Measuring method and device for fiber material transverse compression property

Abstract

The invention relates to a method and a device for measuring transverse compressive properties of fiber materials. There is a fiber transverse compression part, which uses the indenter on the cantilever beam to perform transverse compression on the single fiber or overlapping fiber samples in the polygonal disk; the fiber deformation observation part uses the objective lens settings in two directions to perform stereoscopic observation and measurement of the compressed fiber The compression stress measuring part with deflection correction inputs the stress change of the indenter into the calculator in real time during the compression process, and the deflection correction is to correct the vertical compression displacement by measuring the small deflection angular displacement of the cantilever beam during compression by laser small-angle reflection quantity. Since the compression measurement method of the present invention adopts combined in-situ measurement of stress and shape changes and compact and ingenious mechanism design, the measurement of fiber transverse compression shape is fast, accurate and comprehensive, and the measurement error is greatly reduced, which is suitable for various fiber materials.

Description

Technical field: [0001] The invention relates to a method and device for measuring transverse compressive properties of fibrous and tubular materials. More specifically, the present invention relates to a method and device for measuring transverse compressive properties of flexible fiber materials, belonging to the field of micro-measurement. Background technique: [0002] In the study of fiber materials, the measurement of the transverse compressive properties of fibers, especially the compressive properties of overlapping fibers, has important practical significance for the safety of the actual use of fiber products and structural design. appear particularly prominent. [0003] There are many studies on the axial tensile properties of fibers and fiber bundles, and some studies on axial compression (Yu Weidong, Liu Yuqing, Han Lu, Method and device for measuring fiber compression bending properties, Chinese invention patent, application number 200310109512.3) and the same ...

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Problems solved by technology

[0005] There are several difficulties in the measurement of fiber transverse compression properties: first, the transverse compression displacement of fibers is small, and how to accurately control and measure the small compression amount when the fiber diameter is generally 10-30 μm; second, not only the thickness of the fiber layer decreases during the compression process, but also the fiber How to observe biaxially (thickness and width) at the same time as the contact area increases; Third, in practical applications, the fibers are overlapped and arranged at a certain angle, so it is necessary to design and control samples with different overlapping angles in performance measurement. Accurate overlapping arrangement and observation

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