CN109115383A - The Prediction method for fatigue life of cold extrusion Strengthening Hole - Google Patents
The Prediction method for fatigue life of cold extrusion Strengthening Hole Download PDFInfo
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- CN109115383A CN109115383A CN201710492275.5A CN201710492275A CN109115383A CN 109115383 A CN109115383 A CN 109115383A CN 201710492275 A CN201710492275 A CN 201710492275A CN 109115383 A CN109115383 A CN 109115383A
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention discloses a kind of Prediction method for fatigue life of cold extrusion Strengthening Hole.The Prediction method for fatigue life of cold extrusion Strengthening Hole of the invention comprises steps of determining that cold extrusion operating condition；According to identified cold extrusion operating condition, finite element analysis model is established using finite element analysis software；Setting cold-extrusion technology parameter simultaneously carries out Finite Element Simulation Analysis, obtains the simulation result of residual stress distribution and amount of interference；Cold extrusion test piece is made based on cold extrusion operating condition and cold-extrusion technology parameter；The residual stress distribution and amount of interference of cold extrusion test piece are measured；Finite element analysis model is modified according to comparing；Based on modified finite element analysis model, forecast analysis is carried out to fatigue life.The present invention can accurately and efficiently predict the fatigue life of the Cold-Expanded Hole under different cold-extrusion technology methods, and the selection and optimization for cold-extrusion technology method provides reliable basis.
Description
Technical field
The present invention relates to the fatigue life of the technical field of Prediction method for fatigue life more particularly to cold extrusion Strengthening Hole is pre-
Survey method.
Background technique
According to statistics, the fatigue failure of aircraft structure service phase investigation statistics analysis shows, 70% or more structural fatigue
Problem occurs in junction, it has also become one of most important root of aviation aircraft structural failure.It can using cold-extrusion technology
Achieve the purpose that improve fatigue life in the form of by improving residual stress, but different processes is to the shadow of fatigue life
Difference is rung, needs to obtain optimal process by analysis of experiments.
Fatigue life under specific cold-extrusion technology can be obtained by the method for test, but this method is in actual production
In the process, it needs to spend a large amount of manpower, financial resources and time.Therefore, it is necessary to the methods predicted using analysis of Fatigue-life to subtract
Few tested number, traditional Prediction method for fatigue life can be analyzed under different structure form with using software progress simulation analysis
Fatigue life, but influence of the different process to fatigue life can not be usually analyzed, there are still deficiencies for accuracy.
Therefore, need a kind of new simulating analysis, can be set up using less test cold-extrusion technology with it is tired
Relationship between the labor service life, efficiently to realize accurate, the reliable prediction for different cold-extrusion technology method fatigue lives.
Summary of the invention
The technical problem to be solved by the present invention is in order to overcome Prediction method for fatigue life in the prior art to be difficult to consider
It is influenced brought by different cold-extrusion technologies, and uses the cost of test method test fatigue life excessively high, excessive cycle scarce
It falls into, proposes a kind of Prediction method for fatigue life of cold extrusion Strengthening Hole.
The present invention is to solve above-mentioned technical problem by following technical proposals:
The present invention provides a kind of Prediction method for fatigue life of cold extrusion Strengthening Hole, it is characterized in that comprising it is following
Step:
Step 1: determining cold extrusion operating condition；
Step 2: establishing finite element analysis mould using finite element analysis software according to the identified cold extrusion operating condition
Type；
Step 3: cold-extrusion technology parameter is arranged and carries out finite element and imitates on the basis of the finite element analysis model
True analysis, obtains the simulation result of corresponding with the cold-extrusion technology parameter residual stress distribution and amount of interference；
Step 4: making cold extrusion test piece based on the cold extrusion operating condition and the cold-extrusion technology parameter；
Step 5: using residual stress measurement instrument and amount of interference measuring instrument, to the residual stress point of the cold extrusion test piece
Cloth and amount of interference measure；
Step 6: the simulation result of residual stress distribution and amount of interference that comparison step three obtains obtained with step 5 it is residual
The measurement result of residue stress distribution and amount of interference, and the finite element analysis model is modified according to comparison result, so that
It obtains the simulation result and approaches the measurement result；
Step 7: being made based on modified finite element analysis model using analysis of Fatigue-life software with residual stress distribution
Forecast analysis is carried out for fatigue life of the input quantity to cold extrusion Strengthening Hole.
