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Characterization method for compression stress softening and transient-persistent deformation of elastic body

A technology of compressive stress and permanent deformation, which is applied in the characterization of compressive stress softening and transient permanent deformation of elastomers, and the quantitative characterization of elastic compressive stress softening and transient permanent deformation

Inactive Publication Date: 2014-05-07
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Technical problem: The purpose of the present invention is to propose a characterization method for compressive stress softening and transient permanent deformation of elastomers, and to solve the problem that there is no generally accepted characterization method for stress softening and transient permanent deformation of elastomers under uniaxial cyclic compression conditions. question

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  • Characterization method for compression stress softening and transient-persistent deformation of elastic body
  • Characterization method for compression stress softening and transient-persistent deformation of elastic body
  • Characterization method for compression stress softening and transient-persistent deformation of elastic body

Examples

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Embodiment 1

[0019] Example 1: Characterization of Compressive Stress Softening and Transient Permanent Set of Cyclic Compression of NBR Vulcanized Rubber

[0020] Prepare cylindrical NBR vulcanized rubber samples by molding method, and the samples should not have air bubbles, impurities and damage. Use GT-TCS-2000 electronic tensile machine to carry out uniaxial cyclic compression test on the sample, the compression strain is 35%, the speed of the compression sample and the relaxation sample during the cyclic compression process are both 5mm / min; the sample is pressed according to the program Continuously carry out 5 cycles of compression under the set compressive strain; the compressive stress-strain curve is shown in figure 1 .

[0021] figure 1 The peak stress in each cyclic compression pack is the compressive stress corresponding to each compression to 35% compressive strain. Five uniaxial cyclic compressions were performed on NBR vulcanized rubber, and the compressive stress is sh...

Embodiment 2

[0022] Example 2: Characterization of Compressive Stress Softening and Transient Permanent Set of Cyclic Compression of Carbon Black Filled NBR Vulcanizates

[0023] Prepare cylindrical carbon black-filled NBR vulcanized rubber samples by molding method, and the samples should not have air bubbles, impurities and damage. Use GT-TCS-2000 electronic tensile machine to carry out uniaxial cyclic compression test on the sample, the compression strain is 25%, the speed of the compressed sample and the relaxed sample during the cyclic compression process are both 5mm / min; the sample is pressed according to the program Continuously carry out 5 cycles of compression under the set compressive strain; the compressive stress-strain curve is shown in figure 2 .

[0024] according to figure 2 The quantitative data of compressive stress softening and instantaneous permanent deformation of carbon black filled NBR vulcanized rubber calculated from the data in Table 2 are shown in Table 2. ...

Embodiment 3

[0025] Example 3: Characterization of Compressive Stress Softening and Transient Permanent Set for Cyclic Compression of Dynamically Vulcanized ABS / NBR Thermoplastic Elastomers

[0026] Prepare cylindrical dynamic vulcanized ABS / NBR thermoplastic elastomer samples by molding method, and the samples should not have air bubbles, impurities and damage. Use GT-TCS-2000 electronic tensile machine to carry out uniaxial cyclic compression test on the sample, the compression strain is 10%, the speed of the compressed sample and the relaxed sample during the cyclic compression process are both 5mm / min; the sample is pressed according to the program Continuously carry out 5 cycles of compression under the set compressive strain; the compressive stress-strain curve is shown in image 3 .

[0027] according to image 3 The quantitative data of compressive stress softening and instantaneous permanent deformation of dynamic vulcanized ABS / NBR thermoplastic elastomer samples calculated fro...

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Abstract

The invention relates to a characterization method for the compression stress softening and transient-persistent deformation of an elastic body and provides an effective method for evaluating the stress softening and transient-persistent deformation of the elastic body under circular compression. A quantitative characterization method comprises the following steps: (a) carrying out single-shaft circular compression test on a columnar sample on a universal tensile test machine, and repeatedly and continuously compressing and releasing the sample at the same speed, so as to acquire a circular compression stress-strain curve; (b) reading the compression stress when the sample is compressed to a specific compression strain each time from the circular compression stress-strain curve, thus acquiring quantitative stress softening data under a circular compression mode; (c) calculating an instant height H1 of the sample according to the residual strain when the stress is reduced to 0 in each compression period on the circular compression stress-strain curve and recording transient compression deformation as K, wherein the initial height of the columnar sample is h0, the height of the columnar sample is hs when the sample is compressed to reach a stipulated compression strain, and a calculation formula is shown in the specification.

Description

technical field [0001] The invention belongs to the technical field of polymer elastomers, and in particular relates to a characterization method for compressive stress softening and transient permanent deformation of elastomers, in particular to a method for testing the uniaxial cyclic compressive stress-strain properties of elastomer samples, A quantitative characterization method for compressive stress softening and transient permanent deformation of elastomers is obtained. Background technique [0002] Elastomer is a general term for high-molecular materials with high elasticity and low permanent deformation. It can undergo large deformation under stress conditions. When the external force is removed, it can quickly return to its approximate original shape and size; There are two types of thermosetting elastomers and thermoplastic elastomers. Among them, thermosetting elastomers are rubber in the traditional sense. The stress softening phenomenon of elastomers after the...

Claims

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Application Information

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IPC IPC(8): G01N3/32
Inventor 王兆波魏东亚赵静杜芳林
Owner QINGDAO UNIV OF SCI & TECH
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