CN103294862A - Simulation method for machining deformation of carbon-fiber-reinforced resin matrix composite - Google Patents
Simulation method for machining deformation of carbon-fiber-reinforced resin matrix composite Download PDFInfo
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Abstract
The invention provides a simulation method for machining deformation of carbon-fiber-reinforced resin matrix composite. The method includes: a, inputting modeling parameters in ANSYS software to build a geometric model; b, meshing the geometric model built in step a by a solid 185 unit, building a finite element model, and limiting the finite element model; c, simulating an autoclave process, calculating a solidification deformation value of the composite, and extracting a stress and strain distribution cloud graph; d, simulating a composite machining process by a method of killing or activating element to obtain machining deformation of the machined composite; and e, calculating the machining deformation value of the machined composite. The method has the advantages that simulation of accurate deformation prediction for the machining deformation of the carbon-fiber-reinforced resin matrix composite is realized, and the practical problems in composites engineering application are solved. The method is simple to operate and convenient to use. The software platform ANSYS is used, so that the method is well compatible and is convenient for technicians to master and use.
Description
Technical field
The present invention relates to the finite element simulation computing method, relate in particular to a kind of simulation analysis of the carbon fiber enhancement resin base composite material machining deformation based on the life and death elements method.
Background technology
Carbon fiber enhancement resin base composite material (CFRP) is to be that matrix, carbon fiber are a series of high-performance composite materials that strengthen body, adopt the preparation of advanced composite material method for processing forming with the resin.Carbon fiber enhancement resin base composite material is as a most important branch of advanced composite material, have distinct advantages such as specific strength and specific modulus height, designability be good, obtained using widely, become the rapidest, the most widely used class compound substance of development.
Autoclave technology is to make the important method of carbon fiber enhancement resin base composite material, has a wide range of applications in fields such as Aero-Space.Because compound substance has anisotropy, composite material structural member tends to take place curing deformation after solidifying, thereby has unrelieved stress in composite material structural member.In actual part is made, though but compound substance has the advantage of global formation, consider the problem of Mould Machining cost and feasibility, and compound substance is carried out machining remain ubiquitous phenomenon.
The compound substance machine work is the process that material is excised gradually, and along with the carrying out of cutting process, unrelieved stress discharges, and centre of gravity place changes, and original self-equilibrating condition is destroyed, and workpiece produces machining deformation inevitably.In order to realize the accurate forecast of the final distortion of compound substance, in order to take corresponding technological measure to improve the workpiece manufacturing accuracy in process of production, be necessary the machining deformation of compound substance is carried out sunykatuib analysis.At present, Chinese scholars has been carried out research extensively and profoundly to metal (especially aluminium alloy) machining deformation, but the compound substance machining deformation is but rarely had report.Aluminium alloy can produce internal stress in casting process, and is present in the aluminium alloy blank with the form of unrelieved stress, and the residualinternal stress that this is analogous to behind the composite material solidification is the immanent cause that machining deformation produces.The factor that produces the aluminium alloy machining deformation mainly comprises the release of unrelieved stress, the effect of cutting force, the effect of heat in metal cutting etc., and in general, it is principal element that unrelieved stress discharges.The correlative study of aluminium alloy machining deformation has important significance to the analog computation of compound substance machining deformation.
Summary of the invention
Owing to be machined into ubiquity in the Composite Preparation, sometimes processing capacity is also very big, consider that generally can there be unrelieved stress in compound substance in preparation, therefore adopt Finite Element Method that band unrelieved stress compound substance machining deformation is forecast simulation, so that it is significant to take corresponding technological measure to improve the workpiece manufacturing accuracy in process of production.
The objective of the invention is to propose the simulation method of a kind of carbon fiber enhancement resin base composite material when machining is out of shape based on above-mentioned design, realize the accurate distortion of carbon fiber enhancement resin base composite material machining deformation, especially the stress after the compound substance autoclave technology, the simulation analysis of strain regime, and calculate the machining deformation value of compound substance with this, the final distortion of compound substance is realized accurately forecast.
For this reason, the simulation method according to carbon fiber enhancement resin base composite material machining deformation of the present invention comprises the steps:
A) in ANSYS software, import modeling parameters, set up geometric model;
B) use the solid185 unit that the geometric model of setting up in the step a) is carried out grid and divide, set up finite element model, and finite element model is imposed restriction;
C) simulation autoclave technology, the curing deformation value of calculating compound substance is extracted relevant stress, Strain Distribution cloud atlas;
D) adopt life and death elements method analog composite material machining process, obtain the machining deformation of compound substance after the machine work;
E) the machining deformation value of computing machine processing back compound substance.
