A rubber lateral dynamic stress-strain test method

Abstract

The present invention discloses a rubber lateral dynamic stress and strain test method. By setting the deformation amount #imgabs0# and deformation frequency #imgabs1# of a finished tire sidewall rubber sample, crack conditions of the sidewall rubber sample under lateral stress and strain conditions within a fixed time are detected; or by setting the deformation frequency #imgabs2# of the sidewall rubber sample, the number of deformations when cracks appear in the sidewall rubber sample is detected according to the time when cracks appear in the sidewall rubber sample. Different from other test methods that only perform radial stress and strain analysis on the rubber sample, this method simulates the deformation amount and number of deformations of the tire sidewall during actual use of the tire, performs dynamic stress and strain tests on the sample, verifies the crack conditions of the sample under different strain times, thereby reflecting the quality of the tire during actual use and verifying the dynamic performance of the rubber and the service life of the tire.

Description

Technical Field

[0001] The invention relates to a rubber lateral dynamic stress-strain test method, belonging to the technical field of rubber test verification methods. Background Art

[0002] During use, tires deform under the forces of the vehicle itself and the vehicle load. The extent of the lateral deformation of the tire sidewall has a crucial impact on the tire's performance. Excessive sidewall deformation can accelerate flexural cracking or accelerate tire heating, leading to air loss and blowout. The tire industry currently conducts numerous stress-strain tests on vulcanized rubber, such as using rubber processing analyzers to measure the relationship between dynamic modulus and mechanical loss under vibration load and temperature, and determining flex cracking and crack growth in vulcanized rubber. However, no test method currently exists that can simulate the lateral stress and strain experienced during actual use of a pneumatic tire and test rubber specimens or finished tires to verify the rubber's dynamic performance and tire life. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art. By studying the stress, strain and mechanical properties of tire rubber, a rubber lateral dynamic stress and strain test is designed to optimize the technical design scheme.

[0004] The present invention is realized by the following technical scheme: a rubber lateral dynamic stress-strain test method, by setting the deformation of the finished tire sidewall rubber sample and deformation frequency , detect cracks in sidewall rubber specimens under lateral stress and strain conditions within a fixed time;

[0005] Or set the deformation frequency of the sidewall rubber sample , according to the time when cracks appear on the sidewall rubber sample, the number of deformations when cracks appear on the sidewall rubber sample is detected;

[0006] The specific method is:

[0007] 1. Calculate the deformation of the sidewall rubber sample ,in Inflatable section width, is the actual section width under standard load, in units of (mm);

[0008] 2. Calculate the deformation frequency of the sidewall rubber sample , to set the device operating frequency , unit (times / min), where Designed speed of the tire, in km / h, rolling radius of the tire , unit is (mm);

[0009] 3. Through shape variables and deformation frequency , using the rubber lateral dynamic stress and strain test device to test, when the sidewall rubber sample breaks, the total test time is obtained , unit (h);

[0010] Through the above method, the deformation capacity of the tire sidewall during actual use and the time it takes for the tire rubber compound to crack under lateral stress and strain can be directly detected. , so as to achieve the purpose of verifying the dynamic performance of rubber and the service life of tires.

[0011] As a preferred embodiment of the rubber lateral dynamic stress and strain test method of the present invention: the rubber lateral dynamic stress and strain test device includes a base, a power device and a sample fixing device;

[0012] The power device is used to provide power for the deformation of the sidewall rubber sample;

[0013] The sample fixing device is used to clamp and fix the sidewall rubber sample;

[0014] The power device and the sample fixing device are both installed on the base.

[0015] As a preferred solution of the rubber lateral dynamic stress-strain test method described in the present invention: the power device is composed of an AC reciprocating motor, a linear push rod motor, a speed control switch and a counter;

[0016] The AC reciprocating motor provides power to the linear push rod motor; the speed regulating switch is used to adjust the movement frequency of the AC reciprocating motor;

[0017] The counter is used to record the number of reciprocating times of the linear push rod motor.

[0018] As a preferred solution of the rubber lateral dynamic stress and strain test method of the present invention: it also includes a rubber stress and deformation feeler mounted on the linear push rod motor;

[0019] The rubber stress deformation touch rod adjusts the deformation amount x of the sidewall rubber sample;

[0020] A deformation contact with thread-adjustable distance is installed on the free end of the rubber stress deformation contact rod.

