CN116118196A - Continuous fiber 3D printing path design method based on force flow pipe load path - Google Patents
Continuous fiber 3D printing path design method based on force flow pipe load path Download PDFInfo
- Publication number
- CN116118196A CN116118196A CN202211730749.2A CN202211730749A CN116118196A CN 116118196 A CN116118196 A CN 116118196A CN 202211730749 A CN202211730749 A CN 202211730749A CN 116118196 A CN116118196 A CN 116118196A
- Authority
- CN
- China
- Prior art keywords
- area
- stress
- printing
- force flow
- path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
Abstract
The invention relates to a continuous fiber 3D printing path design method based on a force flow pipe load path, which comprises the following steps: constructing a force flow tube load path generation model according to finite element analysis results under the actual working conditions of the parts; dividing a part stress area according to the characteristics and distribution of the load path curve of the force flow pipe; according to the force flow pipe characteristics of each stress area, combining the main stress track line to determine a printing path and materials required for printing; and (3) carrying out manufacturing-oriented path optimization by combining an extrusion printing process according to the initially planned printing path. Compared with the prior art, the invention lays the continuous fiber with excellent axial stretching property in the main pulling area according to the load path of the force flow pipe, compactly fills the stress concentration part with the thermoplastic matrix material, optimizes the matrix material distribution of the light load area and the shearing force area, can effectively improve the integral strength and rigidity of the part, and realizes the light weight of the part on the premise of meeting the application geometric requirement.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a continuous fiber 3D printing path design method based on a force flow tube load path.
Background
The traditional 3D printing technology uses thermoplastic or thermosetting resin, gypsum, inorganic powder and the like as printing materials, and the strength and rigidity of a printing forming part are not high, so that the printing forming part cannot be used in the industrial field. While high performance fiber reinforced polymer composites are highly favored in the current research and industry, continuous fiber composites as reinforcements play a major role in load bearing in structural members of thermoplastic polymer materials, with good designability of fiber paths in 3D printing.
However, the internal reinforcing fibers of the parts designed by the 3D printing method are mostly in a mode of unidirectional filling, spiral filling and the like, or are arranged along a direction parallel to a contour curve based on a topological structure. The method is difficult to realize the weight reduction of the part on the premise of meeting the application geometric requirement, and the fiber reinforcement cannot well bear the transmission of the load in the main load direction, so that the part is easy to break at the position where the load is applied.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a continuous fiber 3D printing path design method based on a force flow pipe load path, which can realize the integrated design of light structure and enhanced mechanical property, improve the integral strength and rigidity of parts and realize the light weight of the parts on the premise of meeting the application geometric requirement.
The aim of the invention can be achieved by the following technical scheme: a continuous fiber 3D printing path design method based on a force flow pipe load path comprises the following steps:
s1, constructing a force flow tube load path generation model according to a finite element analysis result under the actual working condition of a part;
s2, dividing a part stress area according to the characteristics and distribution of the load path curve of the force flow tube;
s3, determining a printing path and materials required for printing according to the force flow pipe characteristics of each stress area and combining a main stress track line;
s4, carrying out manufacturing-oriented path optimization by combining the extrusion printing process with the printing path obtained in the step S3.
Further, the step S1 specifically includes the following steps:
s11, establishing a two-dimensional plane geometry corresponding to the part, setting a force application point load direction and a constraint boundary of the part, and obtaining a stress distribution state through finite element analysis;
s12, calculating the direction of the force flow tube of each node, and drawing a force flow tube visual graph.
Further, after finite element analysis in the step S11, a node coordinate (x, y) and a normal stress σ corresponding to each point are obtained x And shear stress τ xy 。
Further, the step S12 specifically calculates the direction of the force flow tube of each node by the following formula:
tanθ＝τ xy /σ x 。
further, the part stress area divided in the step S2 includes a main pulling area, a shearing area, a closed loop area, a light load area and a stress concentration area.
