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Test device and method of biaxial mechanical capability of ETFE (ethylene tetra fluoro ethylene) film

A technology of a testing device and a testing method, applied in the field of architectural design, can solve the problem of no ETFE film material performance research, etc., and achieve the effects of good repeatability, high precision of measuring instruments, and simple testing methods.

Inactive Publication Date: 2015-09-09
EAST CHINA ARCHITECTURAL DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a device and method for testing the bidirectional mechanical properties of ETFE films, so as to overcome the problem that there is no research on the material properties of ETFE films under the bidirectional stress state in the existing research.

Method used

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  • Test device and method of biaxial mechanical capability of ETFE (ethylene tetra fluoro ethylene) film
  • Test device and method of biaxial mechanical capability of ETFE (ethylene tetra fluoro ethylene) film
  • Test device and method of biaxial mechanical capability of ETFE (ethylene tetra fluoro ethylene) film

Examples

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Embodiment 1

[0052] Three ETFE single-layer circular air pillow models with an effective diameter of 1m, the thickness of the ETFE film sample is 250μm, and the inflation and pressure test is carried out at a room temperature of 25°C. The maximum inflation pressure of the test is 20kPa. Inflate. The air pressure-altitude curve at the top of the air pillow obtained through measurement and the calculated true stress-true strain curve are as follows: Figure 5 and Figure 6 As shown, among them, Figure 5 The abscissa is altitude, and the ordinate is air pressure. Figure 6 The middle abscissa is the true strain, the ordinate is the true stress, and the three curves represent three test models respectively.

Embodiment 2

[0054] Three ETFE single-layer circular air pillow models with an effective diameter of 1m, the thickness of the ETFE film sample is 250μm, and the inflation and pressure test is carried out at a room temperature of 25°C. The maximum inflation pressure of the test is 28kPa. Inflate. The measured air pressure-altitude curve at the top of the air pillow and the calculated true stress-true strain curve are as follows: Figure 7 and Figure 8 As shown, among them, Figure 7 The abscissa is altitude, and the ordinate is air pressure. Figure 8 The middle abscissa is the true strain, the ordinate is the true stress, and the three curves represent three test models respectively.

Embodiment 3

[0056] Three ETFE single-layer circular air pillow models with an effective diameter of 1m, the thickness of the ETFE film sample is 250μm, and the inflation and pressure test is carried out at a room temperature of 25°C. The maximum inflation pressure of the test is 17kPa, and the air pillow is slowly loaded by continuous loading Inflate. The measured air pressure-altitude curve at the apex of the air pillow and the calculated true stress-true strain curve are respectively Figure 9 and Figure 10 As shown, among them, Figure 9 The abscissa is altitude, and the ordinate is air pressure. Figure 10 The middle abscissa is the true strain, the ordinate is the true stress, and the three curves represent three test models respectively.

[0057] From the results of the analysis of the three embodiments, the repeatability of the present invention is better, and the material performance parameters obtained under the three-dimensional stress state of the ETFE film in different use...

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Abstract

The invention discloses a test device and method of biaxial mechanical capability of ETFE (ethylene tetra fluoro ethylene) film. The test device comprises a steel disc, a steel ring, an air pressure tester and a film surface height meter. During a test, the single layer of the ETFE film to be tested is clamped between the steel disc and the steel ring, forming a circular air cushion model; the ETFE film is inflated and pressurized via a valve core on the steel disc; the air pressure tester and the film surface height meter are used to measure the air pressure of a top point of the air cushion and the film surface height, and accordingly, equivalent true stress and strain of the ETFE film under biaxial stress is calculated. The material performance parameters of the ETFE films different in thickness under three-dimensional spatial stress are acquired through simple inflation of the circular air cushion; the test method is simple, and the meters are of high precision and high repeatability; the influence of the environmental factors, including temperature, humidity and the like, can be given to considerations according to usage conditions, and the influence of the single environmental factor upon the material performances can also be given to consideration.

Description

technical field [0001] The invention relates to the field of architectural design, in particular to a method for testing the bidirectional mechanical properties of ETFE films. Background technique [0002] ETFE (Ethylene Tetra Fluoro Ethylene) film is called ethylene-tetrafluoroethylene copolymer in Chinese. It is an organic polymer material that has both excellent properties similar to polytetrafluoroethylene and easy processing properties similar to polyethylene. Invented by DuPont Chemical Company in the 1970s, Victor Voytek was established by German Stephen Lenett, specializing in the design and manufacture of ETFE films and promoting them to construction companies around the world. After nearly 40 years of development and application, ETFE film has become a bright star in the field of building materials. [0003] At present, the test and analysis of the uniaxial tensile properties of ETFE films are relatively mature at home and abroad, and manufacturers are gradually e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/28
Inventor 崔家春杨联萍巫燕贞
Owner EAST CHINA ARCHITECTURAL DESIGN & RES INST