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Method for measuring polymer-base foam material elastic modulus by displacement sensor

A technology of displacement sensor and foam material, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, and analyzing materials, etc. It can solve the problems of small temperature range, small strain gauge range, and large volume to achieve sensitivity High, High Accuracy Effects

Inactive Publication Date: 2009-05-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extensometer generally equipped with the testing machine can also measure the strain of the material, but its volume is large and the applicable temperature range is small
[0003] Resistance strain gauges can also be used to measure the micro-strain of materials, but the strain gauges have a small range and can only be used once

Method used

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  • Method for measuring polymer-base foam material elastic modulus by displacement sensor
  • Method for measuring polymer-base foam material elastic modulus by displacement sensor
  • Method for measuring polymer-base foam material elastic modulus by displacement sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: measure the compressive modulus of elasticity of a kind of PEI foamed plastics at room temperature:

[0025] Displacement sensors (the resistance values ​​of strain gauges R1, R2, R3 and R4 connected to a Wheatstone bridge circuit are 120), fixtures and samples are assembled as follows: image 3 Shown:

[0026] First, according to the measurement area of ​​the sample to be tested, a connecting piece 101 and 102 (clamps) perpendicular to it are respectively fixedly connected at the ends of the first tong arm 11 and the second tong arm 22, and then the connecting pieces 101 and 102 are fixedly connected to each other. respectively connected to both ends of the side wall of the measuring area of ​​the cylindrical polymer foam material to be measured (such as image 3 shown); the connecting wire of the Wheatstone bridge circuit in the displacement sensor is connected with the external strain gauge, and the strain gauge is connected with the computer (the stra...

Embodiment 2

[0029] Embodiment 2: measure a kind of PEI foamed plastics liquid nitrogen temperature zone tensile modulus of elasticity:

[0030] The first clamp arm 11 and the second clamp arm 22 ends of the displacement sensor are respectively fixedly connected with a connecting piece 101 and 102 perpendicular to it, and then the connecting pieces 101 and 102 are connected with the cylindrical polymer foam material to be measured The middle part of the side wall of A is connected (such as Figure 4 shown); after assembling the displacement sensor, the displacement sensor fixture and the sample, as shown in Figure 4 Shown: the connecting wire of the Wheatstone bridge circuit in the displacement sensor is connected with the external strain gauge, and the strain gauge is connected with the computer (the strain gauge and the computer are not shown in the figure, and those skilled in the art should know the connection. ). The test foam material is dumbbell-shaped, and its performance is the...

Embodiment 3

[0033] Embodiment 3, measuring a kind of PEI foamed plastics liquid hydrogen temperature region compressive modulus of elasticity:

[0034] Displacement sensors, displacement sensor fixtures and samples are assembled at the same time image 3 , using liquid helium and temperature control equipment to achieve liquid hydrogen temperature (20K). Test material is identical with embodiment 1,2 test material. The compressive elastic modulus of the liquid hydrogen temperature obtained from the test is shown in Table 3. The sample numbers in Table 3 represent four samples of the same material, and the average value of the compressive elastic modulus of the four samples is the compressive elastic modulus of the material (the standard deviation thereof is 2.63).

[0035] Table 3: Compressive elastic modulus of a PEI foam material at liquid hydrogen temperature

[0036]

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Abstract

A method for measuring elastic modulus of polymer based foam material by utilizing displacement transducer includes fixing measurement zone of said material to be measured on ends of said transducer two pincer arms then placing them into universal material tester, connecting leading wire of said transducer resistance foil gauge connected to be wheatstone bridge to strain gauge separately and connecting strain gauge to computer, exerting compression or tensile force on said material for obtaining stress - strain data then sending it to computer for plotting out stress - strain curve then obtaining said material property modulus as per the curve.

Description

technical field [0001] The present invention belongs to the measurement method of the material performance test in the technical field of mechanics, specifically relates to a kind of method that can measure the elastic modulus of polymer base foam material with displacement sensor in wide temperature range (4.2K-300K). technical background [0002] Polymer-based foams are widely used in packaging, cushioning, and low-temperature insulation materials due to their high specific modulus, specific strength, and excellent thermal insulation properties. This requires the study of mechanical properties such as tension and compression of polymer-based foam materials. In practice, it is relatively easy to measure the tensile and compressive strength of polymer-based foams, but it is difficult to measure the elastic modulus. Because the elastic modulus test of the material is mainly to accurately measure the stress-strain (σ-ε) relationship of the material, and the key to the stress-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N19/00G01B7/16
Inventor 付绍云黄传军潘勤彦赵立中
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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