Further, the main pulling area is used for bearing a pulling force from a right load application point to a left fixed constraint boundary, and the pulling force is basically coincident with a main pulling stress track line drawn based on the first main stress;
the lower part of the shear force area is a semi-elliptic area connected with the fixed constraint boundary, and the transition from tensile stress to shear stress to compressive stress exists in the internal stress;
the closed loop area comprises 4 partial small annular areas, and the closed loop area plays a role in bearing the transition from tensile stress to compressive stress around the hole;
the upper annular region of the light load region only contacts the free boundary;
in the stress concentration area, the dense part of the force flow pipe is consistent with the stress concentration area.
Further, the step S3 specifically includes the following steps:
s31, combining the main stress track line to further divide a printing design area;
s32, screening a continuous fiber path in a main pulling area according to the force flow pipe;
s33, drawing dense filling of a stress concentration area in the main pulling area;
s34, drawing an auxiliary track line in the main pulling area according to the shearing force;
s35, drawing a shear region orthogonal principal stress trajectory line and extending the shear region orthogonal principal stress trajectory line to a model contour;
s36, cutting down the light load area to obtain the final part design style.
Further, in step S32, the force flow tube from the loading point to the end of the constraint boundary is screened in the main pulling area to perform 3D printing of the continuous fiber material, which is responsible for bearing the main load from the applied load to the constraint boundary, and it is required to ensure that the fiber distances at the gathering place are not stacked, and meanwhile, other force flow tubes in the main pulling area and corresponding orthogonal main compressive stress traces are printed according to the thermoplastic matrix material.
Further, in the step S33, the matrix material is selected to be densely filled in the stress concentration area, wherein the fiber printing part is involved, and the remaining part is required to be densely filled to enhance the bonding effect between the fiber and the matrix material.
Further, the step S4 is specifically to replace the curve short rod with a linear long rod for each grid boundary under the single-layer path, which is beneficial to further mechanical simulation verification and generation of printing experiment codes on the premise of ensuring the restoration degree of the fiber path design scheme;
the matrix material is preferentially printed in the same layer in the printing sequence to provide a supporting adhesive wall for fiber printing, improving printing.
Compared with the prior art, the invention has the following advantages:
1. the invention applies a theoretical system of a force flow tube and a continuous fiber composite material to a 3D printing part, and continuous fibers playing a main tensile effect change the design and manufacturing modes of the part, thereby providing possibility for lightening the part and improving mechanical properties. According to the dividing principle of different areas, continuous fibers with excellent axial stretching characteristics are paved in the main stretching area according to the load path of the force flow pipe, the stress concentration position is densely filled with thermoplastic matrix materials, meanwhile, matrix material distribution of the light-load area and the shearing area is optimized, the integral strength and rigidity of the part can be finally improved, and the weight reduction of the part is realized on the premise of meeting the application geometric requirement.
2. According to the invention, the density of the fiber starting point at the stress concentration position is controlled by adjusting the continuous fiber printing process, and the dense filling can strengthen the bonding effect of the continuous fiber force flow tube, and can prevent the unexpected fracture of the part at the load position.
3. According to the design method disclosed by the invention, the continuous carbon fibers are arranged, so that the stress distribution of the structure can be effectively improved, the matrix material intersected with the continuous fibers is printed in the same layer preferentially, the combination effect of the fiber composite material and the matrix material can be enhanced, and according to the design path arrangement method disclosed by the invention, the structure can be enhanced, the calculation efficiency of the whole process is improved, and meanwhile, the space required by a storage medium of a code file is effectively optimized.
4. The traditional main load direction adopts a continuous fiber printed 'penetrating' force flow tube and a local load 'vortex' force flow tube structure as a shear bearing or light load area, is not suitable for being connected with a peripheral area to enhance the stability of the structure, and the invention adopts an orthogonal main stress track line as an auxiliary line, so that the printing stability of the local force flow tube can be effectively improved, and the whole slim structure of a part is fully optimized.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of an application process of an embodiment;
FIG. 3a is a schematic diagram of a working load constraint in an embodiment;
FIG. 3b is a schematic diagram of finite element simulation results in an embodiment;
FIG. 4a is a schematic diagram of a force flow tube load path area division in an embodiment;
FIG. 4b is a schematic diagram of the principal stress trace in an embodiment;
FIG. 5 is a schematic illustration of a continuous fiber print path design flow in an embodiment;
FIG. 6a is a schematic diagram of a curved bar before optimization of print path details in an embodiment;
fig. 6b is a schematic diagram of a straight long bar after optimization of print path details in an embodiment.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Examples
As shown in fig. 1, a continuous fiber 3D printing path design method based on a force flow tube load path includes the following steps:
s1, constructing a force flow tube load path generation model according to a finite element analysis result under the actual working condition of a part;
s2, dividing a part stress area according to the characteristics and distribution of the load path curve of the force flow tube;
s3, determining a printing path and materials required for printing according to the force flow pipe characteristics of each stress area and combining a main stress track line;
s4, carrying out manufacturing-oriented path optimization by combining the extrusion printing process with the printing path obtained in the step S3.
