KR20170101700A - Method for Obtaining the Materila Data of Composite Fiber Reinforced Plastics by Changing Design Condition - Google Patents
Method for Obtaining the Materila Data of Composite Fiber Reinforced Plastics by Changing Design Condition Download PDFInfo
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- KR20170101700A KR20170101700A KR1020160024589A KR20160024589A KR20170101700A KR 20170101700 A KR20170101700 A KR 20170101700A KR 1020160024589 A KR1020160024589 A KR 1020160024589A KR 20160024589 A KR20160024589 A KR 20160024589A KR 20170101700 A KR20170101700 A KR 20170101700A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B41/00—Arrangements for controlling or monitoring lamination processes; Safety arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Reinforced Plastic Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The method for obtaining CFRP physical property data according to the disclosed design conditions of the present invention comprises the steps of a) inputting basic physical property test data obtained by a basic experiment of carbon fiber composite material composed of carbon fiber and resin (CFRP) Receiving; b) By using the basic physical property test data of the CFRP inputted in the step a) and the fiber longitudinal modulus of the carbon fibers constituting the CFRP and the matrix poisson's ratio of the resin, (FVR) of a carbon fiber and a resin, and a void volume ratio (VVR) of a CFRP; c) receiving a lamination condition including a lamination angle and a thickness of CFRP from a user; And d) obtaining physical property data of CFRP according to the lamination conditions using the physical properties of each of the carbon fibers and the resin obtained in the step b), FVR, VVR and the lamination condition of the CFRP inputted in the step c) .
Description
More particularly, the present invention relates to a method for obtaining CFRP physical property data according to a design condition, and more particularly to a CFRP method for obtaining CFRP physical property data according to design conditions, And CFRP physical property data acquisition methods according to design conditions that can be obtained by element analysis.
The issue of lightweight design is becoming important as a way to improve fuel efficiency of automobiles. Lightweight design is the ultimate goal of finding the ideal balance between the functional requirements that a product requires and the need to create the lightest weight.
In order to realize a lightweight design, we are making efforts in the field of automobiles, such as automobile assemblies and parts, to reduce the weight of the car body. This is because it is the body that occupies the largest part of the total weight of the vehicle.
Interest in lightweight materials such as aluminum alloys or carbon composites has been increasing to lower the weight of the body. In particular, carbon composites can be designed to be as low in weight as possible, with constant strength and rigidity, and such designs can be achieved through innovative materials.
CFRP (Carbon Fiber Reinforced Plastics) is a plastic composite material reinforced with carbon fiber. It is a high-tech composite material attracting attention as a lightweight structural material with high strength and high elasticity.
Referring to FIG. 1, the CFRP is made of a resin such as a carbon fiber and a plastic. The carbon fiber is an anisotropic material having a directionality. The properties of the carbon fiber are different depending on the carbon fiber constituting method (lamination direction) and thickness. The properties of the resin vary depending on the type, curing time and temperature. In addition, the physical properties also vary depending on the ratio of carbon fiber to resin (Fiber Volume Ratio (FVR)) and CFRP (Void Volume Ratio: VVR). Therefore, CFRP is highly variable and difficult to predict, depending on the complex design elements of these two materials.
In this way, the CRRP requires different experiments every time the material properties are changed every time the manufacturing method is changed according to the material. Therefore, it requires a lot of time and labor, resulting in a problem of cost increase.
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a carbon fiber composite material (CFRP) The present invention provides a CFRP physical property data acquisition method according to a design condition to be obtained.
According to the present invention, there is provided a method for obtaining CFRP physical property data according to a design condition, comprising the steps of: a) performing a basic physical property test obtained by a basic experiment of carbon fiber composite material composed of carbon fiber and resin (Composite Fiber Reinforced Plastics Receiving data from a user; b) By using the basic physical property test data of the CFRP inputted in the step a) and the fiber longitudinal modulus of the carbon fibers constituting the CFRP and the matrix poisson's ratio of the resin, (FVR) of a carbon fiber and a resin, and a void volume ratio (VVR) of a CFRP; c) receiving a lamination condition including a lamination angle and a thickness of CFRP from a user; And d) obtaining physical property data of CFRP according to the lamination conditions using the physical properties of each of the carbon fibers and the resin obtained in the step b), FVR, VVR and the lamination condition of the CFRP inputted in the step c) .
In the step a), the basic physical property test data includes
The physical property data of the CFRP obtained in the step d) includes a modulus, a possion's ratio, a stress, and a strain of each direction.
