Patent Application
20180363176
The present disclosure belongs to a field of a three-dimensional preform weaving and particularly relates to a method for weaving a three-dimensional preform having a gradient structure.
Yarns in a three-dimensional preform have three or more directions and an internal yarn mostly is in a stretched state. As a reinforcement material, the three-dimensional preform is used for manufacturing an advanced composite material. It has been successfully used in high-tech fields such as aviation, aerospace, ships and rail traffics, and has good development prospect.
Currently, the three-dimensional preform is mainly implemented by a machine knitting process, a three-dimensional braiding process and a fine weave piercing process. According to a method for weaving a triaxial orthorhombic structure fabric using a machine knitting process disclosed by a Chinese patent CN1068607A, a movement of a heald frame is controlled by a multi-arm mechanism to form a multi-layer movable shed, yarns are inserted alternately at two sides using two or more weft insertion needles, and the yarns on a Z direction are divided into upper and lower layers and are also controlled by the heald frame. The fabric weaved with the method may be 20 mm-100 mm wide, but there are only two directions (0° and 90°) for fibers on an X-Y plane. Such method is limited by a device and cannot weave a three-dimensional preform having a gradient structure. For the fine weave piercing process, a carbon fiber plain fabric or satin fabric is pierced layer by layer using a steel needle array, and after a required fabric thickness is reached, carbon fiber bundles are used to replacing steel needles one by one to form a three-direction orthorhombic structure. The fine weave piercing process may implement the weaving of a large-thickness fabric. However, since the carbon fiber plain fabric or satin fabric is used for piercing, the method cannot weave the three-dimensional preform having the gradient structure on the plane.
Some embodiments of the present disclosure provide a method for weaving a three-dimensional preform having a gradient structure. The method is applied to a preform of a part on which different portions have different loading conditions and different functions.
A method for weaving a three-dimensional preform having a gradient structure provided by the present disclosure specifically includes the following steps:
(a) according to service environment, operating mode and loading condition of a required composite material parts, performance requirements of different functional locations of the parts are decomposed and determined, transition areas are divided;
(b) according to performance requirements of the different functional locations of the parts, different varieties and specifications of guide sleeves and fibers are selected, and different arrangement manners and arrangement spaces of the guide sleeves, winding manners of fibers and densities of winding layers of the fibers are designed;
(c) varieties, specifications, arrangement manners and arrangement spaces of guide sleeves in the transition areas are designed, and varieties, specifications and winding manners of fibers as well as densities of winding layers in the transition areas are designed, thereby implementing the transition areas smooth;
(d) a weaving sequence is determined in a computer according to layouts of the guide sleeves, the winding manners of the fibers on the functional locations and in the transition areas, then generate a fiber iterative instruction for layer-by-layer weaving;
(e) guide sleeves are arranged according to design requirements of the functional locations and the transition areas and then generate a guide sleeve array;
(f) a weaving mechanism is driven to select different fibers for subarea weaving layer by layer in the guide sleeve array till the weaving of all fiber layers is finished to obtain the three-dimensional preform having a gradient structure.
In an exemplary embodiment, the different functional locations in the step (a) are portions with different structural performances such as bearing a static load and dynamic load, an instability resistance and an impact resistance, or different functional performances such as an electromagnetic performance, a conductivity, a heat resistance, a fire resistance, a corrosion resistance and an absorbing property.
In an exemplary embodiment, varieties of the guide sleeves in the step (b) comprise a carbon fiber composite material, a glass fiber composite material, a titanium alloy and a stainless steel; varieties of the fibers comprise a carbon fiber, a glass fiber, an aramid fiber, an ultra-high molecular weight polyethylene fiber and a quartz fiber.
In an exemplary embodiment, arrangement manners of the guide sleeves in the steps (b) and (c) comprise a regular quadrangle, a rectangle, a triangle, a hexagon and an annular shape.
In an exemplary embodiment, a smooth transition manner of the transition area in the step (c) includes: when the functional locations are made of different fiber materials, the transition area is in gradual transition using multiple fibers according to a proportion.
In an exemplary embodiment, a smooth transition manner of the transition area in the step (c) includes: when volume fractions of the fibers on the functional locations are different, densities of fiber winding layers in the transition area are in a gradual transition.