Advantageously, in step a), described modeling parameters comprises the density p (g/cm of compound substance
3) and in axial X(machine direction), in the face in the horizontal Y(face perpendicular to machine direction) and thickness direction Z on stretch modulus E(Pa), shear modulus G (Pa), Poisson ratio λ and thermal expansivity ALP(T
-1).
Advantageously, in step c), adopt multi-level curing deformation forecasting procedure simulation autoclave technology.
The present invention uses for reference the analogy method of aluminium alloy machining deformation, in simulation, the characteristics such as anisotropy of compound substance are taken into account, composite material solidification distortion forecast and machining deformation are combined, realize the accurate forecast of the final distortion of compound substance, and accurately be deformed into analysis foundation with composite material solidification distortion, realize the accurate distortion of carbon fiber enhancement resin base composite material machining deformation based on the life and death elements method, solved the practical problems during the compound substance engineering is used.This method is simple to operate, and is easy to use.Use software platform to be ANSYS, have favorable compatibility, make things convenient for the technician to grasp and use.
Description of drawings
More features of the present invention and advantage will be by understanding further describing better of embodiment below in conjunction with accompanying drawing.Wherein:
Fig. 1 is the indicative flowchart according to the simulation method of carbon fiber enhancement resin base composite material machining deformation of the present invention;
Fig. 2 is the synoptic diagram of the geometric model of the compound substance of foundation according to the present invention;
Fig. 3 carries out the synoptic diagram that the finite element model of setting up the back was divided and retrained to grid to geometric model shown in Figure 2;
Fig. 4 is the distortion cloud charts to compound substance generation curing deformation after the finite element model simulation autoclave technology;
Fig. 5 is the distortion cloud charts that adopts life and death elements method analog machine processing back compound substance to deform.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail.
At first need to prove, adopted the life and death element method that the unit that needs in the machine work to remove is killed in the simulation method of the present invention, so-called " killing " unit is not really the unit to be deleted from model, but its stiffness matrix be multiply by a very little factor.Factor default value generally gets 10
-6At this moment, be similar to and think that the stiffness matrix of unit is 0, the element stress vector also will become 0 value so.When therefore adopting finite element method for simulating to remove compound substance, it is 0 that the removal of unit can be equal to the elastic modulus that the unit is set.This is the theoretical foundation that life and death elements method analog composite material is removed.
Simplify for convenience, the present invention does following hypothesis: 1) the evenly distribution in resin for continuous fiber and fiber in the compound substance; 2) for simple laminated plate structure, in the accuracy requirement scope, simulation during curing deformation compound substance can be similar to think flexible; 3) effect of cutting force, heat in metal cutting is less to the machining deformation contribution in the machine work, can ignore in sunykatuib analysis.
In specific embodiment, choose T800 grade carbon fiber reinforced epoxy base composite material laminated plate as objective for implementation, in software platform ANSYS, realize the analogue simulation according to the carbon fiber enhancement resin base composite material machining distortion based on the life and death elements method of the present invention.Should be understood that the correlative study result who draws according to the present invention can be used as the basis and is generalized in the more complicated composite structure, in addition, based on principle of the present invention, also can adopt other similar analogue simulation softwares to be used as analog platform.
The workflow diagram of simulation method of the present invention mainly comprises the steps: as shown in Figure 1
A) set up geometric model
Consider that compound substance has anisotropy, need mechanics parameter and the thermal expansivity of input compound substance on three directions.In this embodiment, the relevant concrete parameter of the composite system that need import is as shown in table 1.
Table 1 compound substance modeling parameters
The geometric model of setting up behind the desired parameters in input under the ANSYS software environment as shown in Figure 2, wherein the A of zigzag fashion part keeps after machine work, the B part is removed in machine work.
B) set up finite element model
Use the solid185 unit that the geometric model of setting up is carried out grid and divide, set up finite element model, unit size is 1.5e
-3M.According to correlated condition, model is imposed restriction, for example three angle points at model retrain three, two, one degree of freedom respectively.The finite element analysis model of setting up as shown in Figure 3
C) simulation autoclave technology
Use multi-level curing deformation forecasting procedure, the technological process that the analog composite material experiences in autoclave.Because the anisotropy of compound substance can produce buckling deformation after the autoclave technology, and have residualinternal stress in compound substance.Consider the cure shrinkage effect in temperature-fall period thermal pinch and the solidification process, ignore the influence of mould, calculate the curing deformation that produces behind the composite laminated plate curing molding, extract the distortion cloud charts, the gained result as shown in Figure 4, wherein C partly is the compound substance part after the distortion, and D partly is the compound substance part before the distortion.
