CN113392556B - Flexible screen laminating method based on finite element model numerical simulation - Google Patents
Flexible screen laminating method based on finite element model numerical simulation Download PDFInfo
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- CN113392556B CN113392556B CN202110665077.0A CN202110665077A CN113392556B CN 113392556 B CN113392556 B CN 113392556B CN 202110665077 A CN202110665077 A CN 202110665077A CN 113392556 B CN113392556 B CN 113392556B
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention provides a flexible screen laminating method based on finite element model numerical simulation, which comprises the following steps of: s1: establishing a laminating simulation model, wherein the laminating simulation model comprises a laminating platform Stage, a material to be laminated, a roller Drum and a roller outer ring Sheet arranged around the roller Drum, and the laminating platform Stage and the roller Drum are set as discrete rigid bodies and are endowed with material attributes; setting a material to be attached and an outer ring Sheet as a flexible deformable body, and endowing material properties with the flexible deformable body; s2: setting a contact mode for the fitting simulation model, and adding constraints and loads; s3: meshing the fit simulation model; s4: and setting different boundary conditions and material parameters, then carrying out simulation solution, and comparing simulation results under different boundary conditions. The invention provides reference ranges for selection of actual processing materials, time required by bonding, application of load and the like, thereby guiding production and improving working efficiency.
Description
Technical Field
The invention relates to the technical field of finite element analysis, in particular to a flexible screen laminating method based on numerical simulation of a finite element model.
Background
With the popularization of display terminals, the requirements of people on display equipment are more and more strict, and the display equipment is required to be compact in structure and convenient to carry; it is also desirable to provide a larger display size for entertainment. The screen size of the traditional display equipment is inevitably reduced and the entertainment experience is worsened if the traditional display equipment is mutually restricted and is convenient to carry; if a larger display screen is provided, the size of the display screen is inevitably larger, and the display screen is not easy to carry. The presence of a flexible screen provides a possibility for solving the above-mentioned problems. However, the flexible screen has problems of crease, bending damage, glue layer peeling and the like. The polymer high molecular material adopted by the flexible screen comprises complex mechanical behaviors such as elasticity, viscoelasticity, superelasticity and other different mechanical properties, the stress and deformation conditions in the fitting process are difficult to calculate and solve by simply adopting traditional theoretical analysis, the test method is high in cost and needs to spend long test time, only the mechanical states at the initial moment and the final moment can be obtained, the middle deformation process cannot be accurately known, and research personnel cannot be helped to fundamentally recognize the problem. And, flexible module structure is at the in-process that warp, and the mutual restriction between the different devices, and the atress condition is very different when buckling with monomer device. If only the single device is analyzed, the real stress condition of the module cannot be accurately reflected.
Disclosure of Invention
In order to solve the defects, the invention provides a flexible screen laminating method based on finite element model numerical simulation, which can realize the state of a flexible screen in the whole laminating motion simulation process, ensure the laminating simulation precision of the flexible screen, reduce the simulation time and the calculation consumption, and provide reference ranges for the selection of materials to be actually laminated, the time required by laminating, the application of loads and the like, thereby guiding the production and improving the working efficiency.
The invention provides a flexible screen laminating method based on finite element model numerical simulation, which comprises the following steps: s1: establishing a laminating simulation model, wherein the laminating simulation model comprises a laminating platform Stage, a material to be laminated, a roller Drum and a roller outer ring Sheet arranged around the roller Drum, and the laminating platform Stage and the roller Drum are set as discrete rigid bodies and are endowed with material attributes; setting a material to be attached and a roller outer ring Sheet as a flexible deformable body, and endowing the material with properties; s2: setting a contact mode for the fitting simulation model, and adding constraints and loads; s3: meshing the fit simulation model; s4: and setting different boundary conditions and material parameters, then carrying out simulation solving, and comparing simulation results under different boundary conditions.
In one embodiment of the present invention, in step S1, the material to be bonded includes any one or more of SUS (support film), SCF (heat dissipation film), Panel (liquid crystal glass), OCA optical cement, POL (polarizer), and Cover Flim (protective film).
