CN110472307B - Optical cement stripping simulation method for display system - Google Patents
Optical cement stripping simulation method for display system Download PDFInfo
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- CN110472307B CN110472307B CN201910686513.5A CN201910686513A CN110472307B CN 110472307 B CN110472307 B CN 110472307B CN 201910686513 A CN201910686513 A CN 201910686513A CN 110472307 B CN110472307 B CN 110472307B
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Abstract
The invention discloses a method for simulating stripping of optical cement of a display system, which comprises the following steps: establishing a finite element model of a display system; obtaining elastic modulus, poisson ratio and linear expansion coefficient through the mechanical physical property table of the optical cement and the components, loading the parameters into constitutive equations under grids of the corresponding components, and carrying out boundary fixation on the finite element model in preprocessing software according to the actual installation of a display system to complete and derive the finite element model in a format required by finite element analysis software; importing the finite element model of the last step into finite element analysis software, establishing an implicit static calculation analysis step, and opening a nonlinear switch; setting an initial temperature of the integral finite element model in an initial analysis step; and loading high-temperature or low-temperature load in the implicit static analysis step, and obtaining a result file through finite element calculation to obtain whether the optical cement with the thickness can be stripped at high and low temperatures under the structure. The technical scheme has the advantages of low cost, high efficiency and good effect.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method for simulating stripping of optical cement of a display system.
Background
In the prior display system, the backlight and the touch screen are connected by using an optical adhesive full-lamination method, but the adhesive strength of the optical adhesive is reduced at high and low temperatures, so that the optical adhesive is peeled off at an adhesive surface.
The traditional method lacks data support, has different overall structures, needs different optical adhesive thicknesses, is difficult to inherit from experience, and has long time consumption, high cost and possibility of failing to achieve the expected effect after two modifications from design to sample preparation and verification.
Disclosure of Invention
The embodiment of the invention aims to provide a display system optical adhesive stripping simulation method which has the advantages of low cost, high efficiency and good effect.
The embodiment of the invention provides a method for simulating stripping of optical cement of a display system, which comprises the following steps:
importing the established 3D model into finite element preprocessing software, and establishing a finite element model of a display system;
obtaining elastic modulus, poisson ratio and linear expansion coefficient through the mechanical physical property table of the optical cement and the components, loading the parameters into constitutive equations under grids of the corresponding components, and carrying out boundary fixation on the finite element model in preprocessing software according to the actual installation of a display system to complete and derive the finite element model in a format required by finite element analysis software;
importing the finite element model of the last step into finite element analysis software, establishing an implicit static calculation analysis step, and opening a nonlinear switch;
setting an initial temperature of the integral finite element model in an initial analysis step;
loading high-temperature or low-temperature load in the implicit static analysis step, obtaining a result file through finite element calculation,
then, the post-processing software is used for extracting the surface compressive stress and the shearing stress of the optical cement in the result file;
the negative value of the compressive stress is that the tensile stress is compared with the tensile strength of the glue, and the shearing stress is compared with the shearing strength of the glue, so that whether the optical glue with the thickness can be peeled off at high and low temperatures under the structure can be obtained, and if the tensile stress exceeds the tensile strength of the optical glue bonding or the shearing stress exceeds the shearing strength of the optical glue bonding, the optical glue can be peeled off in an experiment, and the design is needed again.
Optionally, the 3D model created by ProE is imported into a finite element pre-processing software, through which a finite element model of the display system is created.
Optionally, the optical cement is modeled by using three layers of first order hexahedral solid units, and the aspect ratio is controlled below 4, so as to accurately calculate the compressive stress and the shear stress.
Optionally, the plastic shell of the display system is modeled using a second order tetrahedral unit, and the collapse ratio is controlled to be above 0.15.
Optionally, the metal plate and the touch screen use shell units, and the Jacobian is controlled to be more than 0.6.
Optionally, a high temperature of 90 ℃ or a low temperature load of-40 ℃ is loaded in the implicit static analysis step.
Alternatively, the overall finite element model initial temperature is set at 25 ℃ at the initial analysis step.
Therefore, by applying the technical scheme of the embodiment, the simulation method is used for analyzing the stripping of the optical cement, and whether the stripping risk exists can be judged according to the simulation result.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flow chart of a stripping simulation method of a display system optical adhesive based on finite element software at high and low temperatures;
FIG. 2 is a 90℃simulation result provided by the present invention;
FIG. 3 is a simulation result at-40℃provided by the present invention;
FIG. 4 is a graph showing 1-4 point simulation result statistics of FIGS. 2 and 3;
fig. 5 is a graph showing the peeling phenomenon of the optical cement in a corresponding experiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
the embodiment provides a method for simulating stripping of display system optical cement at high and low temperatures based on finite element software, as shown in fig. 1:
importing the 3D model established by the ProE into finite element preprocessing software, and establishing a finite element model of a display system through the preprocessing software; the optical cement is modeled by using three layers of first-order hexahedral solid units, the aspect ratio is controlled to be below 4, the optical cement is used for accurately calculating the compressive stress and the shearing stress, the plastic shell is modeled by using a second-order tetrahedral unit, the collapse ratio is controlled to be above 0.15, the metal plate and the touch screen are modeled by using shell units, and the Jacobian ratio is controlled to be above 0.6, so that the influence of grid quality on the rigidity of the part is eliminated in an effort.
