Composite function film capable of measuring surface deformation and internal damage, and application method thereof

Abstract

The invention discloses a composite function film capable of measuring surface deformation and internal damage, and an application method thereof, and belongs to a damage measurement composite function film and the application method therefor. The function film consists of a thermal insulation layer and a measurement layer. The thermal insulation layer consists of a double-layer film, wherein the center of the double-layer film is provided with an air interlayer, and each layer of the double-layer film is formed by the mixing and laying of a material B. The measurement layer is made of materials A and B, and the materials A and B are laid layer by layer from the third layer to the fifth layer. The center of a contact surface of a first laying layer of the measurement layer with a hollow cylinder is provided with a plurality of flexible electrodes, and a conductive black - silicone rubber strip is disposed between the first laying layer and a second laying layer. The double silicone rubber film with the center being provided with the air interlayer can effectively reduce the heat conductivity coefficient, and achieves the improvement of horizontal temperature gradient control precision. The measurement layer employs a function gradient material idea to achieve the close gluing and synchronous deformation with the surface of a tested sample, and assists the plurality of flexible electrodes and conductive rubber strip, thereby completing the distribution measurement of a surface deformation field of the hollow cylinder and the internal resistivity in a temperature gradient direction.

Description

technical field [0001] The invention relates to a composite functional film for damage measurement and its use method, in particular to a composite functional film capable of measuring surface deformation and internal damage and its use method. Background technique [0002] In the indoor triaxial test, there are mainly two methods for observing the deformation field on the surface of the sample: contact measurement and non-contact measurement. A typical contact measurement method is the surface resistance strain sensor method, and a representative non-contact measurement method is the digital image method (DIP). In the contact measurement method, the quality of the adhesion between the resistance strain sensing unit and the surface of the soil or frozen soil material directly restricts the reliability of the measurement results. The interface effect between the two materials (sensing material and dielectric material) cannot be eliminated in the traditional pasting method, r...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite functional film capable of measuring surface deformation and internal damage and its use method, to solve the problem of the interface effect between the sensing unit material and the measured material, and to realize the measurement of the surface deformation field and internal damage field of the sample. Simultaneous measurement

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