In one embodiment of the present invention, in step S2, the contact mode is a frictionless contact mode and the tangential behavior is a penalty function mode.
In one embodiment of the present invention, in step S2, the roller outer sleeve Sheet and the roller Drum adopt binding constraint.
In one embodiment of the present invention, in step S2, the constraint of coupling is adopted between the roller outer ring sheet and the material to be bonded, and between the two materials to be bonded.
In an embodiment of the present invention, in step S3, the material to be bonded is configured as a double-layer grid, the grid size is 2, the grid type is C3D8R, the hourglass control manner is adopted as the combination manner, and the stiffness-viscosity weight factor is 0.8.
In one embodiment of the present invention, in step S3, the Sheet is set as a single-layer mesh, the mesh size is 2, the mesh type is C3D8R, the hourglass control manner is adopted as the combination manner, and the stiffness-viscosity weight factor is 0.8.
In one embodiment of the present invention, in step S4, the simulation process includes the following steps: (1) the laminating platform Stage conveys a first material to be laminated, a roller Drum presses the first material to be laminated downwards, and the roller Drum rotates to enable the first material to be laminated to be adhered to the outer surface of a Sheet on an outer ring of the roller; (2) the laminating platform Stage conveys a second material to be laminated, a roller Drum presses the second material to be laminated downwards, and the roller Drum rotates to enable the second material to be laminated on the outer surface of the first material to be laminated; (3) and (3) realizing the fitting simulation of other materials to be fitted by adopting the step (2).
In one embodiment of the present invention, in step S4, the load, the pressing amount, and the rotation speed of the roller Drum are adjusted to perform a plurality of simulation simulations, and the most suitable range of the load, the pressing amount, and the rotation speed of the roller Drum is selected according to the simulation results.
In summary, the invention provides a flexible screen attaching method based on finite element model numerical simulation, and the method has the following beneficial effects:
the invention has reliable display on the whole flexible screen fitting dynamic change process, and can visually present the result which is difficult to observe and measure, thereby helping people understand and research. Through simulation analysis, effective guidance can be provided for formulation of an experimental scheme, selection of an observation point and determination of an observation range. Therefore, the invention not only can save the cost and reduce the experimental expense, but also can provide theoretical research, reliably guide the experiment and generate long-term effective benefit. The invention establishes a reasonable and effective simulation model, and has very important significance for solving the problems of bending damage, glue layer peeling and the like in the development of the current flexible screen.
Furthermore, a three-dimensional structure model for fitting simulation is established based on ABAQUS, then a material to be fitted in the three-dimensional structure model is divided into double-layer hexahedron meshes, and a roller Drum, a roller outer ring Sheet and a base Stage are fitted in the three-dimensional structure model to divide a single-layer hexahedron mesh; and (3) endowing materials and attributes to the materials to be attached and the roller outer ring Sheet, setting a friction mode comprising frictionless CONTACT and a penalty function in a CONTACT mode, and simulating the attribute of the OCA optical cement in practice by using COHESIVE-CONTACT so as to obtain a finite element simulation model for attaching the flexible screen. The invention provides the motion constraint relation and physical characteristics among the poses of each part, and performs kinematics and dynamics analysis and calculation; the flexible screen is attached to obtain a dynamic finite element simulation result, so that the stress and strain can be monitored in real time conveniently. The method can realize the state of the flexible screen in the whole laminating motion simulation process, can ensure the laminating simulation precision of the flexible screen, and reduces the simulation time and the calculation consumption. Through multiple times of simulation, the most suitable performance parameters of the material to be bonded, the load of the roller Drum, the pressing amount and the range of the rotating speed are selected, certain reference is provided for the selection of the actual processing material, the time required by bonding, the application of the load and the like, so that the production is guided, and the equipment debugging time is shortened.
Drawings
FIG. 1 is a schematic flow chart of a flexible screen laminating method for finite element model numerical simulation according to the present invention.
