CN114537058B - Tire carcass cord stress analysis method after tire pinning, design method, equipment and program product - Google Patents
Tire carcass cord stress analysis method after tire pinning, design method, equipment and program product Download PDFInfo
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- CN114537058B CN114537058B CN202210092356.7A CN202210092356A CN114537058B CN 114537058 B CN114537058 B CN 114537058B CN 202210092356 A CN202210092356 A CN 202210092356A CN 114537058 B CN114537058 B CN 114537058B
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- 238000004458 analytical method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004364 calculation method Methods 0.000 claims abstract description 18
- 238000004088 simulation Methods 0.000 claims abstract description 7
- 238000004590 computer program Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C99/00—Subject matter not provided for in other groups of this subclass
- B60C99/006—Computer aided tyre design or simulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to the technical field of intelligent design of tires, in particular to a tire carcass cord stress analysis method, design method, equipment and program product after tire pinning. The invention provides a method for analyzing the stress of a tire body cord after radial tire pinning, which can rapidly and accurately analyze the stress of the tire body cord after pinning on the basis of not changing a calculation model by using a dead unit method of simulation analysis and provides a basis for tire design.
Description
Technical Field
The invention relates to the technical field of intelligent design of tires, in particular to a tire carcass cord stress analysis method, design method, equipment and program product after tire pinning.
Background
Tires are the only components of the vehicle that contact the ground, and the tires are inevitably subject to puncture, such as pinning, by sharp, hard objects while the vehicle is traveling. For radial tires for passenger cars, the carcass materials generally include a steel belt, a polyester cord carcass and a nylon cap ply, wherein the steel belt and the carcass cord are the main bearing components, the belt steel wire is difficult to cut when being pinned, and the carcass polyester cord is extremely easy to break. Because the single or a plurality of carcass cords are broken, the cord bearing force near the broken cords is increased than that before pinning, when the cord bearing force exceeds the breaking limit, the broken cords are broken in a pulling way, and then linkage breakage is caused, so that the large-area carcass cords are broken, when the number of broken cords is increased to a certain degree, the tire can be quickly leaked or instantaneously exploded, and vehicle safety accidents are caused.
The diameter or the maximum cross-section size of a sharp object capable of puncturing the tire is about 1mm to 6mm, so that when the tire is designed, the tire is guaranteed not to be subjected to chain breakage when the tire is pinned by a certain area, for example, when the tire is matched with a vehicle, a general host factory requires that the tire cannot be subjected to rapid air leakage or explosion after being pinned by 5mm, the safety factor of a carcass cord is kept above a certain value, an accurate value of stress of a nearby cord after a certain number of carcass cords are broken is required to be obtained, and the line density of the carcass cord when the tire is designed or the rationality of the design of an evaluation scheme is determined according to the value.
Because the tire body cord is embedded in rubber in the finished tire, the stress of the tire body cord cannot be directly measured through experiments, if the coating of the tire body cord is removed, and then the tire body cord is measured by attaching a strain gauge to the tire body cord, the original structure of the tire is destroyed, and the stress of the tire body cord is changed and is not consistent with the actual situation. The finite element simulation method can accurately analyze the tire carcass stress, but if a nail is directly simulated to be pricked into a tire, the grid is caused to deform greatly, so that calculation is not converged, and a calculation result cannot be obtained. Therefore, the invention provides a method for analyzing the tire cord stress of the tire after the radial tire is pinned, and by utilizing a dead unit method of simulation analysis, the tire cord stress after the pinning can be rapidly and accurately analyzed on the basis of not changing a calculation model, thereby providing a basis for the tire design.
Disclosure of Invention
The present invention aims to solve the problems of the prior art, that is, the diameter or the maximum cross-section size of a common nail or a sharp object capable of puncturing a tire is about 1 mm-6 mm, so that when the tire is designed, the tire is not subjected to chain breakage when the tire is pinned with a certain area, for example, when the tire is matched with a vehicle, a common host factory requires that the tire cannot be subjected to rapid air leakage or explosion after being pinned with 5mm, the safety factor of a carcass cord is kept above a certain value, the accurate value of the stress of nearby cords after a certain number of carcass cords are broken is required to be obtained, and the linear density of the carcass cord when the tire is designed or the rationality of the design of an evaluation scheme is determined according to the value. Because the tire body cord is embedded in rubber in the finished tire, the stress of the tire body cord cannot be directly measured through experiments, if the coating of the tire body cord is removed, and then the tire body cord is measured by attaching a strain gauge to the tire body cord, the original structure of the tire is destroyed, and the stress of the tire body cord is changed and is not consistent with the actual situation. The finite element simulation method can accurately analyze the tire carcass stress, but if a nail is directly simulated to be pricked into a tire, the grid is caused to deform greatly, so that calculation is not converged, and a calculation result cannot be obtained. And then provides a tire body cord stress analysis method after radial tire pinning, which can rapidly and accurately analyze tire body cord stress after pinning on the basis of not changing a calculation model and provides a basis for tire design.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for analyzing the stress of a carcass cord after tire pinning, the method comprising the steps of:
first, the tire material distribution diagram is meshed, and the analysis pinning position and the tire cord breaking length L are determined c And width L d Based on the analyzed pinning location and cord break width L d Encrypting the grid at the corresponding position of the matrix, and pinning the two-dimensional grid size L of the position w Less than or equal to L d Performing two-dimensional axisymmetric inflation analysis;
secondly, on the basis of inflation analysis, the two-dimensional axisymmetric model is rotated for one circle, and the fracture length L of the pinning cord is analyzed c Encrypting a circumferential grid at the grounding center part of the tire to ensure that L c ＝n*L k N is 1 or more, wherein L k Is the circumferential length L of the carcass grid at the grounding central part of the tire w The calculation method of (1) is as follows: l (L) k ＝θ*r c ；
Wherein θ is the radian value of the angle occupied by the grid at the grounding center part, r c The radius of the tire body cord at the center of the tire crown;
thirdly, performing inflation analysis and load analysis on the three-dimensional model;
fourth, according to the node and unit information of the inflated three-dimensional model, finding the unit number of the tire body cord at the grounding center part, and according to the analyzed breaking width L of the tire body cord c And the circumferential length L of the carcass grid at the grounding central part of the tire k The relation n between the two is used for determining the number m of the units to be selected, m=n, and the number m of the units to be selected is determined according to the breaking width L d And a two-dimensional grid size L w Determining the carcass cord unit number for which the ground contact center portion is to be specially designed;
fifthly, setting the attribute of the unit selected in the third step as dead in the three-dimensional simulation analysis input model of the tire in the second step by utilizing a dead unit technology of simulation software, namely the unit does not participate in calculation, and the unit is invalid;
sixthly, performing inflation analysis on the completed model set in the fifth step;
seventh, carrying out load analysis of a specified load on the analysis model on the analysis result of the sixth step;
eighth step, extracting a stress maximum M in the carcass cord direction in a unit in the vicinity of the unit where the attribute is set to be dead s ；
Ninth, calculating the stress F of the carcass cord with the largest stress according to the cross-sectional area A of the single carcass cord: f=a×m s ；
Ninth, the F calculated in the eighth step is combined with the measured value F of the breaking strength of the carcass cord d Comparing, and calculating a safety factor p by the safety factor: p=f d /F；
The maximum stress and the safety multiple of the tire body cord after the tire is pinned can be obtained through the calculation process.
Preferably, the tire is a radial tire.
The invention further discloses a tire design method, the method adopts the tire post-pinning tire body cord stress analysis method to obtain the post-pinning safety multiple, when the post-pinning safety multiple is calculated to be lower than the required safety multiple, the tire body cord needs to be encrypted, and when the post-pinning safety multiple is calculated to be far lower than the required safety multiple, the tire body cord distance can be properly increased.
Preferably, the tire is a radial tire.
Further, the invention also discloses a computer device, comprising a memory, a processor and a computer program stored on the memory, wherein the processor executes the computer program to realize the method.
Further, the invention also discloses a computer readable storage medium, on which a computer program or instructions is stored, characterized in that the computer program or instructions, when executed by a processor, implement the method.
Further, the invention also discloses a computer program product comprising a computer program or instructions which, when executed by a processor, implements the method.
By adopting the technical scheme, the invention can rapidly and accurately analyze the stress of the tire body cord after pinning on the basis of not changing a calculation model, and provides a basis for the design of tires.
Drawings
FIG. 1 is a cross-sectional grid view of a tire and cell length L w Schematic diagram.
FIG. 2 is a cross-sectional view of a tire after two-dimensional axisymmetric inflation.
FIG. 3 is r c And a theta schematic diagram.
Fig. 4 is a load deflection diagram of a unbuckled Kong Luntai carcass.
Fig. 5 is an inflated view of a carcass with a tie Kong Luntai.
Fig. 6 is a carcass load diagram with bundle Kong Luntai.
Fig. 7 is a graph showing the maximum tensile stress value and position of the carcass unit in the vicinity of a puncture having a width of 2.6 mm.
Fig. 8 is a graph showing the maximum tensile stress value and position of the carcass unit in the vicinity of a puncture having a width of 5.2 mm.
Fig. 9 is a graph showing the maximum tensile stress values and positions of a puncture-free tire carcass unit.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of protection of the present invention is not limited to the following embodiments.
Taking 21550R15 tires as an example:
first, the tire material distribution pattern was gridded (as in FIG. 1), and the analyzed pinning cord break widths were 2.6mm, 5.2mm (i.e., L d =2.5 mm or 5.2 mm), length L c 8mm, the grid is encrypted at the central part of the carcass (as in fig. 1), the two-dimensional grid size of the central part of the carcass (as identified in fig. 1) L w =2.6mm less than or equal to L d Two-dimensional axisymmetric inflation analysis was performed with an air pressure of 0.18MPa, and the results are shown in FIG. 2;
second, based on the inflation analysis, the two-dimensional axisymmetric model is rotated one round, and the tire is manufactured according to the analyzed breaking width (L c =8mm) encrypts the circumferential mesh at the tire ground contact center portion to let L c ＝n*L k (n is 1 or more), in this example n=1, i.e. L k =8mm, where L k Is the circumferential length L of the carcass grid at the grounding central part of the tire k The calculation method of (1) is as follows:
L k ＝θ×r c ＝303mm×0.0264＝8mm
wherein θ is radian (0.0264 radian) occupied by the grid at the grounding center part, r c The radius of the carcass cord at the center of the crown (303 mm) is shown in fig. 3.
The three-dimensional model was subjected to load analysis with a load of 6027N, and the result is shown in fig. 4.
Third, according to the node and unit information of the inflated three-dimensional model, finding out the unit numbers 103615 and 103616 of the carcass cord at the grounding center part, and according to the analyzed breaking width L of the carcass cord c And the circumferential width L of the carcass grid at the grounding center of the tire k The relation n between the two, in this example n=1, the number of units to be selected m, m=n=1, is determined according to the breaking width L d And a two-dimensional grid size L w When the analysis breaking width is 2.6mm, the ground center portion is to beCarcass cord unit numbers 103615 for special design, and carcass cord unit numbers 103615 and 103616 for special design in the ground center portion when the analysis breaking width is 5.2 mm;
fourth, using the dead unit technology of Abaqus simulation software, in the second step, setting the attribute of the unit selected in the third step as dead in the three-dimensional simulation analysis input model of the tire, namely, the unit does not participate in calculation, the unit is invalid, specifically, the first row of the command line is added: model Change, type=element, remove, second line: 103615 103616;
fifth, the air inflation analysis is carried out on the completed model set in the fourth step, the air pressure is 0.18MPa, and the result is shown in fig. 5;
sixth, on the analysis result of the fifth step, carrying out load analysis of a specified load on the analysis model, wherein the load is 6027N, and the result is shown in fig. 6;
seventh, the maximum value M of stress in the carcass cord direction in the cells in the vicinity of the cells set to be dead (i.e., ineffective cells, in this example, cells numbered 103615 and 103616) is extracted s The maximum stress of the carcass unit near the ineffective unit when the breaking width is 2.6mm was analyzed to be M s =5.3 MPa (as in fig. 7), the maximum stress of carcass units near ineffective units at 5.2mm fracture width was analyzed to be M s =5.15 MPa (as in fig. 8).
Eighth step, according to the cross-sectional area a of the single carcass cord (a=0.332 mm in this example) 2 ) Calculating the stress F of the carcass cord with the largest stress:
F＝A×M s
i.e. when the analyzed breaking width is 2.6 mm:
F 2.6 ＝A×M s ＝0.332×5.3＝1.8N
i.e. when the analyzed breaking width is 2.6 mm:
F 2.6 ＝A×M s ＝0.332×5.15＝1.7N
whereas M is the same position according to the carcass cord of the tire not pinned in the second step s =3.56 MPa (as in fig. 9), the stress is:
F 0 ＝A×M s ＝0.332×3.56＝1.2N
ninth, the F calculated in the eighth step is combined with the measured value F of the breaking strength of the carcass cord d =53n, for comparison, the safety factor calculated safety factor p:
the maximum stress and the safety multiple of the tire cord after the tire is pinned can be obtained through the calculation process, the tire cord needs to be encrypted when the safety multiple after the tire is pinned is calculated to be lower than the required safety multiple, and the tire cord distance can be properly increased when the safety multiple after the tire is calculated to be far lower than the required safety multiple, so that guidance is provided for the design and the scheme evaluation of the tire.
In the foregoing, the present invention is merely preferred embodiments, which are based on different implementations of the overall concept of the invention, and the protection scope of the invention is not limited thereto, and any changes or substitutions easily come within the technical scope of the present invention as those skilled in the art should not fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. A method for analyzing the stress of a carcass cord after tire pinning, which is characterized by comprising the following steps:
first, the tire material distribution diagram is meshed, and the analysis pinning position and the broken length of the cord are determinedL c Sum width ofL d Nails based on analysisPuncture location and cord break widthL d Encrypting the grid at the corresponding position of the matrix, and pinning the two-dimensional grid size of the positionL w Less than or equal toL d Performing two-dimensional axisymmetric inflation analysis;
secondly, on the basis of inflation analysis, the two-dimensional axisymmetric model is rotated for one circle, and the fracture length of the pinning cord is analyzedL c Encrypting the circumferential grid at the grounding center part of the tire to ensure thatL c =n*L k ，n1 or more, whereinL k For the circumferential length of the carcass grid at the ground-contact center of the tire,L w the calculation method of (1) is as follows:L k =θ*r c ；
wherein the method comprises the steps ofθIn order to achieve the radian value of the angle occupied by the grid at the grounding center,r c the radius of the tire body cord at the center of the tire crown;
thirdly, performing inflation analysis and load analysis on the three-dimensional model;
fourth, according to the node and unit information of the inflated three-dimensional model, finding the unit number of the tire body cord at the grounding center part, and according to the analyzed breaking width of the tire body cordL c And the circumferential length of the carcass grid at the grounding center of the tireL k The relation n between the two, the number m of the units to be selected is determined, m=n, according to the breaking widthL d And two-dimensional grid sizeL w The relation of the tire cord unit numbers of the ground center part to be specially designed is determined;
fifthly, setting the attribute of the unit selected in the third step as dead in the three-dimensional simulation analysis input model of the tire in the second step by utilizing a dead unit technology of simulation software, namely the unit does not participate in calculation, and the unit is invalid;
sixthly, performing inflation analysis on the completed model set in the fifth step;
seventh, carrying out load analysis of a specified load on the analysis model on the analysis result of the sixth step;
eighth step of extracting a maximum value of stress in the carcass cord direction in a unit in the vicinity of the unit where the attribute is set to be deadM s ；
Ninth step, according to the cross-sectional area of the single carcass cordACalculating the stress of the tire body cord with the largest stressF：F=A*M s ;
A ninth step of performing the calculation in the eighth stepFMeasured value of breaking strength of carcass cordF d Comparing, calculating the safety factorp：p=F d /F;
The maximum stress and the safety multiple of the tire body cord after the tire is pinned can be obtained through the calculation process.
2. The method of claim 1, wherein the tire is a radial tire.
3. A computer device comprising a memory, a processor and a computer program stored on the memory, characterized in that the processor executes the computer program to implement the method of any of claims 1-2.
4. A computer readable storage medium having stored thereon a computer program or instructions which, when executed by a processor, implements the method of any of claims 1-2.
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| JP4792049B2 (en) * | 2008-01-09 | 2011-10-12 | 住友ゴム工業株式会社 | Tire noise performance simulation method and tire manufacturing method |
| JP2009190427A (en) * | 2008-02-12 | 2009-08-27 | Yokohama Rubber Co Ltd:The | Tire simulation method |
| JP4621271B2 (en) * | 2008-07-29 | 2011-01-26 | 住友ゴム工業株式会社 | Tire simulation method |
| JP6329440B2 (en) * | 2014-06-18 | 2018-05-23 | 住友ゴム工業株式会社 | Tire simulation method |
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