In an exemplary embodiment, a smooth transition manner of the transition area in the step (c) includes: when arrangement spaces of the guiding sleeves on the functional locations are different, the arrangement spaces of the guiding sleeves in the transition area are in an equidifferent transition.
In an exemplary embodiment, a smooth transition manner of the transition area in the step (c) includes: when guiding sleeves on different functional locations are made of different materials, the guide sleeves in the transition area are in transition with considerations to a gradient layout of the materials of guide sleeves on the functional locations.
In an exemplary embodiment, the arrangement spaces of the guide sleeves in the step (b) are 1.0 mm-5.0 mm.
In an exemplary embodiment, the winding manners of the fibers in the step (b) are of a straight line shape or an ‘8’ shape.
In an exemplary embodiment, structures and sizes of fabric units of the transition area in the step (c) are continuously changed, and material compositions are also continuously changed and are uniformly transited from one attribute to another attribute.
Compared with the prior art, the present disclosure has the following advantages.
(1) Through a computer assistance to generate a fiber iterative instruction, the weaving and forming of the preform are implemented; during a weaving process, the reliance on the manpower is small and the reliability is good.
(2) The method can realize the weaving of the composite material three-dimensional preform having a gradient structure and is particularly applied to a composite material parts and the like on which different portions have different loading conditions.
(3) The method of the disclosure is also applied to preparing a composite material preform having multiple matrix types and reinforced by multiple materials.
The accompanying drawings are described here to provide a further understanding of the present disclosure. The schematic embodiments and description of the present disclosure are adopted to explain the present disclosure and do not form improper limits to the present disclosure. In the drawings:
The accompanying drawings include the following reference numbers:
1. full fiber weaving area; 2. transition area; 3. weaving area using carbon fiber composite material guide sleeves on a Z direction; 4. carbon fiber bundle guide sleeve; 5. carbon fiber; 6. carbon fiber composite material guide sleeve.
As shown in
(a), according to a service environment and an operating mode and loading condition of required composite material parts, performance requirements of different functional locations of the parts are decomposed and determined and transition areas are divided, thereby implementing primary division of gradient areas of the parts.
(b), according to performance requirements of the different functional locations of the parts, different varieties and specifications of guide sleeves and fibers are selected, and different arrangement manners and arrangement spaces of guide sleeves, winding manners of fibers and densities of winding layers of the fibers are designed, thereby obtaining guide sleeve arrangement and fiber winding implementation manners of each function gradient area.
(c), varieties, specifications, arrangement manners and arrangement spaces of guide sleeves in the transition areas are designed, and varieties, specifications and winding manners of fibers as well as densities of the winding layers in the transition area are designed, thereby implementing a smooth transition of the transition area so as to implement smooth transition of a material gradient and a structure gradient between the transition area and the functional locations.
(d), a weaving sequence is determined in a computer according to layouts of the guide sleeves and the winding manners of the fibers in the functional locations and the transition area to generate a fiber iterative instruction for layer-by-layer weaving. Through computer assistance to generate the fiber iterative instruction, a precision controllable weaving and forming of the preform can be implemented. During a weaving process, the reliance on the manpower is small and the reliability is good.
(e), guide sleeves are arranged according to design requirements of the functional locations and the transition area to generate a guide sleeve array having a changeable gradient of the functional locations and the transition area.
(f), a weaving mechanism is driven to select different fibers for subarea weaving layer by layer in the guide sleeve array till the weaving of all fiber layers is finished to obtain the three-dimensional preform having a gradient structure. The fibers on the functional locations and transition portions are continuous layer by layer, so the integrity of the preform is good.
According to a method for weaving the three-dimensional preform provided by the disclosure, by adopting the computer assistance to generate the fiber iterative instruction, the precision controllable weaving and forming of the preform can be implemented; during the weaving process, the reliance on the manpower is small and the reliability is good; meanwhile, the method for weaving the three-dimensional preform provided by the disclosure can realize the weaving of the composite material preform having the gradient structure, and is particularly applied to researching a composite material parts and the like on which different portions have different loading conditions; and furthermore, for the three-dimensional preform obtained by applying the method of the present disclosure, the fibers on the functional locations and the transition portions are continuous layer by layer, so the integrity of the preform is good.
In an exemplary embodiment, the different functional locations in the step (a) are portions with different structural performances such as bearing a static load and a dynamic load, an instability resistance and an impact resistance, or having different functional performances such as an electromagnetic performance, a conductivity, a heat resistance, a fire resistance, a corrosion resistance and an absorbing property.