By applying the technical scheme, as shown in fig. 2, the embodiment mainly includes:
(1) The node coordinates (x, y) and the positive stress sigma of corresponding points are obtained by finite element analysis under the actual working condition of the part x And shear stress τ xy A force flow pipe load path generation model is constructed, and the generation flow is as follows:
1) Taking a belt Kong Fangban as an example, the embodiment establishes a two-dimensional plane geometry, sets the load direction and the constraint boundary of a force application point of a part as shown in fig. 3a, and performs finite element analysis to obtain a stress distribution state (as shown in fig. 3 b);
2) According to the formula tanθ=τ xy /σ x Calculating the direction of force flow pipe of each node
Drawing a force flow tube visual graph;
(2) According to the characteristics and distribution of the load path curve of the force flow pipe, the stress area of the part is defined as shown in fig. 4a, and is divided into a main pulling area, a shearing area, a closed loop area, a light load area and a stress concentration area, wherein the characteristics of the areas are as follows:
1) Main pulling area: the tensile force mainly borne from the right load application point to the left fixed constraint boundary is basically coincident with a main tensile stress track line drawn based on the first main stress;
2) Shear area: a semi-elliptical area with the lower part connected with the fixed constraint boundary, wherein the internal stress has transition from tensile stress to shear stress to compressive stress;
3) Closed loop region: the 4 partial small annular areas are similar to shear areas and play a role in bearing the transition from tensile stress to compressive stress around the hole;
4) Light load region: the upper annular region only contacts the free boundary, and it can be observed from the stress map that the stress values in this region are low;
5) Stress concentration area: the dense portion of the force flow tube has a substantial degree of consistency with the region of stress concentration, such as the point of load application, the perimeter of the hole, and the upper left boundary.
(3) According to the force flow pipe characteristics of each region, the main pulling/compressive stress track line of fig. 4b is compared, the design rule of the set path and the required materials for printing are analyzed to realize the improvement of the mechanical property of the part and the efficient utilization of the materials, the main planning process is shown in fig. 5, and the specific flow is as follows:
1) Screening force flow pipes from loading points to the end of a constraint boundary in a main pulling area to perform continuous fiber material 3D printing, and taking charge of bearing main load from load application to the constraint boundary, wherein the fiber spacing at a gathering place is required to be ensured not to be stacked, and simultaneously, printing other force flow pipes in the main pulling area and corresponding orthogonal main compressive stress track lines according to thermoplastic matrix materials;
2) The stress concentration area needs to be densely filled with a matrix material, wherein the part (such as a load application point area) related to fiber printing needs to be densely filled with the rest part so as to enhance the bonding effect of the fiber and the matrix material;
3) The force flow pipe in the shearing area is equivalent to a part of the main tensile stress track line and a part of the main compressive stress track line respectively, shearing force exists in the closed loop area, and planning of the orthogonal main stress track line can be carried out;
4) The light load area, although the main compressive stress traces are concentrated here, is less stressed and the associated part form free boundaries are generally free of retention requirements, and printing to remove this area is optional to reduce unnecessary material wastage.
(4) And (3) carrying out manufacturing-oriented path optimization on the initially planned printing path by combining an extrusion printing process. For each grid boundary under a single-layer path, as shown in fig. 6a and 6b, the curve short rod is replaced by a linear long rod, and further mechanical simulation verification and printing experiment code generation are facilitated on the premise of guaranteeing the restoration degree of the fiber path design scheme. In the printing sequence, the matrix material is printed preferentially in the same layer, so that a supporting adhesion wall can be provided for fiber printing, and the printing effect is improved.