Fig. 2 is an assembly view of a flexible screen attachment model in numerical simulation of the finite element model in example 1.
FIG. 3 is an assembly view of the model after setting reference points in steps 6 to 9 in example 1.
Fig. 4 is a model assembly diagram after meshing in steps 10-12 of example 1.
To illustrate the element symbols:
1. laminating a platform Stage; 2. a roller wheel Drum; 3. a roller outer ring Sheet; 4. panel; 5. SUS; 6. XRP (X-ray fluorescence); 7. XRP-1; 8. XRP-2; 9. XRP-3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the present invention provides a flexible screen attaching method based on finite element model numerical simulation, which comprises the following steps:
s1: and establishing a fitting simulation model.
The laminating simulation model comprises a laminating platform Stage, a material to be laminated, a roller Drum and a roller outer ring Sheet arranged around the roller Drum, wherein the laminating platform Stage and the roller Drum are set as discrete rigid bodies, and the material attributes are given; and setting the material to be attached and the roller outer ring Sheet as a flexible deformable body, and giving material properties.
In step S1, the material to be bonded includes any one or more of SUS, SCF, Panel, OCA optical cement, POL, and Cover Flim.
S2: and setting a contact mode for the fitting simulation model, and adding constraints and loads.
In step S2, the contact mode is a frictionless contact mode and the tangential behavior is a penalty function mode.
In step S2, the roller outer ring Sheet and the roller Drum are bound, and the roller outer ring Sheet and the material to be bonded and the two materials to be bonded are bound by coupling.
S3: and carrying out mesh division on the fit simulation model.
In step S3, the material to be bonded is set to be a double-layer mesh, the mesh size is 2, the mesh type is C3D8R, the hourglass control manner is adopted as the combination manner, and the stiffness-viscosity weight factor is 0.8.
In step S3, the roller outer ring Sheet is set as a single-layer mesh, the size of the mesh is 2, the mesh type is C3D8R, the hourglass control mode is adopted as the combination mode, and the stiffness viscosity weight factor is 0.8.
S4: and setting different boundary conditions and material parameters, then carrying out simulation solving, and comparing simulation results under different boundary conditions.
In step S4, the process of the simulation includes the following steps: (1) the laminating platform Stage conveys a first material to be laminated, a roller Drum presses the first material to be laminated downwards, and the roller Drum rotates to enable the first material to be laminated to be adhered to the outer surface of a Sheet on an outer ring of the roller; (2) the laminating platform Stage conveys a second material to be laminated, a roller Drum presses the second material to be laminated downwards, and the roller Drum rotates to enable the second material to be laminated on the outer surface of the first material to be laminated; (3) and (3) adopting the step (2) to realize the jointing of other materials to be jointed.
In step S4, the load, the pressing amount, and the rotation speed of the roller Drum need to be adjusted to perform simulation for a plurality of times, and the most suitable range of the load, the pressing amount, and the rotation speed of the roller Drum is selected according to the simulation result.
This is further illustrated by the various examples below.
Example 1
A flexible screen fitting method based on finite element model numerical simulation comprises the following steps:
And 2, designating the laminating platform Stage and the roller Drum as discrete rigid bodies, and designating the Panel, SUS and the roller outer ring Sheet as deformable flexible bodies. And assigned material properties and dimensions, respectively.
Step 4, the contact setting comprises: the friction-free mode and the tangential behavior adopt a penalty function mode, and the friction coefficient is taken as 0.3.
Step 5, binding constraint: the inner surface of the roller outer ring Sheet is bound with the outer surface of the roller Drum.
Step 8, constraint of coupling: for SUS a reference point XRP-3 is defined, and Sus is controlled by the reference point and the chosen surface.
And step 10, selecting Panel as a double-layer grid, wherein the size of the grid is 2, the type of the grid is C3D8R, and the rigidity and viscosity weight factor is 0.8 by adopting an hourglass control mode as a combination mode.
