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Evaluation method of rubber-plastic viscoelasticity element fatigue performance

A technology of fatigue performance and components, applied in the testing of machines/structural components, instruments, measuring devices, etc., can solve the difficulty in selecting stiffness ranges, differences in stiffness, wear and surface cracks, and unknown differences in product performance impacts, etc. problems, to achieve the effect of facilitating quantitative analysis and comparison, shortening test time, and saving test costs

Inactive Publication Date: 2008-05-28
DONGFENG MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above detection methods have large errors and are prone to misjudgment.
Due to the non-linear stiffness of rubber products and the permanent deformation of the rubber layer caused by long-term stress, it is easy to cause difficulties in the selection of stiffness intervals and large stiffness calculation errors
In addition, there are differences in the wear and surface crack states of each sample, and the difference in the impact on product performance is unknown, and it is difficult to quantitatively describe and specify, so it is not convenient to horizontally evaluate the fatigue durability of each sample

Method used

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  • Evaluation method of rubber-plastic viscoelasticity element fatigue performance
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  • Evaluation method of rubber-plastic viscoelasticity element fatigue performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Taking the development test of a rubber bushing for an air suspension system of a certain vehicle type as an example, the application of the present invention in automobile rubber damping components is described. (The products involved in the following are all materials of the same formula, only the difference in product shape and structure) The rubber bushing is integrally press-fitted into the metal sleeve at the front end of the car's air suspension beam to realize the flexibility of the frame and axle It is connected to play the role of bearing, buffering and noise reduction, with a rated load of 60,000 N

[0062] By adopting the method of the present invention, the fatigue resistance of different products under the same working condition is assessed according to the set test cycle index.

[0063] 1-1. Test method: Under the same test cycle, test the energy loss change rate ΔE of the two samples A and B before and after the fatigue test.

[0064] 1-1.1 Test equipment: M...

Embodiment 2

[0103] 2-1 Test method: According to the set energy loss change rate ΔEx index, test the number of test cycles Nx when the A and B samples reach the fatigue limit, that is, the energy loss change rate ΔEx index under the same working conditions.

[0104] 2-1.1 Test equipment: MTS810 dynamic and static universal testing machine.

[0105] 2-1.2 Test parameters: The test frequency is 3Hz, and the energy loss rate of change of the two samples A and B reaches the fatigue limit ΔEx=±10%.

[0106] 2-1.3 Dynamic load range: radial static load 33000 N, radial dynamic load ± 27000 N

[0107] 2-2 Test procedure:

[0108] Step 2-2.1 is the same as the step 1-2.1 in Example 1.

[0109] 2-2.2 Set test parameters: same as steps 1-2.2 in Example 1.

[0110] 2-2.3 The fatigue test starts after 6000 times of dynamic vibration. After the dynamic fatigue test starts, the test data of the load-displacement closed curve of the first three adjacent cycles is recorded, and the average value of the record...

Embodiment 3

[0130] 3-1. Test method: The radial stiffness curve of sample A in Example 1 was tested by a traditional method (stiffness change rate) to verify the accuracy of the method data of the present invention.

[0131] 3-1.1 Test equipment: MTS810 dynamic and static universal testing machine or material testing machine.

[0132] 3-1.2 Test parameters: Test frequency 3Hz, fatigue test period 1.0×10 7 The test speed is 2mm / min and the static load is 60000N.

[0133] 3-2. Test steps:

[0134] 3-2.1 is the same as the steps of 1-2.1 in Example 1.

[0135] 3-2.2 is the same as the steps of 1-2.2 in Example 1,

[0136] 3-2.3 The fatigue test starts after 6000 times of dynamic vibration. After the dynamic fatigue test starts, test and draw the stiffness curves P1 and P2 of sample A before and after the fatigue test:

[0137] In the test, record the radial displacement of sample A due to load changes, and draw the stiffness curve P1 of sample A before the fatigue test and the stiffness curve P2...

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Abstract

The invention discloses a method for evaluating fatigue performances of viscoelastic components as rubber, plastic, and the like, which comprises testing energy lost changing rate in a given testing period, or testing the number of test periods when given energy lost changing quantity is reached, thereby bench fatigue testing service life of different products can be evaluated. Value of the energy lost changing rate has strong association with fatigue degrees of the products and is convenient for quantitative analysis and comparisons, the fatigue degrees of products inner structures can be reflected directly and actually, and damping buffering performances of the products can be defined accurately, which are used as measurement indexes for product quality control. The testing method is simple and has high accuracy, thereby testing time of fatigue service life tests can be shortened, testing cost can be saved, and the damping buffering performances of the products can be reflected thoroughly. The testing method is applicable to damping performance tests and evaluations of various viscoelastic products, and convenient to assess crosswise anti-fatigue performances between various products.

Description

Technical field [0001] The invention relates to a method for testing the performance of an elastic device. Specifically, it relates to a method for evaluating the fatigue performance of viscoelastic components such as rubber and plastics. Background technique [0002] For automotive rubber damping products such as suspensions, bushings, air springs, spherical hinges, etc., companies not only require products with certain damping performance, but also require products with a relatively stable damping performance and a long service life. The domestic and foreign automotive industry and most companies usually use bench equipment to simulate dynamic operating conditions, and perform fatigue life testing and assessment of products. By measuring the change in product stiffness, the change in the size of the rubber structure or the degradation of the appearance quality (cracks and abrasion on the rubber surface), these indirectly reflect the size of the physical quantity of vibration da...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01M19/00G01M99/00
Inventor 刘伟李箐杨丹刘尚顺
Owner DONGFENG MOTOR CO LTD
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