Membrane tension test method and device based on thin membrane resonance

Abstract

The invention discloses a membrane tension test method and device based on thin membrane resonance, which relate to the technical field of material mechanics experiments. The device is composed of three parts of measurement, a sound source and data acquisition and analysis. The test method mainly comprises the following steps: A, the measurement device is placed on the membrane of the membrane structure to form a test area with a fixed size; B, sound waves generated by the sound source device are used to excite the membrane in a non-contact mode, and the data acquisition and analysis system isadopted to test the membrane resonance frequency f1 and the corresponding formation band number m1 and n1 in the test area; C, the measurement device is rotated for 90 DEG to change the size of the test area, and the test is repeated to obtain a different frequency f2 and the corresponding formation band number m2 and n2; and D, according to a formula, data measured in two tests are substituted to obtain tension values of Tx and Ty per linear meter of the longitude-latitude two-direction membrane. According to the test method and the tester provided in the invention, membrane resonance is generated based on sound wave excitation, defects of directly measuring the membrane tension traditionally can be avoided creatively, and the measurement precision is good.

Description

technical field [0001] The invention relates to the field of material mechanics experiment technology and building structure material test technology, in particular to a field test method and corresponding device for membrane surface tension of a membrane structure based on thin film resonance. Background technique [0002] Polymer composite fabric film materials are used in modern architectural structures and industrial fields such as aviation and aerospace because of their light weight, high strength, chemical resistance and durability, such as architectural membrane structures, aviation airships, aerospace parachutes or soft landing systems Wait. The fabric film is generally composed of a base cloth and a coating. The base cloth is woven from polymer materials and synthetic fibers. In the field of construction, there are mainly polyester fibers, glass fibers, etc. In the field of aerospace, there are mainly polyethylene fibers, aromatic fibers, etc. Polyester fiber, nylo...

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Problems solved by technology

However, this estimation method is too subjective, and the accuracy is difficult to guarantee. The immaturity of the relaxation test technology limits the development and application of the membrane structure in a certain sense. Therefore, in order to make the membrane structure develop into a modern technology, it is necessary to accurately Quantitative evaluation of film pretension

[0008] The traditional methods and devices for quantitatively evaluating the surface stress of thin films mostly use the contact excitation method, which not only has poor economy and low practicability, but also has poor measurement accuracy. Especially for the separate tests of the respective stresses in the latitude and longitude directions, the accuracy is even more difficult to guarantee. , in actual engineering, the method of combining theory and experience is still used to measure

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