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Measuring method and device for twisting property of flexible material

A technology of torsional properties and flexible materials, which is applied in measurement devices, analysis materials, and material analysis by optical means. Effect

Inactive Publication Date: 2005-03-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the above that first, people still evaluate the torsional performance of some rigid or partially thick flexible materials; second, the torsional performance of flexible materials is more characterized by torque and torsional damage; third, it is suitable for The torsional performance of fiber materials is less evaluated
In particular, comprehensively study the characteristics of fiber materials under torsion (natural vibration, one-time torsional damage and repeated torsional fatigue), and record the twist transfer process during torsion, and flexible materials (fibers, yarns) under temperature control and wires, strip materials, etc.) torsion measurement methods and devices have not been reported

Method used

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  • Measuring method and device for twisting property of flexible material
  • Measuring method and device for twisting property of flexible material
  • Measuring method and device for twisting property of flexible material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1 Torsional natural vibration test

[0051] First, use the clip opener 54 to open the micro spring clip 53, clamp one end of the aramid fiber in the micro spring clip 53, then lift the other end of the aramid fiber, clip it in the upper chuck 51, and adjust the centering adjustment Device 22, align the fiber axis with the clamping center of the lower chuck, and clamp the micro spring piece 53 in the lower chuck 52, as attached figure 1 shown. At this time, a certain torque or rotation angle is applied by the rotating mechanism 6 connected with the lower chuck 52, and then the spring clip 52 is opened, and the moving plate 65 is moved down rapidly at the same time to ensure the self-vibrating torsional movement of the spring clip. And self-oscillating torsion can make the reflection mirror 41 of torque measurement mechanism 4 produce deflection, and the reflection point on the reflection mirror 41 is irradiated by laser source 44 changes, se...

Embodiment 2

[0052] Example 2 constant load single fiber torsional fatigue test result

[0053] Using the device of the present invention, the fiber sample is directly clamped between the upper chuck 51 and the lower chuck spring clamp 52, the pretension is applied through the displacement of the upper chuck 51 or the lower chuck 52, and the pretension is controlled by the tension sensor 21 The size is determined according to the fineness of the sample. The twist angle of the sample is determined by the number of positive and negative rotations of the rotating mechanism 6 connected to the lower chuck 52 . See attached figure 1 shown. In order to ensure that the size of the prestress is consistent and comparable, the size of the pretension is selected as 1.2, 1.5, 2cN / dtex, and the twist angle β=10°, 20° and 25°. The specific test results are shown in Table 1.

[0054] condition

Embodiment 3

[0055] The fracture twist angle α test result of embodiment 3 fiber

[0056] Using the operation method and device used in Example 2, the sample is clamped between the upper chuck 51 and the lower chuck spring clamp 52, and the reciprocating motor 64 is controlled to rotate in a single direction until the sample breaks, and the sample can be obtained by calculation fracture twist angle.

[0057] sample

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Abstract

The invention is a torsion property measuring method and apparatus for flexible material. The method is that upper end of simple holds to measure torsion moment and lower end hangs a weight to be revolved to a certain torsion moment or torsion angle then released to rotate back and reciprocate naturally, measuring autooscillation property and torsion modulus of the sample; or lower end is holded to have forced rotation or positive and negative, measuring once of the sample. The apparatus is consisted of moving beam, force, displacement sensor, torsion moment measuring mechanism, upper and lower holder, rotation mechanism, micro polarized light optical circuit and camera mechanism, moving and focusing mechanism, temperature cap, driving system and control circuit, program control and signal processing system, finishing measurement of self excited vibration, torsional fatigue and relaxation performance of flexible material with stationary load or stretch and observing degree of twist transfer of sample in and property change under different temperature, having simple but practical structure, convenient installation, many measurable parameters and accurate measurement.

Description

Technical field: [0001] The invention relates to precision measurement technology, and belongs to a measurement method and device for torsion performance in the field of flexible materials (fibers, yarns and threads, strip materials, etc.). Background technique: [0002] Among the mechanical properties of flexible materials, the tensile properties are mostly studied, including tensile fatigue, relaxation and creep properties. There are also some relatively mature research methods for the bending and compressive properties of flexible materials, but there are few studies on the corresponding torsional properties (including fatigue, natural vibration, relaxation and creep properties). The main reason is that the measurement method is relatively simple, there are difficulties in the corresponding test, and there is no ideal measurement device. However, the torsional properties of materials are extremely important in practical applications, such as fiber and rope processing and...

Claims

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Application Information

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IPC IPC(8): G01N3/26G01N21/00
Inventor 于伟东刘晓艳
Owner DONGHUA UNIV
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