And obtaining elastic modulus, poisson ratio and linear expansion coefficient through mechanical physical property tables of the optical cement and other parts of the structure, loading the parameters into constitutive equations under grids of corresponding parts, and fixing boundaries of the finite element model according to actual installation of a display system in preprocessing software to complete and derive the finite element model in a format required by finite element analysis software.
The finite element model of the last step is imported into finite element analysis software, and a nonlinear switch is opened for establishing an implicit static (static) calculation analysis step.
The overall finite element model was given an initial temperature of 25 ℃ in the initial analysis step. Loading high temperature of 90 ℃ or low temperature load of minus 40 ℃ in the implicit static analysis step, obtaining a result file through finite element calculation, and extracting the surface compressive stress and the shearing stress of the optical cement in the result file by using post-processing software.
And the negative value of the compressive stress is the comparison of the tensile stress and the tensile strength of the glue and the comparison of the shearing stress and the shearing strength of the glue, so that the situation that whether the optical glue with the thickness is peeled off at high and low temperature under the structure can be obtained. If the tensile stress exceeds the tensile strength of the optical cement bond or the shear stress exceeds the shear strength of the optical cement bond, the optical cement is considered to be stripped in the experiment and needs to be redesigned, so that the new method of design, simulation, optimization, re-simulation and experiment is used to replace the old method of traditional design, sample preparation, experiment, optimization, sample reproduction and re-experiment, and the sample preparation capital cost and the whole research and development time cost are reduced.
The optical adhesive compressive stress and the shear stress are simulated at 90 ℃ in fig. 2 (a) and (b), the optical adhesive compressive stress and the shear stress are simulated at-40 ℃ in fig. 3 (a) and (b), and the maximum tensile stress is 0.02MPa at 90 ℃ as shown in fig. 4, which is higher than the tensile strength of the optical adhesive bonding at the moment of 0.0157MPa; the maximum shearing stress at the temperature of minus 40 ℃ is 0.025MPa, which is higher than the shearing strength of the optical adhesive bonding at the time of 0.02MPa; and the position is identical to the experimental phenomenon. Fig. 5 shows the peeling phenomenon of the optical cement at high and low temperatures in practical experiments. The failure predicted by the method is completely consistent with the experimental result.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (5)
1. The method for simulating the stripping of the optical cement of the display system is characterized by comprising the following steps of:
importing the established 3D model into finite element preprocessing software, and establishing a finite element model of a display system;
obtaining elastic modulus, poisson ratio and linear expansion coefficient through the mechanical physical property table of the optical cement and the components, loading the parameters into constitutive equations under grids of the corresponding components, and carrying out boundary fixation on the finite element model in preprocessing software according to the actual installation of a display system to complete and derive the finite element model in a format required by finite element analysis software;
importing the finite element model of the last step into finite element analysis software, establishing an implicit static calculation analysis step, and opening a nonlinear switch;
setting an initial temperature of the integral finite element model in an initial analysis step;
loading a high-temperature load at 90 ℃ or a low-temperature load at-40 ℃ in the implicit static analysis step, obtaining a result file through finite element calculation, and extracting the surface compressive stress and the shearing stress of the optical cement in the result file by using post-processing software;
the negative value of the compressive stress is that the tensile stress is compared with the tensile strength of the glue, and the shearing stress is compared with the shearing strength of the glue, so that whether the optical glue with the corresponding thickness is peeled off at high and low temperatures under the display system structure can be obtained, and if the tensile stress exceeds the tensile strength of the optical glue bonding or the shearing stress exceeds the shearing strength of the optical glue bonding, the optical glue is peeled off in an experiment and needs to be redesigned;
the optical cement is modeled by using three layers of first-order hexahedral solid units, and the aspect ratio is controlled below 4, so that the compressive stress and the shearing stress are accurately calculated.
2. The method for simulating stripping of optical cement of display system according to claim 1, wherein the 3D model established by ProE is imported into finite element preprocessing software, and the finite element model of the display system is established by the preprocessing software.
3. The method for simulating peeling of optical cement in a display system according to claim 1, wherein a plastic shell of the display system is modeled by using a second order tetrahedron unit, and a collapse ratio is controlled to be more than 0.15.
4. The method for simulating stripping of optical cement in a display system according to claim 3, wherein the metal plate and the touch screen are made of shell units, and the Jacobian is controlled to be more than 0.6.
5. The method of claim 4, wherein the initial temperature of the overall finite element model is set to 25 ℃.
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| CN109933927A (en) * | 2019-03-19 | 2019-06-25 | 华北水利水电大学 | A kind of foundation and force analysis method of information display window geometrical model |
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| JP2017083339A (en) * | 2015-10-29 | 2017-05-18 | 東レ株式会社 | Delamination progress simulation device |
| CN109408969B (en) * | 2018-10-28 | 2022-12-23 | 北京工业大学 | Method for identifying viscoelastic parameters of rubber by using finite element software to establish constitutive model |
| CN109766624A (en) * | 2019-01-04 | 2019-05-17 | 北京航空航天大学 | A kind of prediction technique of cementing structure adhesive layer fatigue life under the conditions of high/low temperature cold cycling |
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| JP2016065847A (en) * | 2014-09-22 | 2016-04-28 | 新日鐵住金株式会社 | Fracture prediction method of adhesion joint |
| CN109933927A (en) * | 2019-03-19 | 2019-06-25 | 华北水利水电大学 | A kind of foundation and force analysis method of information display window geometrical model |
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