Method for detecting tensile breaking force of polyacrylonitrile-based carbon fiber cloth

Abstract

The invention provides a method which can be implemented in a laboratory, is simple and feasible to operate and used for detecting the tensile breaking force of polyacrylonitrile-based carbon fiber cloth. The method comprises the following steps: 1, taking a sample, namely, cutting a plurality of warp-direction samples in a direction which serves as a sample length direction and is parallel to the direction of warps, and cutting a plurality of weft samples in a direction which serves as a sample length direction and is parallel to the direction of wefts; 2, treating the samples, namely, respectively intensifying the clamping sections of the wrap samples and the weft samples, uniformly coating an adhesive on the clamping sections of the samples in intensification treatment, putting the samples subjected to the adhesive coating treatment in an experiment environment to adjust the moisture content, and drying the adhesive; and 3, performing tensile experiment, clamping coated parts of the samples by using plate clamps on a testing machine, drawing the test samples at a constant speed until the samples are broken, recording the maximum force exerted when the samples are broken, respectively detecting the wrap samples and the weft samples so as to obtain multiple groups of data, and taking the average values of the data, thereby obtaining the wrap and weft tensile breaking forces of the carbon fiber cloth.

Description

technical field [0001] The invention relates to a detection method for carbon fiber cloth, in particular to a detection method for tensile fracture strength of polyacrylonitrile-based carbon fiber cloth. Background technique [0002] Carbon fiber cloth is widely used in the reinforcement and repair of building structures. In recent years, it has been increasingly used in the automotive industry as a friction material. As an important acceptance index for entering the factory, there is no national standard for the detection of its tensile breaking strength performance. QJ2525-93 "Technical Conditions for Acceptance of High Modulus Plain Carbon Fiber Cloth" refers to QJ2100 "Test Method for Breaking Strength and Elongation at Break of Carbon Fiber Cloth for Special Industrial Use", but this standard has been invalidated, and there is nowhere to find the specific content; carbon fiber cloth production enterprises Sign dedicated technical agreements with respective users, the m...

AI Technical Summary

Problems solved by technology

[0003] In order to ensure the stability of carbon fiber cloth products and solve the problem of tensile fracture strength entering the factory, different sample production methods and fixtures are used in the existing methods, which are complicated to operate and inaccurate test results.

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