[0021] As a preferred solution of the rubber lateral dynamic stress-strain test method described in the present invention: the front end of the deformation contact is an arc, and the radius of the arc is 1 / 2 of the width of the sidewall rubber sample.

[0022] As a preferred solution of the rubber lateral dynamic stress-strain test method described in the present invention: the sample fixing device includes a radial slide rail vertically fixed to the base, a slider and a U-shaped fixing groove installed on the radial slide rail;

[0023] The slider and the U-shaped fixing groove are fixedly connected by bolts;

[0024] A clamping plate for clamping the sidewall rubber sample is provided in the U-shaped fixing groove.

[0025] As a preferred solution of the rubber lateral dynamic stress-strain test method described in the present invention: in order to facilitate clamping the two ends of the sidewall rubber sample, two sliders and two U-shaped fixing grooves are provided, which are distributed up and down on the radial slide rail.

[0026] The advantages of the present invention are: unlike other test methods that only perform radial stress and strain analysis on rubber samples, this method simulates the tire sidewall deformation and deformation times during actual use of the tire, performs dynamic stress and strain tests on the samples, and verifies the crack conditions of the samples under different strain times, thereby reflecting the quality of the tire during actual use and verifying the dynamic performance of the rubber and the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a rubber lateral dynamic stress and strain test device;

[0028] In the figure: 1-base; 2-power device; 3-U-shaped fixing groove; 4-clamping plate; 5-slider; 6-radial slide rail; 7-rubber stress deformation touch rod; 8-rubber test piece. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0032] Reference Figure 1As shown in the figure, as the first embodiment of the present invention, a rubber lateral dynamic stress-strain test method is provided, by setting the deformation amount of the finished tire sidewall rubber sample 8 and deformation frequency , detecting cracks in the sidewall rubber sample 8 under lateral stress and strain conditions within a fixed time;

[0033] Or set the deformation frequency of the sidewall rubber sample 8 , according to the time when the sidewall rubber sample 8 cracks appear, the number of deformations when the sidewall rubber sample cracks appear is detected;

[0034] The specific method is:

[0035] 1. Calculate the deformation of sidewall rubber sample 8 ,in Inflatable section width, is the actual section width under standard load, in mm;

[0036] 2. Calculation of the deformation frequency of sidewall rubber sample 8 , to set the device operating frequency , unit: times / min, where The design speed of the tire, in km / h, and the rolling radius of the tire , unit is mm;

[0037] 3. Through shape variables and deformation frequency , using the rubber lateral dynamic stress and strain test device to test, when the sidewall rubber sample 8 breaks, the total test time is obtained , unit h;

[0038] By using the above method, the deformation capacity of the tire sidewall rubber sample 8 during actual use and the time it takes for the tire rubber compound to crack under lateral stress and strain can be directly detected. , so as to achieve the purpose of verifying the dynamic performance of rubber and the service life of tires.

[0039] The rubber lateral dynamic stress and strain testing device comprises a base 1, a power device 2 and a sample fixing device;

[0040] The power device 2 is used to provide power for the deformation of the sidewall rubber sample 8;

[0041] The sample fixing device is used to clamp and fix the sidewall rubber sample 8;

[0042] The power device 2 and the sample fixing device are both installed on the base 1 .

[0043] The power unit 2 is composed of an AC reciprocating motor, a linear push rod motor, a speed regulating switch and a counter;

[0044] The AC reciprocating motor provides power to the linear push rod motor; the speed regulating switch is used to adjust the movement frequency of the AC reciprocating motor;

[0045] The counter is used to record the number of reciprocating times of the linear push rod motor.

[0046] It also includes a rubber stress deformation contact rod 7 installed on the linear push rod motor;

[0047] The rubber stress deformation feeler 7 adjusts the deformation amount x of the sidewall rubber sample 8;

[0048] A deformation contact with thread-adjustable distance is installed on the free end of the rubber stress deformation contact rod 7 .

[0049] The front end of the deformation contact is an arc, and the radius of the arc is 1 / 2 of the width of the sidewall rubber sample 8.

[0050] The sample fixing device includes a radial slide rail 6 vertically fixed on the base 1, a slider 5 and a U-shaped fixing groove 3 installed on the radial slide rail 6;

[0051] The slider 5 and the U-shaped fixing groove 3 are fixedly connected by bolts;

[0052] A clamping plate 4 for clamping a sidewall rubber sample 8 is provided in the U-shaped fixing groove 3 .

[0053] In order to facilitate clamping of both ends of the sidewall rubber sample 8 , two sliders 5 and two U-shaped fixing grooves 3 are provided, which are distributed up and down on the radial slide rail 6 .