And step 11, selecting SUS as a double-layer grid, wherein the size of the grid is 2, the type of the grid is C3D8R, and the rigidity and viscosity weight factor is 0.8 by adopting a sandglass control mode as a combination mode.
And step 12, selecting a roller outer ring Sheet single-layer grid, wherein the size of the grid is 2, the type of the grid is C3D8R, and the rigidity viscosity weight factor is 0.8 by adopting a sandglass control mode as a combination mode.
And step 13, pressing down the roller Drum.
And step 14, rotating the roller Drum and the roller outer ring Sheet to drive Panel to be attached to the roller outer ring Sheet.
And step 15, lifting the roller Drum and the roller outer ring Sheet upwards.
And step 16, rotating the roller Drum and the roller outer ring Sheet to prepare for the second SUS fitting.
Step 17, the roller Drum presses down.
And step 18, rotating the roller Drum and the roller outer ring Sheet to drive SUS to be attached to Panel.
Step 19, if the multi-layer lamination is required, steps 13-18 can be repeated.
And 20, adjusting the load, the pressing amount and the rotating speed of the roller Drum to perform multiple times of simulation, and selecting the most appropriate range of the load, the pressing amount and the rotating speed of the roller Drum in each bonding process according to the simulation result for guiding the bonding production.
Example 2
A flexible screen fitting method based on finite element model numerical simulation comprises the following steps:
And 2, designating the laminating platform Stage and the roller Drum as discrete rigid bodies, and designating the Panel, SUS, roller outer ring Sheet and OCA optical cement as deformable flexible bodies, and designating the material properties and the sizes of the flexible bodies respectively.
Step 4, the contact setting comprises: the friction-free mode and the tangential behavior adopt a penalty function mode, and the friction coefficient is taken as 0.3.
Step 5, binding constraint: the inner surface of the roller outer ring Sheet is bound with the outer surface of the roller Drum.
Step 8, constraint of coupling: for SUS, a reference point XRP-3 is defined, and SUS is controlled by the reference point and the selected surface.
Step 10, constraint of coupling: a reference point XRP is defined for the Stage, which is controlled by the reference point and the selected surface.
And 11, selecting Panel as a double-layer grid, wherein the size of the grid is 2, the type of the grid is C3D8R, and the rigidity and viscosity weight factor is 0.8 by adopting an hourglass control mode as a combination mode.
And step 12, selecting SUS as a double-layer grid, wherein the size of the grid is 2, the type of the grid is C3D8R, and the rigidity and viscosity weight factor is 0.8 by adopting an hourglass control mode as a combination mode.
And step 13, selecting the OCA optical cement as a double-layer grid, wherein the size of the grid is 2, the type of the grid is C3D8R, and the rigidity and viscosity weight factor is 0.8 by taking an hourglass control mode as a combination mode.
And 14, selecting a roller outer ring Sheet single-layer grid, wherein the size of the grid is 2, the type of the grid is C3D8R, and the rigidity viscosity weight factor is 0.8 by adopting a hourglass control mode as a combination mode.
Step 15, the roller wheel Drum presses down.
And step 16, rotating the roller Drum and the roller outer ring Sheet to drive Panel to be attached to the roller outer ring Sheet.
And step 17, lifting the roller Drum and the roller outer ring Sheet upwards.
And step 18, rotating the roller Drum and the roller outer ring Sheet to prepare for the second SUS fitting.
In step 19, the roller Drum presses down.
And step 20, rotating the roller Drum and the roller outer ring Sheet to drive SUS to be attached to Panel.
And step 21, lifting the roller Drum and the roller outer ring Sheet upwards.
And step 22, rotating the roller Drum and the roller outer ring Sheet to prepare for attaching the OCA optical cement for the third time.
In step 23, the roller wheel Drum presses down.
And 24, rotating the roller Drum and the roller outer ring Sheet to drive the OCA optical cement to be attached to SUS.
And 25, repeating the steps 15-24 if the bonding is to be continued.