Preferably, the cold extrusion operating condition includes aperture and/or the material properties of cold extrusion Strengthening Hole.
Preferably, the finite element analysis model established in step 2 includes test piece part and extruded rod part.
Preferably, the cold-extrusion technology parameter includes press ratio and/or extruding rate.
Preferably, including pair to the measurement that the residual stress distribution and amount of interference of the cold extrusion test piece carry out in step 5
The measurement of at least eight reference point.
Preferably, being executed respectively based on multiple groups cold-extrusion technology parameter Step 3: four, five to obtain the multiple groups cold extrusion
The simulation result and measurement result of the corresponding residual stress distribution of technological parameter and amount of interference, and according to institute in step 6
State the simulation result of the corresponding residual stress distribution of multiple groups cold-extrusion technology parameter and amount of interference and the comparison of measurement result
As a result the finite element analysis model is modified.
Preferably, the analysis of Fatigue-life software used in step 7 is MSC.fatigue.
Preferably, the forecast analysis in step 7 to the fatigue life of cold extrusion Strengthening Hole, is analyzed using fatigue life S-N
Method.
Preferably, also being adopted to mean stress in step 7 in the forecast analysis of the fatigue life of cold extrusion Strengthening Hole
It is corrected with goodman equation.
On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get each preferable reality of the present invention
Example.
The positive effect of the present invention is that:
The Prediction method for fatigue life of cold extrusion Strengthening Hole of the invention, can overcome the shortcomings of existing methods, using having
The test of limit helps to improve the validity of simulation and accuracy of established limit element artificial module, can accurately and efficiently predict
The fatigue life of Cold-Expanded Hole under different cold-extrusion technology methods provides reliably for the selection and optimization of cold-extrusion technology method
Foundation.Compared to existing method, the present invention can efficiently reduce test period and experimentation cost, reach rapid comparison analysis
Purpose.
Detailed description of the invention
Fig. 1 is a preferred embodiment of the present invention the flow chart of the Prediction method for fatigue life of cold extrusion Strengthening Hole.
Specific embodiment
With reference to the accompanying drawings of the specification, further the preferred embodiment of the present invention is described in detail, description below
To be illustrative, not limitation of the present invention, any other similar situation are still fallen among protection scope of the present invention.
In specific descriptions below, the term of directionality, such as "left", "right", "upper", "lower", "front", "rear", etc.,
The direction with reference to described in attached drawing uses.The component of the embodiment of the present invention can be placed in a variety of different directions, directionality
Term is for illustrative purposes and not restrictive.
Refering to what is shown in Fig. 1, the Prediction method for fatigue life of the cold extrusion Strengthening Hole of a preferred embodiment according to the present invention,
The following steps are included:
Step 1: determining cold extrusion operating condition, it is preferable that the cold extrusion operating condition includes aperture and the material of cold extrusion Strengthening Hole
Expect property；
Step 2: establishing finite element analysis mould using finite element analysis software according to the identified cold extrusion operating condition
Type, finite element analysis model preferably include test piece part and extruded rod part；
Step 3: cold-extrusion technology parameter is arranged and carries out finite element and imitates on the basis of the finite element analysis model
True analysis, obtains the simulation result of corresponding with the cold-extrusion technology parameter residual stress distribution and amount of interference, wherein described
Cold-extrusion technology parameter preferably includes press ratio and extruding rate；
Step 4: making cold extrusion test piece based on the cold extrusion operating condition and the cold-extrusion technology parameter；
Step 5: using residual stress measurement instrument and amount of interference measuring instrument, to the residual stress point of the cold extrusion test piece
Cloth and amount of interference measure；
Step 6: the simulation result of residual stress distribution and amount of interference that comparison step three obtains obtained with step 5 it is residual
The measurement result of residue stress distribution and amount of interference, and the finite element analysis model is modified according to comparison result, so that
It obtains the simulation result and approaches the measurement result；
Step 7: being made based on modified finite element analysis model using analysis of Fatigue-life software with residual stress distribution
Forecast analysis is carried out for fatigue life of the input quantity to cold extrusion Strengthening Hole.