D) adopt life and death elements method analog composite material machining process
Based on the distortion of the laminate that obtains in the step c) and stress, Strain Distribution situation, use the life and death elements method that the unit that needs in the machine work to remove is killed, just remove the B part shown in Fig. 2, thereby the stress relief process in the machine work of analog composite material and the variation of laminate center of gravity, rebulid balance, obtain the final distortion situation of laminated plate structure.As shown in Figure 5, E partly finally is out of shape situation for the compound substance behind the machining deformation, and F partly is the compound substance part before the distortion.
E) the machining deformation value of computing machine processing back compound substance
Laminate with 0.6m*0.3m is example, fiber lay down layer [0/0/45/-45], and the final compound substance deformation values that uses method analog computation of the present invention to obtain is 95.95mm, wherein machining deformation value 1.8mm accounts for 2% of whole deformation values greatly.
At composite structure more under the complicated situation, large-scale reinforcement wall panel structure for example, it has many ribs, and all ribs, covering all will experience machining process, and the mach influence of each parts may produce stack.Employing simulation method according to the present invention comes band unrelieved stress compound substance machining deformation is forecast simulation, and then takes corresponding technological measure to improve the workpiece manufacturing accuracy, has great importance to making large and complex structure.
Above-described embodiment only is used for further specifying the emulated computation method of the carbon fiber enhancement resin base composite material machining distortion based on the life and death elements method of the present invention; but the present invention is not limited to embodiment; every foundation technical spirit of the present invention all falls in the protection domain of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment does.
Claims (3)
1. the simulation method of a carbon fiber enhancement resin base composite material machining deformation is characterized in that, described method comprises:
A) in ANSYS software, import modeling parameters, set up geometric model;
B) use the solid185 unit that the geometric model of setting up in the step a) is carried out grid and divide, set up finite element model, and finite element model is imposed restriction;
C) simulation autoclave technology, the curing deformation value of calculating compound substance is extracted stress, Strain Distribution cloud atlas;
D) adopt life and death elements method analog composite material machining process, obtain the machining deformation of compound substance after the machine work;
E) the machining deformation value of computing machine processing back compound substance.
2. the simulation method of carbon fiber enhancement resin base composite material machining deformation according to claim 1, it is characterized in that, in step a), described modeling parameters comprises the density of compound substance and compound substance stretch modulus, modulus of shearing, Poisson ratio and the thermal expansivity on horizontal (Y) and the thickness direction (Z) in axially (X), face.
3. the simulation method of carbon fiber enhancement resin base composite material machining deformation according to claim 1 is characterized in that, in step c), adopts multi-level curing deformation forecasting procedure simulation autoclave technology.
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Cited By (14)
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|---|---|---|---|---|
| CN104679943A (en) * | 2015-01-29 | 2015-06-03 | 大连理工大学 | Method for simulating fiber reinforced composite material cutting chip forming |
| CN104807698A (en) * | 2015-04-29 | 2015-07-29 | 山东大学 | Test method for poisson ratio of continuous fiber enhanced resin-based composite material |
| CN104834786A (en) * | 2015-05-15 | 2015-08-12 | 大连理工大学 | Microscopic simulation modeling method used in carbon fiber composite material removing process |
| CN105046031A (en) * | 2015-09-10 | 2015-11-11 | 哈尔滨工业大学 | Method predicting deformation quantity produced during aluminum alloy thin wall member machine processing |
| CN105160085A (en) * | 2015-08-24 | 2015-12-16 | 大连理工大学 | Simple implementation method for performing gradual homogenized prediction on thermal expansion coefficient of periodic composite material |
| CN107356478A (en) * | 2017-07-07 | 2017-11-17 | 吉林大学 | Long fiber reinforced thermoplastic composites Multiscale Simulation Method |