In summary, the technical scheme designs the 3D printing path of the continuous fiber composite material based on the load path, can realize the integrated design of light weight and enhanced mechanical property of the structure, and improves the characteristics of specific strength, specific rigidity, fatigue resistance and the like. According to the technical scheme, continuous fibers with excellent axial stretching characteristics are paved in the main pulling area according to the load path of the force flow pipe according to the dividing principle of different areas, the stress concentration positions are densely filled with thermoplastic matrix materials, and meanwhile, the matrix material distribution of the light-load area and the shearing force area is optimized, so that the integral strength and rigidity of the part can be effectively improved, and the weight reduction of the part is realized on the premise of meeting the application geometric requirement.
Claims (10)
1. A continuous fiber 3D printing path design method based on a force flow tube load path, which is characterized by comprising the following steps:
s1, constructing a force flow tube load path generation model according to a finite element analysis result under the actual working condition of a part;
s2, dividing a part stress area according to the characteristics and distribution of the load path curve of the force flow tube;
s3, determining a printing path and materials required for printing according to the force flow pipe characteristics of each stress area and combining a main stress track line;
s4, carrying out manufacturing-oriented path optimization by combining the extrusion printing process with the printing path obtained in the step S3.
2. The method for designing a continuous fiber 3D printing path based on a force flow tube load path according to claim 1, wherein the step S1 specifically comprises the steps of:
s11, establishing a two-dimensional plane geometry corresponding to the part, setting a force application point load direction and a constraint boundary of the part, and obtaining a stress distribution state through finite element analysis;
s12, calculating the direction of the force flow tube of each node, and drawing a force flow tube visual graph.
3. The method for designing a continuous fiber 3D printing path based on a force flow tube load path according to claim 2, wherein in the step S11, after finite element analysis, a node coordinate (x, y) and a normal stress σ corresponding to each point are obtained x And shear stress τ xy 。
4. A method for designing a continuous fiber 3D printing path based on a force flow tube load path according to claim 3, wherein the step S12 is specifically to calculate the direction of each node force flow tube by the following formula:
tanθ＝τ xy /σ x 。
5. the method according to claim 1, wherein the part stress areas divided in the step S2 include a main pulling area, a shear area, a closed loop area, a light load area and a stress concentration area.
6. The method of claim 5, wherein the primary pulling zone is configured to carry a pulling force from a right load application point to a left fixed constraint boundary, and substantially coincides with a primary tensile stress trajectory drawn based on the first primary stress;
the lower part of the shear force area is a semi-elliptic area connected with the fixed constraint boundary, and the transition from tensile stress to shear stress to compressive stress exists in the internal stress;
the closed loop area comprises 4 partial small annular areas, and the closed loop area plays a role in bearing the transition from tensile stress to compressive stress around the hole;
the upper annular region of the light load region only contacts the free boundary;
in the stress concentration area, the dense part of the force flow pipe is consistent with the stress concentration area.
7. The method for designing a continuous fiber 3D printing path based on a force flow tube load path according to claim 6, wherein said step S3 comprises the steps of:
s31, combining the main stress track line to further divide a printing design area;
s32, screening a continuous fiber path in a main pulling area according to the force flow pipe;
s33, drawing dense filling of a stress concentration area in the main pulling area;
s34, drawing an auxiliary track line in the main pulling area according to the shearing force;
s35, drawing a shear region orthogonal principal stress trajectory line and extending the shear region orthogonal principal stress trajectory line to a model contour;
s36, cutting down the light load area to obtain the final part design style.
8. The method according to claim 7, wherein the step S32 is specifically to screen the force flow tube from the loading point to the end of the constraint boundary in the main pulling area to perform 3D printing of the continuous fiber material, and the force flow tube and the corresponding orthogonal main compressive stress trace line in the main pulling area are printed according to the thermoplastic matrix material while ensuring that the fiber spacing at the aggregation point is not stacked.
9. The method according to claim 7, wherein the step S33 is to select a matrix material to be densely packed in a stress concentration area, wherein the fiber printing part is to densely pack the remaining part to enhance the bonding effect between the fiber and the matrix material.