And 26, adjusting the load, the pressing amount and the rotating speed of the roller Drum to perform multiple times of simulation, and selecting the most appropriate range of the load, the pressing amount and the rotating speed of the roller Drum in each bonding process according to the simulation result for guiding the bonding production.
The flexible screen lamination based on finite element model numerical simulation is performed under the software ABAQUS of Daco. The method for processing the flexible screen is a novel processing technology. Those skilled in the art will appreciate from simulation modeling to practical application that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A flexible screen laminating method based on finite element model numerical simulation is characterized by comprising the following steps:
s1: establishing a laminating simulation model, wherein the laminating simulation model comprises a laminating platform Stage, a material to be laminated, a roller Drum and a roller outer ring Sheet arranged around the roller Drum, and the laminating platform Stage and the roller Drum are set as discrete rigid bodies and are endowed with material attributes; setting a material to be attached and a roller outer ring Sheet as a flexible deformable body, and endowing the material with properties;
s2: setting a contact mode for the fitting simulation model, and adding constraints and loads;
s3: meshing the fit simulation model;
s4: setting different boundary conditions and material parameters, then carrying out simulation solving, and comparing simulation results under different boundary conditions;
in step S4, the process of the simulation includes the following steps:
(1) the laminating platform Stage conveys a first material to be laminated, a roller Drum presses the first material to be laminated downwards, and the roller Drum rotates to enable the first material to be laminated to be adhered to the outer surface of a Sheet on an outer ring of the roller;
(2) the laminating platform Stage conveys a second material to be laminated, a roller Drum presses the second material to be laminated downwards, and the roller Drum rotates to enable the second material to be laminated on the outer surface of the first material to be laminated;
(3) the step (2) is adopted to realize the fitting simulation of other materials to be fitted;
in step S4, the load, the pressing amount, and the rotation speed of the roller Drum need to be adjusted to perform simulation for a plurality of times, and the most suitable range of the load, the pressing amount, and the rotation speed of the roller Drum is selected according to the simulation result.
2. The flexible screen attaching method based on finite element model numerical simulation of claim 1, wherein in step S1, the material to be attached comprises any one or more of SUS, SCF, Panel, OCA optical cement, POL and Cover Flim.
3. The flexible screen attaching method based on the finite element model numerical simulation of claim 1, wherein in step S2, the contact mode adopts a friction-free contact mode and the tangential behavior adopts a penalty function mode.
4. The flexible screen attaching method based on finite element model numerical simulation of claim 1, wherein in step S2, the roller outer ring Sheet and the roller Drum adopt binding constraint.
5. The flexible screen attaching method based on finite element model numerical simulation of claim 1, wherein in step S2, coupling constraints are adopted between the roller outer ring Sheet and the material to be attached and between the two materials to be attached.
6. The flexible screen attaching method based on finite element model numerical simulation of claim 1, wherein in step S3, the material to be attached is configured as a double-layer mesh, the mesh size is 2, the mesh type is C3D8R, the hourglass control mode is adopted as the combination mode, and the stiffness-viscosity weight factor is 0.8.
7. The flexible screen laminating method based on finite element model numerical simulation of claim 1, wherein in step S3, the roller outer ring Sheet is set as a single-layer mesh, the mesh size is 2, the mesh type is C3D8R, the hourglass control mode is adopted as the combination mode, and the stiffness-viscosity weight factor is 0.8.
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| CN112639309A (en) * | 2018-12-18 | 2021-04-09 | 深圳市柔宇科技股份有限公司 | Damping piece, hinge device and electronic device |
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| CN103942378A (en) * | 2014-04-11 | 2014-07-23 | 北京工业大学 | Design and adjusting method for heavy numerical control machine tool foundation vibration isolation ditch based on single side vibration source |
| CN112639309A (en) * | 2018-12-18 | 2021-04-09 | 深圳市柔宇科技股份有限公司 | Damping piece, hinge device and electronic device |
| CN110148358A (en) * | 2019-06-28 | 2019-08-20 | 京东方科技集团股份有限公司 | The joint tool of flexible screen and the applying method of flexible screen |
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