodal force and then structural stress is calculated, the relation between nodal force and structural stress can represent as follows：
Weld seam membrane stress σ is calculated by formula (1)m：
Bead bend stress σ is similarly calculatedb, and then obtain structural stress：
σs=σm+σb (4)
In formula (1), n is weld seam unit number, liWeld seam element length, i=1,2 ..., n, fyiIt is i-th of weld seam list
In member under local coordinate system y directions line power, mxIt is the moment of flexure in x directions under local coordinate system on weld seam unit, FyiIt is unit
Nodal force, the line power f on weld seam cell node is calculated by formula (1)yi, calculated respectively on section of weld joint by (2) formula, (3) formula
Membrane stress σmWith bending stress σb, structural stress σ is calculated by (4) formulas.Structural stress σsEqual to membrane stress σmWith bending stress σb
Sum of the two, it is the stress of the weld seam caused by external force, toe of weld or root of weld, there is clear and definite physical significance, one can be passed through
Group foil gauge extrapolation obtains indirectly, can also be obtained with appropriate finite element method, it is reflected at weldering location or root of weld
Stress concentration.
According to test data and Method of Fracture Mechanics, can continue to derive some parameters related to the weld fatigue life-span,
It is including thickness, loading, stress concentration etc., these parameters are agglomerated together, just obtained one it is direct with fatigue life
Related stress parameters, equivalent structure stress Δ Ss：
In above formula, Δ σsIt is structural stress excursion, t is failure thickness, and I is load modes function, and m is fatigue here
Parameter of curve, according to fracture mechanics crack propagation law, the relation of stress and fatigue life is described based on equivalent structure stress,
Obtain Calculation of Fatigue Life formula：
Main S-N curve of the formula (6) i.e. based on equivalent structure stress, wherein C, h are test parameters, and (6) formula of utilization can obtain
To the associated fatigue life-span, and with grid insensitivity, the numerical stability of fatigue mechanisms.
At present at home, the also neither one practicality of welding structure weld fatigue life appraisal is carried out according to main S-N curve methods
Calculating instrument, when carrying out Fatigue Assessment, mainly carry out simple hand calculating according to theoretical, process is cumbersome, does not as a result protect
Barrier.
In external analysis of fatigue software, the only only a few Integrated Simulation function of the main S-N curve methods in part, such as FE-
Scientific research procedure SSM used in Safe Verity modules, Battle research institutes of the U.S. oneself etc..Or these instrument functions by
Limit, or by secrecy copyright restriction, it is impossible to construction joint Fatigue Life Assessment is carried out completely into domestic relevant industries, moreover,
Some application difficults also be present in these instruments：
1st, analysis tool and finite element analysis software are not Seamless integration-s, edition compatibility be present, and finite element software goes out
Existing version alternates, it is necessary to upgrade corresponding software.
2nd, in calculating process, interface is unfriendly, and weld seam definition required tight, and pre-treatment workload is big.
3rd, fault tolerance is bad, it is impossible to accurately provides error message, during analysis, going wrong, it is simple to provide
Error message, it is impossible to positioned rapidly according to error message, change pre-processing file.；
4th, relative program external call finite element solving result, solving speed is very slow when solving large-sized model file, easily false
Wait indefinitely.
The content of the invention
For solve prior art existing for above mentioned problem, the present invention to design it is a kind of can realize following purpose based on
The weld fatigue lifetime estimation method of ANSYS platforms：
1st, the Fatigue Life Assessment to welding structure weld seam is realized using structural stress, main S-N curves；
2nd, with finite element analysis software ANSYS Seamless integration-s, solves the problems, such as edition compatibility；
3rd, friendly interface, weld seam definition require loose, and pre-treatment workload is small, is adapted to engineering to be used with designer；
4th, fault tolerance is good, can accurately provide error message, can rapidly be positioned according to error message, changes pre-treatment text
Part；
5th, solving speed is fast, avoids solving seemingly-dead phenomenon caused by the problems such as cell type, constrained type.
