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Method and devide for measuring orthotropic membrane structure elastic modulus

An orthotropic membrane, elastic modulus technology, applied in the direction of using a single impact force to test the strength of materials, can solve the problems of inability to measure the elastic modulus of the membrane structure, the elastic modulus is not accurate enough, the strain is not accurate enough, etc., to achieve effective The effect of the measurement method

Inactive Publication Date: 2015-12-09
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The two methods are relatively intuitive, but since the strain gauge needs to be attached to the surface of the membrane to measure the strain of the membrane during the test, and the main force-bearing part of the membrane is the base cloth of the membrane, the strain gauge is attached to the membrane. The coating on the surface of the membrane material makes the measured strain not truly reflect the strain of the membrane base fabric of the main force-bearing part
Therefore, the strain measured by the two methods is not accurate enough, so the final elastic modulus is not accurate enough
At the same time, the single tensile test method cannot measure the elastic modulus in the two directions at the same time; the two-way tensile test method also needs to go through a complicated derivation process to obtain the elastic modulus in the two directions
In addition, the unidirectional and bidirectional tensile methods cannot measure the elastic modulus of the built membrane structure.

Method used

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  • Method and devide for measuring orthotropic membrane structure elastic modulus
  • Method and devide for measuring orthotropic membrane structure elastic modulus
  • Method and devide for measuring orthotropic membrane structure elastic modulus

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Embodiment Construction

[0097] The theoretical model of the method for measuring the elastic modulus of the orthotropic membrane structure of the present invention is based on actual engineering. The basic principle is: use an incident velocity as v 0 The small ball of is vertically incident on the midpoint of a stretched film surface with a fixed boundary, causing the film surface to be displaced, and the maximum value of the displacement is measured f max . Then set the incident velocity to v 0 and displacement f max The two-way elastic modulus of the orthotropic membrane structure is obtained by substituting the measured theoretical formula. Theoretical derivation is based on the theory of large deflection of thin film and the principle of conservation of momentum. The theoretical calculation model of the measurement is as figure 1 shown.

[0098] The governing equations for the nonlinear large-deflection free vibration of an orthotropic film are obtained from the large-deflection theory of ...

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Abstract

The present invention discloses a method and a device for measuring orthotropic membrane structure elastic modulus, by research and analysis of orthotropic membrane mechanical characteristics, a new method for measuring the orthotropic membrane structure elastic modulus is provided, a measurement theoretical formula is deduced, then the theory correctness can be o verified by experiments, and finally the measuring device applied to engineering practices can be made. The method can be directly applied to measuring of orthotropic and homogeneous membrane elastic modulus, and is a simple and effective measurement method.

Description

technical field [0001] The invention belongs to the technical field of material mechanics parameter testing, and in particular relates to a method and a device for measuring the elastic modulus of an orthotropic membrane structure. Background technique [0002] Orthotropic membrane materials are mainly used in building structures, electronics industry, bioengineering and other fields. Especially in the field of building structures, the vast majority of membrane materials used in architectural membrane structures are fabric membranes. The fabric membrane is composed of a base fabric and a coating on the surface. The base fabric of the fabric membrane is interwoven with orthogonal warp and weft threads, and exhibits strong orthotropic properties in terms of mechanical properties, that is, the mechanical parameters such as elastic modulus and Poisson's ratio in the two directions are different. The rigidity of the architectural membrane structure is achieved by applying pre-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/30
Inventor 刘长江阳小燕祁勇敖仪斌曾宇星郑霞杨少朋青云杰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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