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Characterization method for stress softening and instantaneous residual strain in elastomer tearing mode

A residual strain, elastic body technology, applied in the direction of strength characteristics, testing material strength using applied repetitive force/pulsation force, instrumentation, etc.

Pending Publication Date: 2020-01-03
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The stress softening and transient residual strain of elastomers under uniaxial cyclic tearing conditions are important properties of elastomers. At present, the stress softening and transient residual strains of elastomers are only limited to tests in tension mode and compression mode. The behavior of stress softening and transient residual strain under tearing mode is rarely reported, so there is an urgent need for a quantitative characterization method for stress softening and transient residual strain of elastomers during uniaxial cyclic tearing

Method used

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  • Characterization method for stress softening and instantaneous residual strain in elastomer tearing mode
  • Characterization method for stress softening and instantaneous residual strain in elastomer tearing mode
  • Characterization method for stress softening and instantaneous residual strain in elastomer tearing mode

Examples

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Embodiment 1

[0018] Example 1: Characterization of Uniaxial Cyclic Tear Stress Softening and Transient Residual Strain of SBS Thermoplastic Elastomer

[0019] Prepare the tear sample of SBS thermoplastic elastomer by molding method, the thickness of the sample is 1.77mm, the SBS brand is YH-792, the styrene content is 40%, the sample should not have air bubbles, impurities and damage, and the initial distance between the marking lines of the sample is 50mm . The GT-TCS-2000 universal material testing machine was used to carry out the uniaxial cyclic tear test on the sample, and the tear strains were 20%, 40% and 60%, respectively. The tear sample and relaxation test in the uniaxial cyclic tear process The speed of the sample is 50mm / min; the sample is continuously torn for 5 times under the tear strain set by the program; the tear strength-strain curve is shown in figure 1 .

[0020] according to figure 1 The quantitative data of uniaxial cyclic tear stress softening and instantaneous r...

Embodiment 2

[0021] Example 2: Characterization of uniaxial cyclic tear stress softening and transient residual strain of PP / EPDM thermoplastic vulcanizate

[0022] The tear sample of PP / EPDM thermoplastic vulcanizate was prepared by molding method. The thickness of the sample was 2.12mm. It was prepared by dynamic vulcanization of sulfur vulcanization system. There should be air bubbles, impurities and damage, and the initial distance between the marking lines of the sample is 50mm. Adopt GT-TCS-2000 universal material testing machine to carry out uniaxial cyclic tear test to the sample, the tear strain is 40%, and the speed of the tearing sample and the relaxation sample in the uniaxial cyclic tearing process are both 50mm / min; The sample is continuously torn for 5 times under the tear strain set by the program; the tear strength-strain curve is shown in figure 2 .

[0023] according to figure 2 The quantitative data of uniaxial cyclic tear stress softening and instantaneous residu...

Embodiment 3

[0024] Example 3: Characterization of uniaxial cyclic tear stress softening and transient residual strain of EAA / NBR thermoplastic vulcanizate

[0025] The tear sample of EAA / NBR thermoplastic vulcanizate was prepared by molding method. The thickness of the sample was 1.71mm. It was prepared by dynamic vulcanization of peroxide vulcanization system. The sample should not have air bubbles, impurities and damage, and the initial distance between the marking lines of the sample is 50mm. Adopt GT-TCS-2000 universal material testing machine to carry out uniaxial cyclic tear test to the sample, the tear strain is 40%, and the speed of the tearing sample and the relaxation sample in the uniaxial cyclic tearing process are both 50mm / min; The sample is continuously torn for 5 times under the tear strain set by the program; the tear strength-strain curve is shown in image 3 .

[0026] according to image 3 The quantitative data of uniaxial cyclic tear stress softening and instantan...

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Abstract

The invention relates to a characterization method for stress softening and instantaneous residual strain in an elastomer tearing mode, and provides an effective method for evaluating the stress softening and the instantaneous residual strain of an elastomer in a uniaxial cyclic tearing strength-strain test. The quantitative characterization method comprises the steps of: a, subjecting a right-angled tearing test sample to the uniaxial cyclic tearing strength-strain test on a universal material testing machine, and repeatedly and continuously tearing and loosening the test sample at the same speed to obtain a uniaxial cyclic tearing strength-strain curve; b, reading the stress when the sample is stretched to a specific strain in a tearing mode each time from the tearing strength-strain curve, so as to obtain stress softening data; c, and regarding an initial distance between two parallel marked lines of the right-angled tearing sample as l0, regarding an instantaneous distance betweenthe two parallel marked lines as li when the stress is reduced to zero in the uniaxial cyclic tearing strength-strain test period, and calculating the instantaneous residual strain according to a formula shown in description.

Description

technical field [0001] The invention belongs to the technical field of polymer elastomers, and in particular relates to a characterization method for stress softening and transient residual strain in an elastomer tearing mode, in particular to a method for testing the uniaxial cyclic tear strength of an elastomer sample -Strain performance, to obtain quantitative characterization methods of stress softening and transient residual strain of elastomers under tearing mode. Background technique [0002] Polymer elastomers have high elasticity and low permanent deformation, and can undergo large deformation under the action of external force. When the external force is removed, they can quickly return to their original shape and size; elastomers are divided into thermosetting elastomers and thermoplastics according to whether they can be plasticized. There are two types of elastomers. Among them, thermosetting elastomers are vulcanized rubber in the traditional sense. Elastomers...

Claims

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Application Information

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IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0017G01N2203/0067G01N2203/0218G01N2203/0252G01N2203/0676G01N2203/0682
Inventor 王兆波孙颖涛杨林基
Owner QINGDAO UNIV OF SCI & TECH
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