To achieve these goals, technical scheme is as follows：Weld fatigue life appraisal based on ANSYS platforms
Method, comprise the following steps：
A, the weld fatigue life appraisal platform based on ANSYS is built
Based on ANSYS softwares, Calculation of Fatigue Life program is worked out using APDL language, interface is worked out using Tcl/Tk language
Program, it is Weld Structure Fatigue letter to build weld fatigue life appraisal platform WSF, WSF based on ANSYS
Claim；
B, data exchange is carried out with ANSYS softwares
" weld fatigue assessment " menu is clicked in ANSYS softwares and starts WSF program interfaces；
By TCL/Tk programmed function modules, described functional module includes weld fatigue and assesses pre-treatment WSF program interfaces
Module, weld fatigue life-span computing module and weld fatigue life appraisal Data Post module.WSF program interfaces pass through ans_
Sendcommand sends APDL orders and gives ANSYS softwares, and ans_getvalue gets parms data from ANSYS databases, ans_
Getvector orders obtain vector data from ANSYS databases.
C, weld fatigue assesses pre-treatment
C1, obtain bonding wire information：It is divided into two methods of manually input and automatic reading；During manually input, in bonding wire unit
Input block number, node number one by one in dialog box；Automatic read needs pre-set corresponding units group in FEM model, section
Point group, program prompting input bonding wire unit, node, user choose respective sets, define bonding wire automatically；
C2, importing/export bonding wire data：After obtaining bonding wire information in external text file, imported by import feature
Bonding wire data, export bonding wire information is individual files；
C3, editor's bonding wire unit, node, realize bonding wire editing and updating function, delete, search bonding wire；
C4, input bonding wire start node, the unit related to node is chosen in ANSYS softwares, judges bonding wire direction, from
It is dynamic to find adjacent node, bonding wire node, unit auto-sequencing are realized, reduces pre-treatment workload；
C5, given Initial crack length and failure thickness, realize data import/preserve function；
D, the weld fatigue life-span is calculated
Under WSF interfaces, on the basis of being handled before weld seam, different bonding wire structure stress and equivalent structure stress are calculated, are used
After family selection or input load spectrum, Fatigue Life Assessment is carried out, calculates bonding wire fatigue damage or cycle-index.
E, TCL/Tk data base management systems are called
WSF includes the TCL/Tk data base management systems that fatigue mechanisms are commonly used, and opens loading spectrum management system interface and carries out
Operate below：
Click on " opening database ", open existing lorry, integrated car load modal data；
Click on " importing database ", external load is composed and imports current database；
Click on " creating new storehouse ", manually enter load modal data, add a new loading spectrum data to data storehouse；
Click on " decomposition loading spectrum ", decompose current load modal data storehouse on request and preserved for multiple subdata bases；
Click on " increase ", increase current database data；
Click on " modification ", change current database data；
Click on " deletion ", delete current database data；
Click on " inquiry ", inquiry is combined by certain condition；
Click on " ToExcell " " ToText ", change current load modal data as Excell tables or txt text documents；
Click on " data summarization ", combined data, minimax, cycle-index etc.；
Click on " printing ", realize data-printing；
F, the weld fatigue life-span is assessed
Bonding wire Calculation of Fatigue Life is carried out based on equivalent structure stress, utilizes weld fatigue life appraisal Data Post mould
Block carries out data importing and data export, display curve map, block diagram, pie chart or cloud atlas, data friendship is carried out with Excell forms
Change.
Compared with prior art, the invention has the advantages that：
1st, the present invention has given full play to ANSYS APDL language, the advantage of TCL/Tk language, real with reference to main S-N curve methods
Show the sequencing assessed welded anti-fatigue performance, work out WSF softwares.