10. The continuous fiber 3D printing path design method based on the force flow pipe load path according to claim 1, wherein the step S4 is specifically to replace a curve short rod with a linear long rod for each grid boundary under a single-layer path, and is beneficial to further mechanical simulation verification and printing experiment code generation under the premise of ensuring the reduction degree of the fiber path design scheme;
the matrix material is preferentially printed in the same layer in the printing sequence to provide a supporting adhesive wall for fiber printing, improving printing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211730749.2A CN116118196A (en) | 2022-12-30 | 2022-12-30 | Continuous fiber 3D printing path design method based on force flow pipe load path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211730749.2A CN116118196A (en) | 2022-12-30 | 2022-12-30 | Continuous fiber 3D printing path design method based on force flow pipe load path |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116118196A true CN116118196A (en) | 2023-05-16 |
Family
ID=86293931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211730749.2A Pending CN116118196A (en) | 2022-12-30 | 2022-12-30 | Continuous fiber 3D printing path design method based on force flow pipe load path |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116118196A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117290914A (en) * | 2023-10-27 | 2023-12-26 | 湘潭大学 | Stud connecting steel-UHPC interface shearing bearing capacity calculation method considering interface friction effect |
-
2022
- 2022-12-30 CN CN202211730749.2A patent/CN116118196A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117290914A (en) * | 2023-10-27 | 2023-12-26 | 湘潭大学 | Stud connecting steel-UHPC interface shearing bearing capacity calculation method considering interface friction effect |
| CN117290914B (en) * | 2023-10-27 | 2024-03-29 | 湘潭大学 | Stud connecting steel-UHPC interface shearing bearing capacity calculation method considering interface friction effect |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020192756A1 (en) | Method for planning 3d printing path of continuous fiber reinforced composite material | |
| CN103366070B (en) | A kind of composite material beam method for designing that can be used for helicopter and Fixed Wing AirVehicle | |
| Peeters et al. | Effect of steering limit constraints on the performance of variable stiffness laminates | |
| CN107451309A (en) | A kind of method of Multi-Scale Calculation complex composite material structure fiber yarn | |
| CN107451308A (en) | A kind of complex composite material structure effective thermal expansion coefficient multiscale simulation method | |
| CN116118196A (en) | Continuous fiber 3D printing path design method based on force flow pipe load path | |
| CN109101692B (en) | Composite material laminated plate ultimate load calculation method based on maximum stress criterion | |
| CN105500867A (en) | Novel composite material sandwich plate connecting structure without metal connecting piece and design method thereof | |
| KR101200167B1 (en) | Analysis system and method for composite materials | |
| CN104077434A (en) | CAE (Computer Aided Engineering) analysis based product structure optimization method and system | |
| WO2022037305A1 (en) | Design method for optimization of ceramic matrix composite material laminated prefabricated member | |
| CN102514708A (en) | Integral composite material central wing box | |
| CN105447269A (en) | Non-structural mass trimming method for airplane in steady overload state | |
| CN110210085A (en) | Indent hexagon negative poisson's ratio lattice structure Parameterized Method for Finite Element method | |
| CN106557638A (en) | The method for building up of the two-way transition element grid model of welding mixing | |
| CN107357974A (en) | Inhomogeneous fibre strengthens composite distribution optimization design method | |
| CN103678763A (en) | Method for aeroelastic tailoring of composite wing and genetic/sensitivity-based hybrid optimization method of composite wing | |
| CN111898295A (en) | Finite element modeling method of variable-rigidity composite laminated plate | |
| CN108973250A (en) | A kind of fiber-reinforced resin honeycomb sandwich structure composite material and preparation method | |
| CN103085363A (en) | Novel composite material dot matrix structure for connecting rod piece and panel and preparation method for novel composite material dot matrix structure | |
| CN109063280B (en) | Calculation method for elastic modulus of needled C/C composite material | |
| CN105468826B (en) | The design method of composite material | |
| CN114031794A (en) | Variable-rigidity hybrid continuous fiber reinforced composite material based on 3D printing and preparation method | |
| CN110826284B (en) | Modeling and analyzing method for composite material laminated board of interweaved and laminated mixed laying layers | |
| CN112528537A (en) | Variable-stiffness composite material structure analysis method for compression stability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |