CN114509204A - Stress-strain measurement method for inflated all-steel radial tire - Google Patents
Stress-strain measurement method for inflated all-steel radial tire Download PDFInfo
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- CN114509204A CN114509204A CN202111586593.0A CN202111586593A CN114509204A CN 114509204 A CN114509204 A CN 114509204A CN 202111586593 A CN202111586593 A CN 202111586593A CN 114509204 A CN114509204 A CN 114509204A
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- tire
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- end point
- air pressure
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 238000000691 measurement method Methods 0.000 title claims description 4
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
- G01L17/005—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies using a sensor contacting the exterior surface, e.g. for measuring deformation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Tires In General (AREA)
Abstract
The invention belongs to the field of all-steel radial tires, and particularly relates to a method for measuring stress and strain of an all-steel radial tire after inflation, which comprises the following steps: cutting the tire, and polishing the cut section to be smooth and flat; marking a reference line at the cross section after the parking time is reached, and carrying out inflation parking on the tire according to the conditions of 100kpa, 300kpa, 600kpa and standard air pressure; after each time of inflation to the specified air pressure, the tire is parked for 30 minutes to 1 hour; and obtaining the stress change of the tire according to the calculated data according to the circumferential moving distance W and the inter-rubber thickness H of the belt layer before and after the deformation of the datum line, the radial stretching distance L and the unit rubber length I of the unit rubber length. The method is simple and high in accuracy, and reflects the real stress condition of the tire.
Description
Technical Field
The invention belongs to the field of all-steel radial tires, and particularly relates to a method for measuring stress and strain of an all-steel radial tire after inflation.
Background
The tire, as an important component for connecting a vehicle and a road, is a key factor affecting the driving stability and safety of the vehicle, wherein the mechanical properties of the tire are closely related to the above properties. The traditional tire mechanics research is only based on model guesses accumulated by experience and can not reflect the real stress condition of the tire, so that the research on a real stress measurement analysis method of the tire in the actual use process is necessary.
Disclosure of Invention
The invention aims to provide a method for measuring stress and strain of an all-steel radial tire after inflation, and solve the problem of high difficulty in real stress measurement and analysis in the actual use process of the tire.
The present invention is achieved in such a way that,
a stress-strain measurement method for an all-steel radial tire after inflation comprises the following steps:
cutting the tire, and polishing the cut section to be smooth and flat;
mounting the tire on a rim, firstly inflating to the air pressure of 500-600kpa to confirm that the cutting surface is not abnormal, then inflating the tire to the standard air pressure, parking for 1 hour, then deflating to 100kpa, and then parking for one hour;
marking a reference line at the section after the parking time is reached, wherein the marking reference line comprises:
respectively drawing a line segment on the lower edge of the third belted layer steel wire and the upper edge of the second belted layer, wherein the two line segments are parallel and equal in length, and then drawing a vertical line perpendicular to the two line segments on the upper side;
drawing a line segment along the polished end point of the carcass steel wire, drawing parallel lines parallel to the line segment and upward at an interval of 10mm, wherein the line segment is perpendicular to the parallel lines;
carrying out inflation parking on the tire according to the standard air pressure conditions of 100kpa, 300kpa and 600 kpa; after each time of inflation to the specified air pressure, the tire is parked for 30 minutes to 1 hour;
obtaining 100kpa, 300kpa, 600kpa, circumferential moving distance W of a belt ply and thickness H of the gap rubber under the standard air pressure condition, radial stretching distance L of unit rubber length and unit rubber length I according to the deformation of the datum line, and obtaining the stress change of the tire according to the calculated data.
Further, the calculation of the stress variation includes:
carcass endpoint strain-radial tensile distance per rubber length L-unit rubber length L/unit rubber length L + 100%:
strain (L-L)/L100%;
belt end point strain-belt circumferential movement distance W/inter-belt thickness H100%:
strain W/H100%.
Further, the location of the tire cut includes:
the width from the upper part of the tire shoulder to the end point of the third belt ply is 50 mm;
the extension line from the lower part of the tire shoulder to the endpoint of the second belted layer extends to the position of the tire side surface from 10mm of the tire body;
the cutting position of the tire bead position is 180 degrees corresponding to the tire shoulder cutting position, the position from the tire body turn-up end point to the tire surface is determined according to the section, the cutting position is upwards 45mm away from the tire body turn-up end point position, downwards 15mm away from the tire body turn-up end point position, and the width is 50 mm.
Further, the tire needs to be parked for more than 24 hours after vulcanization before measurement.
Further, at the end of the third belt layer, the ratio of the belt layer rubber moving distance W in the belt layer circumferential direction to the inter-belt rubber thickness H was measured:
ε1＝W/H*100％
at the end point of the turn-up of the tire body, measuring the ratio of the radial stretching distance L per unit rubber length to the length L per unit rubber:
ε2＝(L-l)/l*100％；
the stress variation trend is reflected by the ratio.
Further, a reference patch is arranged beside the reference line and used as a reference length.
Compared with the prior art, the invention has the beneficial effects that:
the method is simple and high in accuracy, and reflects the real stress condition of the tire.
Drawings
FIG. 1 is a belt end reference line provided by an embodiment of the present invention;
FIG. 2 is a carcass end reference line provided in accordance with an embodiment of the present invention;
FIG. 3 is a photograph of belt end points after deformation in one embodiment;
FIG. 4 is a schematic representation of the deformed carcass end points in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A method for measuring stress strain of an all-steel radial tire after inflation comprises the following steps:
cutting the tire, and polishing the cut section to be smooth and flat; the tire needs to be parked for more than 24 hours after vulcanization before measurement. The location at which the tire is cut includes:
the width from the upper part of the tire shoulder to the end point of the third belt ply is 50 mm;
the extension line from the lower part of the tire shoulder to the endpoint of the second belted layer extends to the position of the tire side surface from 10mm of the tire body;
the cutting position of the tire bead position is 180 degrees corresponding to the tire shoulder cutting position, the position from the tire body turn-up end point to the tire surface is determined according to the section, the cutting position is upwards 45mm away from the tire body turn-up end point position, downwards 15mm away from the tire body turn-up end point position, and the width is 50 mm.
Mounting the tire on a rim, firstly inflating to the air pressure of 500-600kpa to confirm that the cutting surface is not abnormal, then inflating the tire to the standard air pressure, parking for 1 hour, then deflating to 100kpa, and then parking for one hour;
referring to fig. 1 in conjunction with fig. 2, after the parking time is reached, marking a reference line at the cross section, where the marking reference line includes:
respectively drawing a line segment on the lower edge of the third belted layer steel wire and the upper edge of the second belted layer, wherein the two line segments are parallel and equal in length, and then drawing a vertical line perpendicular to the two line segments on the upper side;
drawing a line segment along the polished end point of the carcass steel wire, drawing parallel lines parallel to the line segment and upward at an interval of 10mm, wherein the line segment is perpendicular to the parallel lines;
carrying out inflation parking on the tire according to the standard air pressure conditions of 100kpa, 300kpa and 600 kpa; after each time of inflation to the specified air pressure, the tire is parked for 30 minutes to 1 hour;
obtaining 100kpa, 300kpa, 600kpa, circumferential moving distance W of a belt ply and thickness H of the gap rubber under the standard air pressure condition, radial stretching distance L of unit rubber length and unit rubber length I according to the deformation of the datum line, and obtaining the stress change of the tire according to the calculated data.
And a reference paste is arranged beside the reference line and used as a reference length.
Referring to fig. 3 in conjunction with fig. 4, photographs were taken before and after the measurement, and then inserted into software to perform the deformation measurement. According to the measured circumferential moving distance W and the measured thickness H of the intermediate rubber of the belt layer, the unit rubber length radial stretching distance L and the unit rubber length I, the stress change of the tire obtained according to the calculated data comprises the following steps:
the calculation of the stress change includes:
carcass endpoint strain-radial tensile distance per rubber length L-unit rubber length L/unit rubber length L + 100%:
strain (L-L)/L100%;
belt end point strain-belt circumferential movement distance W/inter-belt thickness H100%:
strain W/H100%.
Measuring the ratio of the circumferential moving distance W of the belt ply to the thickness H of the gap ply at the end part of the third belt ply:
ε1＝W/H*100％
at the end point of the turn-up of the tire body, measuring the ratio of the radial stretching distance L per unit rubber length to the length L per unit rubber:
ε2＝(L-l)/l*100％；
the stress variation trend is reflected by the ratio.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A stress-strain measurement method for an all-steel radial tire after inflation is characterized by comprising the following steps:
cutting the tire, and polishing the cut section to be smooth and flat;
mounting the tire on a rim, firstly inflating to the air pressure of 500-600kpa to confirm that the cutting surface is not abnormal, then inflating the tire to the standard air pressure, parking for 1 hour, then deflating to 100kpa, and then parking for one hour;
marking a reference line at the section after the parking time is reached, wherein the marking reference line comprises:
respectively drawing a line segment on the lower edge of the third belted layer steel wire and the upper edge of the second belted layer, wherein the two line segments are parallel and equal in length, and then drawing a vertical line perpendicular to the two line segments on the upper side;
drawing a line segment along the polished end point of the carcass steel wire, drawing parallel lines parallel to the line segment and upward at an interval of 10mm, wherein the line segment is perpendicular to the parallel lines;
carrying out inflation parking on the tire according to the standard air pressure conditions of 100kpa, 300kpa and 600 kpa; after each time of inflation to the specified air pressure, the tire is parked for 30 minutes to 1 hour;
obtaining 100kpa, 300kpa, 600kpa, circumferential moving distance W of a belt ply and thickness H of the gap rubber under the standard air pressure condition, radial stretching distance L of unit rubber length and unit rubber length I according to the deformation of the datum line, and obtaining the stress change of the tire according to the calculated data.
2. The method of claim 1, wherein the calculating of the stress change comprises:
carcass endpoint strain-radial tensile distance per rubber length L-unit rubber length L/unit rubber length L + 100%:
strain (L-L)/L100%;
belt end point strain-belt circumferential movement distance W/inter-belt thickness H100%:
strain W/H100%.
3. The method of claim 1, wherein the location at which the tire is cut comprises:
the width from the upper part of the tire shoulder to the end point of the third belt ply is 50 mm;
the extension line from the lower part of the tire shoulder to the endpoint of the second belted layer extends to the position of the tire side surface from 10mm of the tire body;
the cutting position of the tire bead position is 180 degrees corresponding to the tire shoulder cutting position, the position from the tire body turn-up end point to the tire surface is determined according to the section, the cutting position is upwards 45mm away from the tire body turn-up end point position, downwards 15mm away from the tire body turn-up end point position, and the width is 50 mm.
4. The method of claim 1,
the tire needs to be parked for more than 24 hours after vulcanization before measurement.
5. The method of claim 1,
measuring the ratio of the circumferential moving distance W of the belt ply to the thickness H of the gap ply at the end part of the third belt ply:
ε1＝W/H*100％
at the end point of the turn-up of the tire body, measuring the ratio of the radial stretching distance L per unit rubber length to the length L per unit rubber:
ε2＝(L-l)/l*100％；
the stress variation trend is reflected by the ratio.
6. A method according to claim 1, characterized in that a reference patch is provided beside the reference line for the reference length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111586593.0A CN114509204B (en) | 2021-12-23 | 2021-12-23 | Method for measuring stress and strain of all-steel radial tire after inflation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111586593.0A CN114509204B (en) | 2021-12-23 | 2021-12-23 | Method for measuring stress and strain of all-steel radial tire after inflation |
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| Publication Number | Publication Date |
|---|---|
| CN114509204A true CN114509204A (en) | 2022-05-17 |
| CN114509204B CN114509204B (en) | 2024-01-02 |
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| CN202111586593.0A Active CN114509204B (en) | 2021-12-23 | 2021-12-23 | Method for measuring stress and strain of all-steel radial tire after inflation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116026280A (en) * | 2023-03-29 | 2023-04-28 | 中策橡胶集团股份有限公司 | Automatic detection equipment and detection method for stress and strain of tire sidewall |
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| US4364267A (en) * | 1980-08-20 | 1982-12-21 | The Goodyear Tire & Rubber Company | Method and apparatus for correlating tire inflation pressure and load |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116026280A (en) * | 2023-03-29 | 2023-04-28 | 中策橡胶集团股份有限公司 | Automatic detection equipment and detection method for stress and strain of tire sidewall |
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| CN114509204B (en) | 2024-01-02 |
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