WSF be entirely autonomous intellectual property welding structure anti-fatigue performance assess software, can be widely used in locomotive,
The industries such as automobile, ship, Aero-Space, ocean platform, heavy-duty machinery.Design phase, welded fatigue can be predicted in advance
Life-span, the reasonability of feasibility and position while welding arrangement for structural design scheme provide theories integration.Product is on active service the stage, can
Enter Mobile state monitoring with data such as the acceleration according to actual measurement, displacement, power, calculate welded fatigue damage in real time, find out
The sensible factor of weld fatigue is influenceed, predicts the residual life of critical welding seams.
2nd, great advantage of the present invention is to combine TCL/Tk, ANSYS APDL language realizes the weldering of main S-N curve methods
Anti-fatigue performance is stitched to assess.TCL/Tk has good interface development function, it is possible to achieve good human-computer interaction function；TCL/
Tk and ANSYS has good parameter interface, can realize that data mutually pass using parameter as carrier；Structural stress method has grid not
The advantages that sensitiveness, main S-N curves choose uniformity.The welding line structure anti-fatigue performance appraisal procedure that triplicity is realized
It is engineering actually applicable instrument that WSF, which introduces advanced foreign technology,.
3rd, the uniformity of stress and S-N curves is assessed in ANSYS platforms
During welding structure fatigue design or evaluation, when calculating or measuring stress, it is first noted that stress types, different
Stress types (nominal stress, focus stress, notch stress etc.) be corresponding with different fatigue strength, while be corresponding with different
S-N curve representation modes.But the selection and calculating of above-mentioned stress and S-N curves often result in calculating and missed there is nonuniqueness
Difference is bigger than normal, and WSF softwares realize the method that structural stress method is combined with main S-N curve methods using APDL language, avoid above-mentioned ask
Topic, greatly improve the reliability of assessment.
4th, the convenient and practical property of software
The software interface of the present invention is based on TCL/Tk language, is developed in ANSYS platform interiors, friendly interface, complete function.
WSF softwares are not limited, not by transient node, rigidity by finite element analysis software version in ANSYS platform developments
Member, osculating element, non-linear unit influence, and are not influenceed by analysis type, stability is good.
WSF programs are not required excessively weld seam node, unit, it may not be necessary to are arranged in order, without providing weld seam list
The information such as first material, thickness, WSF programs can be completed with Automatic-searching completely, and WSF programs can be with automatic discrimination crack initiation side
To in the definition of cracking direction, calculating fatigue life information.
WSF has abundant mistake interception function, friendly miscue information, greatly improves user's experience sense.
5th, present invention incorporates current weld fatigue to assess most advanced theory, constructs Fatigue Assessment platform, utilizes this hair
It is bright, the engineer applied (advanced theory+software platform) of advanced foreign technology can be conveniently realized, is worked as using external advanced theoretical solution
Under most troubling welding structure Fatigue Failures.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Fig. 2 is T-shaped unilateral welding point load and constraint schematic diagram.
Fig. 3 is T-shaped unilateral welding point bonding wire node schematic diagram.
Fig. 4 is T-shaped unilateral welding point bonding wire cell schematics.
Fig. 5 deforms schematic diagram for T-shaped unilateral welding point.
Fig. 6 is T-shaped unilateral welding point stress schematic diagram.
Fig. 7 is that WSF programs start menu.
Fig. 8 is WSF program startup interfaces.
Fig. 9 is data base administration interface.
Figure 10 is material parameter inputting interface.
Figure 11 is that calculating finishes and drawn.
Figure 12 exports for text results.
Figure 13 is to click on the parameter interface that Damage buttons carry out Fatigue Assessment.
Figure 14 is Fatigue Assessment resulting text file.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is further described through to the present invention.
WSF programs operation embodiment is as follows：
According to flow shown in Fig. 1, the weld fatigue life-span of unilateral welding point T-shaped to one is assessed.
1. problem describes
As shown in Fig. 2 a T-shaped unilateral welding point, calculates position while welding fatigue behaviour, is established in HyperMesh
FEM model, while bonding wire node group (weld_1_n) and bonding wire unit group (weld_1_E), bonding wire section are generated in a model
Point and bonding wire unit are as shown in Figure 3-4.
