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Fixture and testing method for polymer cord/rubber interface fatigue performance test

A fatigue performance testing, polymer technology, used in the application of repetitive force/pulsation force to test the strength of materials, measuring devices, strength characteristics, etc., which can solve the evaluation of limited application, increased cord extraction life, and limited to static performance and other problems, to achieve the effect of uniform shear stress distribution, wide available frequency, and flexible test conditions.

Active Publication Date: 2022-06-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing cord / rubber adhesive performance evaluation methods are also limited to the evaluation of static performance, such as the H-type sample extraction method and the T-type sample extraction method for evaluating polymer cord / rubber adhesive performance. There are EC method and ASTM method for evaluating steel cord / rubber adhesive performance, these methods can only measure the average interfacial shear strength of cord / rubber under quasi-static condition by controlling the tensile speed, which mainly has two limitations Sex: First, due to the stress concentration caused by the clamping method, the average interface shear strength cannot represent the real interface adhesion performance. Second, because the actual working condition of the tire is rolling, the materials of the various components in the tire are subjected to long-term alternating loads , the evaluation results provided by the static method cannot reflect the evolution of the adhesive properties of the cord / rubber under dynamic conditions such as different frequencies and loading
Due to the clamping method of the H-type sample, the stress concentration and large deformation of the rubber at the jaws are caused. During the dynamic loading process, the rubber at the jaws is very easy to crack, resulting in inaccurate evaluation results of dynamic adhesion performance. The most direct impact is After the rubber at the clamp is damaged, the cord extraction life is abnormally increased
Another method is to directly vulcanize the cord after calendering to prepare a laminated composite material representing the tire carcass structure, and test the dynamic fatigue life of the composite material or the residual interlayer peeling performance after a certain degree of fatigue. The calendering required by this method Cords are difficult to make in the laboratory, which also limits the application of this method to preferred rubber formulations

Method used

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  • Fixture and testing method for polymer cord/rubber interface fatigue performance test
  • Fixture and testing method for polymer cord/rubber interface fatigue performance test
  • Fixture and testing method for polymer cord/rubber interface fatigue performance test

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Step 1, take isoprene rubber 100phr, zinc oxide 5.0phr, stearic acid 2.0phr, antioxidant 4.0phr, carbon black N330 40.0phr, accelerator 1.6phr, vulcanizing agent 1.9phr, anti-coking agent 0.2phr, add isoprene rubber to the mixer, after mixing to get the parent rubber, move into the opener, add zinc oxide, stearic acid, antioxidant, carbon black, accelerator, vulcanizing agent and anti-coking agent, left and right cutting, thinning after the lower tablet, the thickness of the lower tablet is 2mm, Obtain the mixing rubber, park the mixing rubber at room temperature for 16h, and cut a number of 10×200mm rubber strips;

[0070] Step 2: Place two strips in the bottom model cavity of the vulcanization mold, lay 12 nylon 66 cords with a length of 400mm on the strips, with a specification of 1400dtex / 2, one end of each cord is bolted through the trunking, and the other end is bolted through the trunk and suspended with 50g weights;

[0071]Place the middle die on the bottom mold an...

Embodiment 2

[0076] Example 2 and the sample preparation process of Example 1 is the same, the difference is that in step three, the load amplitude is fixed to 50N, the fatigue cycle is set to 150,000 times, after the fatigue test is completed, the electronic fatigue testing machine is set to move upward at a speed of 50mm / min, and the residual extraction force of the single cord / rubber composite specimen is obtained is 86N.

Embodiment 3

[0078]Example 3 is the same as the sample preparation process of Example 1, the difference is that in step three, the load amplitude is fixed to 40N, the fatigue cycle is set to 150,000 times, after the fatigue test is completed, the electronic fatigue testing machine is provided to act as a moving cylinder at a speed of 50mm / min, and the residual extraction force of a single cord / rubber composite specimen is obtained is 112N.

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Abstract

The invention relates to a fixture and a testing method for testing the fatigue performance of a polymer cord / rubber interface, belonging to the technical field of fatigue performance testing. The method solves technical problems such as inaccurate evaluation results of the dynamic adhesive performance evaluation method of the polymer cord / rubber in the prior art, difficult preparation of samples, and the like. The polymer cord / rubber interface fatigue performance test fixture of the present invention comprises an upper fixture, a lower fixture, an upper connecting plate and a lower connecting plate; the upper connecting plate includes a coaxially arranged first disk and a first connecting piece, and the lower The connecting plate includes a second disc and a second connecting piece coaxially arranged, the upper clamp includes an upper clamp seat, a winding wheel and a locking wheel; the lower clamp includes a lower clamp seat, two auxiliary blocks, a lower baffle plate and an adjusting bolt . The method for testing the fatigue performance of the polymer cord / rubber interface is simple, effective and repeatable.

Description

Technical field [0001] The present invention belongs to the field of fatigue performance detection technology, specifically relates to a polymer cord / rubber interface fatigue performance test fixture and test method, especially suitable for aviation tire oblique structure and radial structure of the belt bundle layer, carcass cord in the aramid, nylon and other cords and carcass rubber interface fatigue performance evaluation, by determining the fatigue life under certain fatigue load conditions or residual adhesion strength after fixed cycle fatigue loading, characterize the dynamic evolution of polymer cord and rubber adhesion performance, It provides a theoretical basis for predicting the fatigue life of polymer cord and rubber bonding during tire driving. Background [0002] Tires are mainly made of low strength, high extension rubber matrix and high strength, low extension cord bone structure of composite components, the adhesion of rubber and skeleton materials in tires i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/04G01N3/32
CPCG01N3/04G01N3/32G01N2203/0017G01N2203/0005G01N2203/04
Inventor 杨小牛张弛郇彦
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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