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A method for manufacturing a dumbbell-shaped micron fiber tensile sample with controllable gauge length
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A micron fiber and tensile sample technology, applied in the field of fiber tensile test, can solve the problems of low accuracy, inaccurate calculation of elongation in deformation zone, low material elongation and tensile strength, etc.
Active Publication Date: 2020-12-11
HARBIN INST OF TECH
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[0004] When the present invention directly tests the tensile mechanical properties of micron-scale fibers, stress concentration occurs at the clamping end, early fracture occurs, resulting in low elongation and tensile strength of the material, and inaccurate estimation of the length of the deformation zone, resulting in calculation of elongation For the problem of inaccuracy, it is proposed to use chemical / electrochemical corrosion methods to manufacture fiber tensile samples with controllable gauge length and uniform diameter of the gauge section, which solves the problem of direct testing of small-sized fibers for tensile strength and elongation. The test results are accurate low sex problem
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specific Embodiment approach 1
[0027] Specific Embodiments 1. In this embodiment, a chemical corrosion process is used to manufacture a dumbbell-shaped micron fiber tensile sample with controllable gauge length, and the processing object is NiTi fiber. Specifically, it is carried out according to the following steps:
[0028] Step 1. Clean the fiber with absolute ethanol for 3 minutes under the condition of ultrasonic power of 300W and frequency of 30KHz, remove the oil and dust on the surface, put it on a clean filter paper, put it in a drying box, and heat it at 50°C 5min, remove the organic solvent on the surface;
[0029] Step 2, using a corrosive agent to chemically corrode the middle part of the fiber;
[0030] Step 3. Then remove the corrosive agent, quickly wash with distilled water, and then use absolute ethanol to ultrasonically clean for 3 minutes under the condition of ultrasonic power of 300W and frequency of 30KHz. After heating for 5 minutes, a dumbbell-shaped micron fiber tensile sample is ...
specific Embodiment approach 2
[0039] Specific embodiment two, this embodiment adopts the electrochemical corrosion process to manufacture the dumbbell-shaped micron fiber tensile sample with controllable gauge length, and the processing object is graphene-reinforced aluminum-based composite fiber, specifically according to the following steps:
[0040] Step 1. Clean the fiber with acetone for 10 minutes under the condition of ultrasonic power of 400W and frequency of 35KHz to remove surface oil and dust, put it on a clean filter paper, put it in a drying oven, and heat it at 80°C for 5 minutes. Remove organic solvents from the surface;
[0041] Step 2, using a corrosive agent to perform electrochemical corrosion on the middle part of the fiber;
[0042] Step 3, then remove the corrosive agent, quickly wash with distilled water, and then use acetone to ultrasonically clean for 10 minutes under the condition of ultrasonic power of 400W and frequency of 35KHz, put it on a clean filter paper, put it in a dryin...
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Abstract
The invention discloses a manufacturing method of a dumbbell-shaped micron fiber tensile sample with a controllable gauge length, relating to an experiment method of fibrous tensile properties. The method aims at solving the problem that small-sized fiber is low in test result accuracy when used for directly testing tensile strength and elongation percentage. The method disclosed by the inventioncomprises the following steps: firstly, carrying out ultrasonic cleaning by using an organic solvent for fiber so as to remove greasy dirt and dust on a surface, placing the fiber on clean filter paper, and putting the fiber into a drying box to be heated; secondly, performing electrochemical corrosion or chemical corrosion on a middle part of the fiber by adopting a corrosive agent; and thirdly,then removing the corrosive agent, quickly cleaning by using distilled water, then carrying out ultrasonic cleaning by using the organic solvent, and placing the fiber on clean filter paper to be heated in the drying box. After treated by the method, the fibrous gauge length segment is uniform in diameter, the gauge length is controllable, the surface quality of the gauge length segment is good, and the transitional area of the gauge length segment and a clamping segment is smooth.
Description
technical field [0001] The invention relates to a fiber tensile test method, which belongs to a method for manufacturing a dumbbell-shaped micron fiber tensile sample with controllable gauge length. Background technique [0002] The test method of tensile mechanical properties is one of the basic methods of material performance testing. With the continuous development of science and technology, the demand for accurate testing of the tensile mechanical properties of micron-sized fiber samples is gradually increasing. The sample for the tensile test is usually in the shape of a dumbbell. Before the tensile test, the clamp clamps the part with a larger cross-sectional area (clamping section) at both ends of the sample, and the cross-sectional size of the middle gauge section is smaller than that of the clamping part. , so under the action of tensile stress, only the material within the gauge length range will be deformed; in addition, the clamping section and the gauge section...
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