2. obtain Finite element analysis results
HyperMesh generates FEM model, ANSYS calculation documents is exported using HyperMesh softwares, in ANSYS rings
File is imported in border to be calculated, and obtains T connector Finite element analysis results as seen in figs. 5-6.
3.WSF programs start
In ANSYS environment, click on " weld fatigue assessment " and start WSF programs, programs menu and startup interface such as Fig. 7-8
Shown, in above-mentioned startup interface, " analysis post processing " module can carry out i-th bonding wire (weld_i_n and weld_i_e) phase
The processing of information is closed, including defines, change, delete, import and export, loading spectrum, S-N can be realized in " other functions " module
Diagram database management function, as shown in Figure 9.
4.WSF Fatigue Assessment calculation process
" structural stress method Fatigue Assessment-ASME standards " module, activation structure are chosen under the WSF main interfaces shown in Fig. 8
Stress method calculation procedure.WSF_S computed push-buttoms are clicked on, eject equivalent structure Stress calculation parameter interface, as shown in Figure 10.Input
Calculating parameter, click on and determine, complete to calculate, generation equivalent stress calculates data, while draws equivalent stress curve, such as Figure 11 institutes
Show, bonding wire nodal information under different operating modes, bonding wire unit information, equivalent knot can be checked in output file SSResult.out
The information such as structure stress, as shown in figure 12.
On the basis of said structure Stress calculation, continue Fatigue Damage Calculation, click on Damage quick bottons, call
Analysis of Fatigue dialog box, the information such as input material type, Analysis of Fatigue type, confidence parameter, operating mode in dialog box,
As shown in figure 13, program calls equivalent structure stress calculating results and S-N parameters of curve to carry out Fatigue Damage Calculation automatically, calculates
As a result it is stored in DLResult.out destination files, as shown in figure 14.
The present invention is not limited to the present embodiment, any equivalent concepts in the technical scope of present disclosure or changes
Become, be classified as protection scope of the present invention.
Claims (1)
1. the weld fatigue lifetime estimation method based on ANSYS platforms, it is characterised in that：Comprise the following steps：
A, the weld fatigue life appraisal platform based on ANSYS is built
Based on ANSYS softwares, Calculation of Fatigue Life program is worked out using APDL language, interface journey is worked out using Tcl/Tk language
Sequence, it is Weld Structure Fatigue abbreviation to build weld fatigue life appraisal platform WSF, WSF based on ANSYS；
B, data exchange is carried out with ANSYS softwares
" weld fatigue assessment " menu is clicked in ANSYS softwares and starts WSF program interfaces；
WSF program interfaces by TCL/Tk programmed function modules, described functional module include weld fatigue assess pre-processing module,
Weld fatigue life-span computing module and weld fatigue life appraisal Data Post module；WSF program interfaces pass through ans_
Sendcommand sends APDL orders and gives ANSYS softwares, and ans_getvalue gets parms data from ANSYS databases, ans_
Getvector orders obtain vector data from ANSYS databases；
C, weld fatigue assesses pre-treatment
C1, obtain bonding wire information：It is divided into two methods of manually input and automatic reading；During manually input, talk with bonding wire unit
Input block number, node number one by one in frame；Automatic read needs pre-set corresponding units group, node in FEM model
Group, program prompting input bonding wire unit, node, user choose respective sets, define bonding wire automatically；
C2, importing/export bonding wire data：After obtaining bonding wire information in external text file, bonding wire is imported by import feature
Data, export bonding wire information is individual files；
C3, editor's bonding wire unit, node, realize bonding wire editing and updating function, delete, search bonding wire；