| CN108090242A (en) * | 2017-08-31 | 2018-05-29 | 镇江春环密封件集团有限公司 | The three-dimensional thermal-structural coupling analysis method of carbon fiber winding composite cylinder |
| CN108804790A (en) * | 2018-05-29 | 2018-11-13 | 西安理工大学 | A kind of fibre metal laminate curing deformation method for numerical simulation |
| CN111331884A (en) * | 2020-03-04 | 2020-06-26 | 中国科学院力学研究所 | Method and device for determining forming die of carbon fiber composite material reflecting surface structure |
| CN112149324A (en) * | 2020-08-28 | 2020-12-29 | 成都飞机工业（集团）有限责任公司 | Rapid modeling method for simulation verification of composite material tool compensation molded surface |
| CN112417724A (en) * | 2020-11-19 | 2021-02-26 | 贺州学院 | Calcium carbonate filled composite material mechanical property prediction method based on reverse modeling |
| CN113033051A (en) * | 2021-03-24 | 2021-06-25 | 天津中德应用技术大学 | Compression molding process optimization method for carbon fiber reinforced composite material sheet |
| CN117454698A (en) * | 2023-10-27 | 2024-01-26 | 华中科技大学 | Numerical simulation method for fiber drawing performance in concrete |
| CN117747033A (en) * | 2024-02-08 | 2024-03-22 | 北京理工大学 | Digital modeling method and modeling device for composite material grid structure |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104679943A (en) * | 2015-01-29 | 2015-06-03 | 大连理工大学 | Method for simulating fiber reinforced composite material cutting chip forming |
| CN104679943B (en) * | 2015-01-29 | 2018-01-26 | 大连理工大学 | A kind of emulation mode cut fibre reinforced composites chip and formed |
| CN104807698A (en) * | 2015-04-29 | 2015-07-29 | 山东大学 | Test method for poisson ratio of continuous fiber enhanced resin-based composite material |
| CN104834786B (en) * | 2015-05-15 | 2018-07-13 | 大连理工大学 | The thin sight emulation modelling method of carbon fibre composite removal process |
| CN104834786A (en) * | 2015-05-15 | 2015-08-12 | 大连理工大学 | Microscopic simulation modeling method used in carbon fiber composite material removing process |
| CN105160085A (en) * | 2015-08-24 | 2015-12-16 | 大连理工大学 | Simple implementation method for performing gradual homogenized prediction on thermal expansion coefficient of periodic composite material |
| CN105160085B (en) * | 2015-08-24 | 2018-05-15 | 大连理工大学 | The Simple Realizable Method of progressive homogenization predetermined period Thermal expansion coefficient of composites |
| CN105046031A (en) * | 2015-09-10 | 2015-11-11 | 哈尔滨工业大学 | Method predicting deformation quantity produced during aluminum alloy thin wall member machine processing |
| CN105046031B (en) * | 2015-09-10 | 2018-01-30 | 哈尔滨工业大学 | A kind of method for predicting deformation quantity caused by the machining of aluminum alloy thin wall member |
| CN107356478A (en) * | 2017-07-07 | 2017-11-17 | 吉林大学 | Long fiber reinforced thermoplastic composites Multiscale Simulation Method |
| CN107356478B (en) * | 2017-07-07 | 2019-10-15 | 吉林大学 | Long fiber reinforced thermoplastic composites Multiscale Simulation Method |
| CN108090242A (en) * | 2017-08-31 | 2018-05-29 | 镇江春环密封件集团有限公司 | The three-dimensional thermal-structural coupling analysis method of carbon fiber winding composite cylinder |
| CN108804790A (en) * | 2018-05-29 | 2018-11-13 | 西安理工大学 | A kind of fibre metal laminate curing deformation method for numerical simulation |
| CN108804790B (en) * | 2018-05-29 | 2022-04-12 | 西安理工大学 | Fiber metal laminated plate curing deformation numerical simulation method |
| CN111331884A (en) * | 2020-03-04 | 2020-06-26 | 中国科学院力学研究所 | Method and device for determining forming die of carbon fiber composite material reflecting surface structure |
| CN112149324A (en) * | 2020-08-28 | 2020-12-29 | 成都飞机工业（集团）有限责任公司 | Rapid modeling method for simulation verification of composite material tool compensation molded surface |
| CN112417724A (en) * | 2020-11-19 | 2021-02-26 | 贺州学院 | Calcium carbonate filled composite material mechanical property prediction method based on reverse modeling |
| CN113033051A (en) * | 2021-03-24 | 2021-06-25 | 天津中德应用技术大学 | Compression molding process optimization method for carbon fiber reinforced composite material sheet |
| CN113033051B (en) * | 2021-03-24 | 2023-09-12 | 天津中德应用技术大学 | Compression molding process optimization method for carbon fiber reinforced composite material sheet |
| CN117454698A (en) * | 2023-10-27 | 2024-01-26 | 华中科技大学 | Numerical simulation method for fiber drawing performance in concrete |
| CN117454698B (en) * | 2023-10-27 | 2024-05-07 | 华中科技大学 | Numerical simulation method for fiber drawing performance in concrete |
| CN117747033A (en) * | 2024-02-08 | 2024-03-22 | 北京理工大学 | Digital modeling method and modeling device for composite material grid structure |
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