In an exemplary embodiment, varieties of the guide sleeves in the step (b) comprise a carbon fiber composite material, a glass fiber composite material, a titanium alloy and a stainless steel; the varieties of the fibers include a carbon fiber, a glass fiber, an aramid fiber, an ultra-high molecular weight polyethylene fiber and a quartz fiber; arrangement manners of the guide sleeves in the steps (b) and (c) comprise a regular quadrangle, a rectangle, a triangle, a hexagon and an annular shape.
In an exemplary embodiment, a smooth transition manner of the transition area in the step (c) includes: when the functional locations are made of different fiber materials, the transition area is in constant speed transition using multiple fibers according to a proportional change of different fibers; when volume fractions of the fibers on the functional locations are different, the densities of fiber winding layers in the transition area are in a gradual transition; when arrangement spaces of the guiding sleeves on the functional locations are different, arrangement spaces of the guiding sleeves in the transition area are in equidifferent transition; when the guiding sleeves on different functional locations are made of different materials, the guide sleeves in the transition area are in transition with considerations to a gradient layout of the materials of the guide sleeves on the functional parts.
In an exemplary embodiment, in the present disclosure, the arrangement spaces of the guide sleeves in the step (b) are 1.0 mm-5.0 mm. The winding manners of the fibers in the step (b) are of a straight line shape or an ‘8’ shape.
In the present disclosure, the structures and the sizes of fabric units of the transition area in the step (c) are continuously changed, and the material compositions are also continuously changed and are uniformly transited from one attribute to another attribute.
In order to have a further understanding on the present disclosure, one specific embodiment of the present disclosure will be described below with reference to
Firstly, a fiber reinforced composite material preform for which a dimension of a carbon fiber cross section is 250 mm×80 mm×30 mm is made and the work condition is that a main body structure bears a static load and an X-direction left side bears parts of a dynamic load. A structure of the preform is divided into three portions. As shown in
Secondly, according to an overall loading condition, fibers are paved on X, Y and Z directions in a space, and an X direction and a Y direction fibers, penetrating the full-fiber weaving area 1 and the weaving area 3 of using the carbon fiber composite material guide sleeves on the Z direction, are applying T300-6K carbon fibers 5; the fiber winding manner is a straight line type and a layer density is 20 layers per cm; stranded T300-6K fiber bundles are used in the full-fiber weaving area 1 to take as Z-direction carbon fiber bundle guide sleeves 4; 2.0 mm-diameter carbon fiber composite material guide sleeves 6 are used by a Z direction of the weaving area 3 of using the carbon fiber composite material guide sleeves on the Z direction; the guide sleeves are provided in a layout of a regular quadrangle and the arrangement spaces all are 5.0 mm.
Thirdly, the transition area 2 gives considerations to the Z-direction carbon fiber bundle guide sleeves 4 and the carbon fiber composite material guide sleeves 6 and two sides of the transition area 2 are in gradient changeable symmetric transition, such that the change uniformity, the fiber continuity and the structural integrity of the material are effectively guaranteed.
Fourthly, according to arrangement manners of the guide sleeves in the full-fiber weaving area 1, the weaving area 3 of using the carbon fiber composite material guide sleeves on the Z direction and the transition area 2 of the functional locations, the guide sleeves in the full-fiber weaving area 1, the transition area 2 and the weaving area 3 of using the carbon fiber composite material guide sleeves on the Z direction are arranged, then generate a 36 (rows)*12 (columns) perform guide sleeve array.
Fifthly, fiber winding manners, densities of the winding layers and weaving sequences of the functional locations and the transition area are matched in a computer to generate an integral fiber iterative instruction for total 60 layers on the Z direction.
Sixthly, a weaving mechanism is driven to carry the fiber to weave in the guide sleeve array layer by layer till the weaving of all fiber layers is finished to obtain a three-dimensional perform having a gradient change of fiber arrangements.
The above is only an exemplary embodiment of the present disclosure and is not used to limit the present disclosure. To a person skilled in the art, the present disclosure may have various changes and variations. And any modification, equivalent replacement, replacement and the like made within the spirits and principles of the present disclosure all shall be included in a scope of protection of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201510935317.9 | Dec 2015 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2016/108412 | 12/2/2016 | WO | 00 |