Some preferred embodiments according to the present invention in the above-mentioned methods can be based on multiple groups cold-extrusion technology parameter point
It Zhi Hang not be Step 3: four, five to obtain the corresponding residual stress distribution of the multiple groups cold-extrusion technology parameter and amount of interference
Simulation result and measurement result, and according to the corresponding residual stress of the multiple groups cold-extrusion technology parameter in step 6
The comparison result of the simulation result and measurement result of distribution and amount of interference is modified the finite element analysis model.
Some preferred embodiments according to the present invention, to the residual stress distribution of the cold extrusion test piece in step 5
The measurement carried out with amount of interference includes the measurement at least eight reference point.
MSC.fatigue fatigue life can be used in the above method in further preferred embodiment according to the present invention
Software is analyzed, wherein fatigue life S-N analysis method specifically can be used, and mean stress is corrected using goodman equation.
The Prediction method for fatigue life of cold extrusion Strengthening Hole of the invention is illustrated for an application example again below.
Cold extrusion operating condition in this application example is, using the slotted liner bushing of Cr15Ni7Mo2Al to 1 piece of 4mm's
2060T8E30 aluminium lithium alloy plate carries out cold extrusion, and the final nominal diameter aperture in the hole of institute's cold extrusion is 4.420mm.
Firstly, being modeled using finite element emulation software ABAQUS, the technological parameter of use includes first hole aperture
4.530mm, duration 0.2s is squeezed, Finite Element Simulation Analysis is carried out to Cold Extrusion Process with this technological parameter, obtains residual stress
Distribution.
Secondly, carrying out cold extrusion specimen preparation with above-mentioned emulation operating condition, the 2060T8E30 aluminium lithium alloy plate of 4mm is carried out
Drilling, and the nominal value of 4.420mm is made up to using cold-extrusion technology, and using residual stress measurement instrument to residual stress into
Row test.For the adequacy for guaranteeing data, it is proposed that measured to no less than 10 holes, each hole takes no less than 8 measurement points.
Measurement result and simulation result are compared after completing measurement, and carry out certain amendment to simulation model.It just obtains as a result,
Modified finite element analysis model.It, can Cold-Expanded Hole under forecast analysis different technical parameters based on this analysis model
Fatigue life.
Different technological parameters is inputted, different residual stress point can be obtained using modified finite element analysis model
Cloth.Residual stress distribution is imported in analysis of Fatigue-life software MSC.fatigue again, establishes same forecasting fatigue operating condition,
And fatigue life S-N analysis method is chosen, processing is modified using Goodman equation for mean stress, and select maximum
Principal stress mode analyzes the multiaxis of stress, and the confidence level of fatigue life can for example be taken as 50%, just can predict to obtain different works
The fatigue life of Cold-Expanded Hole under skill parameter.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, many changes and modifications may be made, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (9)
1. a kind of Prediction method for fatigue life of cold extrusion Strengthening Hole, which is characterized in that itself the following steps are included:
Step 1: determining cold extrusion operating condition；
Step 2: establishing finite element analysis model using finite element analysis software according to the identified cold extrusion operating condition；
Step 3: cold-extrusion technology parameter is arranged and carries out finite element simulation point on the basis of the finite element analysis model
Analysis, obtains the simulation result of corresponding with the cold-extrusion technology parameter residual stress distribution and amount of interference；
Step 4: making cold extrusion test piece based on the cold extrusion operating condition and the cold-extrusion technology parameter；
Step 5: using residual stress measurement instrument and amount of interference measuring instrument, residual stress distribution to the cold extrusion test piece and
Amount of interference measures；
Step 6: the remnants that the simulation result of residual stress distribution and amount of interference that comparison step three obtains is obtained with step 5 are answered
The measurement result of power distribution and amount of interference, and the finite element analysis model is modified according to comparison result, so that institute
It states simulation result and approaches the measurement result；
Step 7: be based on modified finite element analysis model, using analysis of Fatigue-life software, using residual stress distribution as defeated
Enter amount and forecast analysis is carried out to the fatigue life of cold extrusion Strengthening Hole.