The physical property data of the CFRP according to the lamination conditions obtained in the step d) may be displayed in the form of a graph such as a carpet plot and displayed on a display unit screen.
According to the present invention, since the mechanical properties of the CFRP can be obtained by inputting only basic data and basic data of the basic experiment without obtaining the mechanical property data by the separate experiment every time the manufacturing method according to the design conditions is changed, It is possible to easily and conveniently obtain the CFRP having the strength and rigidity desired to be applied to the product or the part to be applied, thereby remarkably saving the time and cost.
1 is a view showing the structure of a general carbon fiber composite material (CFRP)
2 is a flow chart of a CFRP property data acquisition method according to a design condition according to an embodiment of the present invention,
3 is an illustration of five test pieces used in the basic experiment of CFRP,
4 is a view for explaining a basic experiment of CFRP,
5 is an exemplary screen of a MCA (Material Constituent Analysis) module, which is a finite element analysis program of a computer apparatus used in the present invention,
FIGS. 6 and 7 are views showing the results of physical properties of the carbon fibers and the resin, respectively, performed by the MCA module of FIG. 5,
8 is a graph comparing the physical properties of the carbon fiber and the resin applied by the MCA module of FIG. 5,
9 is an exemplary screen of a GENOA_PFA module which is a finite element analysis program of a computer apparatus used in the present invention,
FIGS. 10 and 11 are views showing a physical property result of the CFRP executed by the GENOA_PFA module of FIG. 9,
FIG. 12 is a graph showing a result of various lamination conditions (lamination angle and two systems) according to the present invention in the form of a graph such as a Carpet Plot.
These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings.
(Example)
Hereinafter, a CFRP property data acquisition method according to a design condition according to an embodiment of the present invention will be described in detail with reference to FIG.
First, basic physical property test data according to a basic experiment of a carbon fiber composite material (CFRP) is obtained and inputted to a computer device for implementing the present invention (S110). The basic properties refer to at least five basic
Thereafter, using the input basic data of CFRP, the axial modulus of the carbon fibers constituting the CFRP, and the matrix ratio of the resin, The fiber volume ratio (FVR) between the carbon fiber and the resin and the void volume ratio (VVR) of the CFRP are obtained (S120).
The basic physical property test data of the CFRP, the axial modulus of the carbon fiber, and the fiber information of the resin are input to the computer device to obtain the properties of each of the carbon fiber and the resin.
The fiber longitudinal modulus of the carbon fiber and the matrix poisson's ratio information of the carbon fiber are disclosed by the makers of the respective products. Further, the FVR and VVR are data obtained by repeated experimental results. If the basic physical property test data of CFRP, the axial modulus of the carbon fiber, and the fiber information of the resin are inputted, the device of the present invention can be obtained.
The physical properties of each of the carbon fiber and the resin calculated here are the modulus, the Poisson ratio, and the strength of each direction.
Then, the stacking conditions including the stacking angle and the thickness of the CFRP are inputted from the user (S130).
Lastly, the CFRP physical property data according to the lamination condition is obtained (S140) by using the physical properties of the carbon fiber and the resin, the FVR, the VVR and the CFRP lamination conditions obtained in the above step.
The calculated CFRP physical property data is displayed in the form of a graph and displayed on the display unit screen (S150), and physical property results according to the respective lamination conditions can be displayed in the form of a graph such as a carpet plot. Therefore, the user can see the CFRP having the desired strength or rigidity in the graph, not in the experiment.
Thus, according to the present invention, since the mechanical properties of the CFRP can be obtained by inputting only basic data and basic data of the basic experiment, even if the mechanical property data is not obtained by a separate experiment every time the manufacturing method according to the material changes, There is an advantage that the CFRP having the strength and rigidity desired to be applied to a product or a part to which the CFRP is applied can be easily and conveniently obtained.
(Experimental Example)
CFRD Acquisition of Basic Property Test Data by Basic Experiment
The CRFP test specimen was prepared as shown in Fig. 3 in accordance with each ASTM standard, and a test for obtaining five basic physical property test data by applying an appropriate load using a tension jig, a compression jig, and a shear jig is shown in Fig. 4 Respectively. The carbon fiber used in this experiment was 125 g /
CFRP's Basic physical property test data, CFRP Constituent Carbon fiber Axial elasticity Fiber longitudinal modulus and resin Pawasinui (Matrix Poisson's Ratio input
Referring to FIG. 5, the CFRP basic experimental physical property data, the fiber longitudinal modulus of the carbon fiber, and the matrix Poisson's ratio were measured using a MCA (Finite Element Analysis Program) (Material Constituent Analysis) module.
