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Measuring device for bending fatigue property of flexible material

A bending fatigue and measurement device technology, applied in the field of fatigue measurement, can solve problems such as unreported measurement technology, and achieve the effects of reasonable function, compact structure, and simple device components

Inactive Publication Date: 2006-06-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Measurement techniques for symmetrical, fixed-point bending fatigue of such flexible materials have not been reported

Method used

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  • Measuring device for bending fatigue property of flexible material
  • Measuring device for bending fatigue property of flexible material
  • Measuring device for bending fatigue property of flexible material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Constant Load Single Fiber Bending Fatigue Test Results

[0039] condition

[0040] It can be seen from the above table that under a small specific stress (less than 10% of the specific stress of fiber fracture) and a small rotation angle, the fiber bending fatigue failure has not reached the conventional use of 10%. 5 Fatigue life, indicating that although aramid fiber has high tensile strength, its resistance to bending fatigue is poor.

Embodiment 2

[0041] Example 2 Relaxation test of fibers

[0042] condition

[0043] By calculation, at a given elongation ε 0 =2%, the relaxation time τ of the fiber is 23.86h. Because the stress relaxation is a tensile characteristic, the fiber has better resistance to tensile fatigue.

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Abstract

The invention is a device for measuring bending fatigue of flexible materials, which is characterized in that it consists of a crank slider rack mechanism, force and displacement sensors, upper and lower chucks, a positioning gripper and an optical centering system, lifting and It consists of a rotating drive system, a control circuit, and a program control and signal acquisition system. It can effectively and accurately complete the measurement of fixed-point bending fatigue and relaxation creep properties of flexible materials under constant load or constant elongation. The measured characteristic indicators are fatigue fracture time, fatigue ultimate strength and ultimate strain, relaxation time, sample diameter or thickness, etc. The structure of the device is simple and practical, and the installation and replacement are convenient; there are many adjustable parameters, including the length of the sample, the position and spacing of fixed points, the bending rotation angle and angular frequency, the initial load or elongation, etc.; the measurement is accurate, and the movement of the action point during bending can be avoided. , The impact of the sample's offset and oscillation swing.

Description

Technical field: [0001] The patent of the present invention relates to fatigue measurement technology in the field of flexible materials (fiber, yarn, fabric and film materials, etc.). Background technique: [0002] Fatigue refers to the damage of materials under the action of long-term or repeated low stress. More specifically, fatigue refers to the damage or destruction of materials under the action of repeated stress or strain, or under the action of long-term static stress or constant strain, Damage and destruction caused by creep or relaxation of materials. The evaluation of fatigue damage and fatigue life should be considered corresponding to the given fatigue action mode, such as tension, bending, torsion, compression, or composite action. [0003] The study of fatigue originally started in the field of metal materials. The German A.Wohler et al. first conducted research in this area, pointing out that some metals have fatigue limits, and drawing the fatigue test res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/20G01N3/00G01N19/00
Inventor 于伟东刘晓艳
Owner DONGHUA UNIV
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