2. Prediction method for fatigue life as described in claim 1, which is characterized in that the cold extrusion operating condition includes cold-extruded pressure
Change aperture and/or the material properties in hole.
3. Prediction method for fatigue life as described in claim 1, which is characterized in that the finite element analysis established in step 2
Model includes test piece part and extruded rod part.
4. Prediction method for fatigue life as described in claim 1, which is characterized in that the cold-extrusion technology parameter includes squeezing
Rate and/or extruding rate.
5. Prediction method for fatigue life as described in claim 1, which is characterized in that the cold extrusion test piece in step 5
The measurement that residual stress distribution and amount of interference carry out includes the measurement at least eight reference point.
6. the Prediction method for fatigue life as described in any one of claim 1-5, which is characterized in that be based on multiple groups cold extrusion
Technological parameter executes respectively Step 3: four, five to obtain the corresponding residual stress point of the multiple groups cold-extrusion technology parameter
The simulation result and measurement result of cloth and amount of interference, and respectively corresponded in step 6 according to the multiple groups cold-extrusion technology parameter
Residual stress distribution and amount of interference simulation result and measurement result comparison result to the finite element analysis model carry out
Amendment.
7. Prediction method for fatigue life as described in claim 1, which is characterized in that the analysis of Fatigue-life used in step 7
Software is MSC.fatigue.
8. Prediction method for fatigue life as claimed in claim 7, which is characterized in that the tired of cold extrusion Strengthening Hole in step 7
The forecast analysis in labor service life, using fatigue life S-N analysis method.
9. Prediction method for fatigue life as claimed in claim 8, which is characterized in that cold extrusion Strengthening Hole in step 7
In the forecast analysis of fatigue life, also mean stress is corrected using goodman equation.
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| CN110765549A (en) * | 2019-10-16 | 2020-02-07 | 昆山六丰机械工业有限公司 | Method and system for analyzing structural stress of automobile casting |
| CN111209702A (en) * | 2020-01-02 | 2020-05-29 | 中车青岛四方机车车辆股份有限公司 | Method and device for simulating and testing alignment of rail train body strength |
| CN111241741A (en) * | 2020-03-25 | 2020-06-05 | 南京市特种设备安全监督检验研究院 | Crane wheel rail abrasion monitoring method based on residual stress influence interval correction |
| CN111737812A (en) * | 2020-05-13 | 2020-10-02 | 南京航空航天大学 | Fatigue life prediction method for secondary extrusion reinforced hole |
| CN112100766A (en) * | 2020-08-28 | 2020-12-18 | 北京航空航天大学 | Fatigue life prediction method for cold extrusion reinforced hole structure |
| CN112214846A (en) * | 2020-09-09 | 2021-01-12 | 浙江意动科技股份有限公司 | Method for reducing stress concentration |
| CN112906269A (en) * | 2021-02-08 | 2021-06-04 | 南通中远海运船务工程有限公司 | Method for prolonging fatigue life of complex structure of crude oil transfer barge |
| CN115795706A (en) * | 2022-10-26 | 2023-03-14 | 中国重型机械研究院股份公司 | Calculation method for prestress of large flat extrusion cylinder |
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| CN111241741B (en) * | 2020-03-25 | 2023-04-28 | 南京市特种设备安全监督检验研究院 | Crane wheel rail abrasion monitoring method based on residual stress influence interval correction |
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| CN112100766A (en) * | 2020-08-28 | 2020-12-18 | 北京航空航天大学 | Fatigue life prediction method for cold extrusion reinforced hole structure |
| CN112214846A (en) * | 2020-09-09 | 2021-01-12 | 浙江意动科技股份有限公司 | Method for reducing stress concentration |
| CN112906269A (en) * | 2021-02-08 | 2021-06-04 | 南通中远海运船务工程有限公司 | Method for prolonging fatigue life of complex structure of crude oil transfer barge |
| CN112906269B (en) * | 2021-02-08 | 2023-09-26 | 南通中远海运船务工程有限公司 | Method for prolonging fatigue life of complex structure of crude oil-to-barge |
| CN115795706A (en) * | 2022-10-26 | 2023-03-14 | 中国重型机械研究院股份公司 | Calculation method for prestress of large flat extrusion cylinder |
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