Fiber Longitudinal Modulus and Matrix Poisson's Ratio are input by the manufacturer (SK Chemical) because they provide data. The FVR and VVR apply this value to the MCA module as data by the result of repeated experiments.
With carbon fiber Generate physical properties of each resin
As a result of applying the above MCA module, the physical properties of carbon fiber and resin are shown in Fig. 6 (carbon fiber properties) and Fig. 7 (resin properties).
In order to make sure that the properties of carbon fiber and resin properties are the same as those of actual test results, the carbon fiber / matrix properties and the base stress-strain Data were obtained. The finite element analysis was carried out under the same conditions as the actual basic experiment, and the results of the basic experiment and the finite element analysis were almost similar to each other as shown in FIG.
In the lamination condition Following CFRP's Acquire property
The physical properties, FVR, VVR, and CFRP lamination conditions of the carbon fiber and the resin obtained in the above experiment are input to the GENOA_PFA module, which is a finite element analysis program of the computer apparatus of the present invention, as shown in FIG. 9 to obtain the properties of CFRP do. Here, the lamination conditions of the CFRP are a lamination angle (Angle) and a thickness (20 layers, thickness of each layer: 0.115 (mm)). The physical properties, FVR and VVR values of the carbon fiber and the resin are values obtained in the previous step, and therefore, they are automatically input as shown on the left side of the drawing.
FIGS. 10 and 11 show examples of physical property results of CFRP by execution of the GENOA_PFA module.
Carpet Plot graph display
According to the present invention, the results according to various lamination conditions (lamination angles and two systems) are displayed on the display unit of the computer device and in the form of a graph such as the Carpet Plot shown in FIG. 12, Can be seen in the graph rather than in the experiment.
Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that numerous modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims. And equivalents should also be considered to be within the scope of the present invention.
Claims (4)
b) By using the basic physical property test data of the CFRP inputted in the step a) and the fiber longitudinal modulus of the carbon fibers constituting the CFRP and the matrix poisson's ratio of the resin, (FVR) of a carbon fiber and a resin, and a void volume ratio (VVR) of a CFRP;
c) receiving a lamination condition including a lamination angle and a thickness of CFRP from a user;
d) obtaining physical property data of CFRP according to the lamination conditions by using the properties of each of the carbon fibers and the resin obtained in the step b), FVR, VVR and the lamination condition of the CFRP inputted in the step c) Wherein the CFRP physical property data is obtained according to a design condition.
In the step a), the basic physical property test data includes tensile 0 ° tension, 90 ° transverse tension, 0 ° compression, 90 ° compression, shear stress stress and modulus of CFRP according to design conditions.
The CFRP physical property data obtained in the step d) includes a modulus, a possion's ratio, a stress, and a strain of each direction. Data acquisition method.
Wherein the CFRP physical property data according to the lamination condition obtained in the step d) is displayed in a graph form such as a carpet plot and displayed on a display unit screen.
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| KR1020160024589A KR101809680B1 (en) | 2016-02-29 | 2016-02-29 | Method for Obtaining the Materila Data of Composite Fiber Reinforced Plastics by Changing Design Condition |
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| KR1020160024589A KR101809680B1 (en) | 2016-02-29 | 2016-02-29 | Method for Obtaining the Materila Data of Composite Fiber Reinforced Plastics by Changing Design Condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200062813A (en) * | 2018-11-27 | 2020-06-04 | 울산과학기술원 | System and method of predicting damage of carbon fiber composites |
| CN115290447A (en) * | 2022-08-10 | 2022-11-04 | 香港理工大学深圳研究院 | Modulus analysis test method of super-spiral composite fiber driver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20230167919A (en) | 2022-06-03 | 2023-12-12 | 울산과학기술원 | Method for predicting the tensile properties of chopped carbon fiber-reinforced composites manufactured by extrusion molding |
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| JP4867730B2 (en) | 2007-03-14 | 2012-02-01 | 横浜ゴム株式会社 | Evaluation method for buckling resistance of conveyor belt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200062813A (en) * | 2018-11-27 | 2020-06-04 | 울산과학기술원 | System and method of predicting damage of carbon fiber composites |
| CN115290447A (en) * | 2022-08-10 | 2022-11-04 | 香港理工大学深圳研究院 | Modulus analysis test method of super-spiral composite fiber driver |
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