[0054] Specifically, this test method can fully simulate the lateral strain of the tire rubber under stress during actual use, thereby directly detecting the strain deformation capacity of the tire rubber during actual use and the time it takes for cracks to appear in the tire rubber under lateral stress and strain, thereby achieving the purpose of verifying the dynamic performance of the rubber and the service life of the tire.

[0055] Deformation of the sidewall rubber sample and deformation frequency The deformation and deformation frequency of the tire under standard load and air pressure can be determined by referring to the parameters of this test equipment. The deformation and deformation frequency of the tire during use can be simulated by adjusting the stroke of the test equipment. The adjustable range is 0-200mm; the deformation frequency This can be achieved by adjusting the operating frequency of the equipment, and the adjustable range is 0-1500 times / min.

[0056] The thickness of the sidewall rubber sample 8 should be determined to be 6 mm based on the thickness of the sidewall rubber material of agricultural tires and engineering tires. The width of the sidewall rubber sample 8 should be 25 mm and the length should be 200 mm. The slider 5 can move up and down along the radial slide rail 6 to ensure that the rubber test piece 8 has a certain extension and can be adjusted so that the stress of the rubber stress deformation feeler 7 can act on the center position of the sidewall rubber sample 8.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A rubber lateral dynamic stress-strain test method, characterized by: By setting the deformation of the finished tire sidewall rubber sample and deformation frequency , detect cracks in sidewall rubber specimens under lateral stress and strain conditions within a fixed time; Or set the deformation frequency of the sidewall rubber sample , according to the time when cracks appear on the sidewall rubber sample, the number of deformations when cracks appear on the sidewall rubber sample is detected; The specific method is:

1. Calculate the deformation of the sidewall rubber sample ,in is the inflated section width, is the actual section width under standard load, in mm; 2. Calculate the deformation frequency of the sidewall rubber sample , to set the device operating frequency , the unit is times / min, where is the design speed of the tire, in km / h, and the rolling radius of the tire , unit is mm; 3. Through shape variables and deformation frequency , using the rubber lateral dynamic stress and strain test device to test, when the sidewall rubber sample breaks, the total test time is obtained , unit is h; Through the above method, the deformation capacity of the tire sidewall during actual use and the time it takes for the tire rubber compound to crack under lateral stress and strain can be directly detected. , to achieve the purpose of verifying the dynamic performance of rubber and the service life of tires; The rubber lateral dynamic stress and strain testing device comprises a base (1), a power device (2) and a sample fixing device; The power device (2) is used to provide power for deformation of the sidewall rubber sample; The sample fixing device is used to clamp and fix the sidewall rubber sample; The power device (2) and the sample fixing device are both installed on the base (1).

2. A rubber lateral dynamic stress-strain test method according to claim 1, characterized in that: The power device (2) is composed of an AC reciprocating motor, a linear push rod motor, a speed regulating switch and a counter; The AC reciprocating motor provides power to the linear push rod motor; the speed regulating switch is used to adjust the movement frequency of the AC reciprocating motor; The counter is used to record the number of reciprocating times of the linear push rod motor.

3. A rubber lateral dynamic stress-strain test method according to claim 2, characterized in that: Also included is a rubber stress-deformation contact rod (7) mounted on the linear push rod motor; The rubber stress deformation touch rod (7) adjusts the deformation amount x of the sidewall rubber sample; A deformation contact with thread-adjustable distance is installed on the free end of the rubber stress deformation contact rod (7).

4. A rubber lateral dynamic stress-strain test method according to claim 3, characterized in that: The front end of the deformation contact is an arc, and the radius of the arc is 1 / 2 of the width of the sidewall rubber sample.

5. The rubber lateral dynamic stress-strain test method according to claim 2, characterized in that: The sample fixing device comprises a radial slide rail (6) vertically fixed on the base (1), a slider (5) mounted on the radial slide rail (6) and a U-shaped fixing groove (3); The slider (5) and the U-shaped fixing groove (3) are fixedly connected by bolts; A clamping plate (4) for clamping the sidewall rubber sample is provided in the U-shaped fixing groove (3).

6. A rubber lateral dynamic stress-strain test method according to claim 5, characterized in that: In order to facilitate clamping of both ends of the sidewall rubber sample, two sliders (5) and two U-shaped fixing grooves (3) are provided, which are distributed up and down on the radial slide rail (6).

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