C4, input bonding wire start node, the unit related to node is chosen in ANSYS softwares, judges bonding wire direction, automatic seeking
Adjacent node is looked for, realizes bonding wire node, unit auto-sequencing, reduces pre-treatment workload；
C5, given Initial crack length and failure thickness, realize data import/preserve function；
D, the weld fatigue life-span is calculated
Under WSF interfaces, on the basis of being handled before weld seam, different bonding wire structure stress and equivalent structure stress, Yong Huxuan are calculated
Take or input load spectrum after, carry out Fatigue Life Assessment, calculate bonding wire fatigue damage or cycle-index；
E, TCL/Tk data base management systems are called
WSF includes the TCL/Tk data base management systems that fatigue mechanisms are commonly used, and it is following to open the progress of loading spectrum management system interface
Operation：
Click on " opening database ", open existing lorry, integrated car load modal data；
Click on " importing database ", external load is composed and imports current database；
Click on " creating new storehouse ", manually enter load modal data, add a new loading spectrum data to data storehouse；
Click on " decomposition loading spectrum ", decompose current load modal data storehouse on request and preserved for multiple subdata bases；
Click on " increase ", increase current database data；
Click on " modification ", change current database data；
Click on " deletion ", delete current database data；
Click on " inquiry ", inquiry is combined by certain condition；
Click on " ToExcell " " ToText ", change current load modal data as Excell tables or txt text documents；
Click on " data summarization ", combined data, minimax, cycle-index etc.；
Click on " printing ", realize data-printing；
F, the weld fatigue life-span is assessed
Bonding wire Calculation of Fatigue Life is carried out based on equivalent structure stress, entered using weld fatigue life appraisal Data Post module
Row data import and data export, display curve map, block diagram, pie chart or cloud atlas, data exchange are carried out with Excell forms.
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| CN108563878B (en) * | 2018-04-19 | 2022-01-11 | 大连交通大学 | Welding structure fatigue life calculation and welding quality grade confirmation integrated system |
| CN108563878A (en) * | 2018-04-19 | 2018-09-21 | 大连五州轨道科技有限公司 | Multi-functional welding structure Calculation of Fatigue Life confirms integrated integrated system with welding quality grade |
| CN111062151A (en) * | 2018-10-17 | 2020-04-24 | 湖南工业大学 | Vehicle structure random vibration fatigue life calculation method considering welding residual stress |
| CN112149256A (en) * | 2020-10-05 | 2020-12-29 | 西北工业大学 | Size optimization method of welding joint |
| CN112149256B (en) * | 2020-10-05 | 2022-08-12 | 西北工业大学 | Size optimization method of welding joint |
| CN113177331A (en) * | 2021-06-04 | 2021-07-27 | 中国船舶重工集团海装风电股份有限公司 | SN curve automatic generation method and system based on specific data model |
| CN113868911A (en) * | 2021-09-27 | 2021-12-31 | 大连理工大学 | Weld fatigue digital twin frame based on structural stress method |
| CN113868911B (en) * | 2021-09-27 | 2024-04-12 | 大连理工大学 | Weld fatigue digital twin frame generation method based on structural stress method |
| CN115673628A (en) * | 2022-09-07 | 2023-02-03 | 广州市机电技师学院(广州市机电高级技工学校、广州市机电高级职业技术培训学院) | Intelligent control method for welding robot |
| CN115673628B (en) * | 2022-09-07 | 2024-08-06 | 广州市机电技师学院(广州市机电高级技工学校、广州市机电高级职业技术培训学院) | Intelligent control method for welding robot |
| CN115488539A (en) * | 2022-10-12 | 2022-12-20 | 吉林大学 | Welding method for improving fatigue performance of lap fillet weld T-shaped joint |
| CN115796623A (en) * | 2023-02-07 | 2023-03-14 | 浪潮通用软件有限公司 | Welder management evaluation method, equipment and medium based on Internet of things |
| CN115796623B (en) * | 2023-02-07 | 2023-05-05 | 浪潮通用软件有限公司 | Welding machine management evaluation method, device and medium based on Internet of things |
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