Fiber-reinforced materials bending fatigue test method

A fiber-reinforced material, bending fatigue technology, used in the analysis of materials, the use of repetitive force/pulse force to test the strength of materials, measurement devices, etc. Small test force value and other problems to achieve the effect of solving the problem of control accuracy

A fiber-reinforced material, bending fatigue technology, used in the analysis of materials, the use of repetitive force/pulse force to test the strength of materials, measurement devices, etc. Small test force value and other problems to achieve the effect of solving the problem of control accuracy

CN105928810BActive Publication Date: 2018-11-30JUSHI GRP CO
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  • Fiber-reinforced materials bending fatigue test method
  • Fiber-reinforced materials bending fatigue test method
  • Fiber-reinforced materials bending fatigue test method

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Embodiment 1

[0035] refer to figure 1 , fiber-reinforced material bending fatigue test method, described method comprises the steps:

[0036] S1. Test the basic parameters and determine the test conditions: the test frequency is 3~5Hz; the stress ratio R between the maximum stress and the minimum stress selected for the test is 10; the test cycle waveform is set as a sine wave; the test environment is in accordance with the standard environmental conditions. The environmental conditions are temperature 23±2℃, relative humidity 50±10%;

[0037] The sample to be tested is conditioned for more than 24 hours under standard environmental conditions and tested under standard environmental conditions;

[0038] S2. Adjust the test span: according to the ISO 14125 static bending test method, adjust the thickness of the sample to be tested to be 20 times the span of the bent lower support;

[0039] S3. Set up the test compensation channel: First, perform the bending performance test on the static ...

Embodiment 2

[0052] refer to figure 1 , fiber-reinforced material bending fatigue test method, described method comprises the steps:

[0053] S1. Test the basic parameters and determine the test conditions: the test frequency is 3~5Hz; the stress ratio R between the maximum stress and the minimum stress selected for the test is 10; the test cycle waveform is set as a sine wave; the test environment is in accordance with the standard environmental conditions. The environmental conditions are temperature 23±2℃, relative humidity 50±10%;

[0054] The sample to be tested is conditioned for more than 24 hours under standard environmental conditions and tested under standard environmental conditions;

[0055] S2. Adjust the test span: according to the ISO 14125 static bending test method, adjust the thickness of the sample to be tested to be 20 times the span of the bent lower support;

[0056] S3. Set up the test compensation channel: First, perform the bending performance test on the static ...

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Abstract

The invention discloses a bending fatigue testing method of a fiber reinforced material, comprising the following steps: step S1 of testing basic parameters and determining test conditions; step S2 of adjusting a test span; step S3 of setting a test compensation path; step S4 of determining the maximum stress; step S5 of carrying out a plurality of stress level tests to obtain a bending performance test and a stress-strain curve, finding dependent variables of corresponding stress values by means of getting points, and calculating a deflection value of strain corresponding to each stress based on a deflection value calculation formula; step S6 of setting test stress parameters; step S7 of carrying out bending fatigue tests at different times; and step S8 of linear fitting: drawing an S-N curve of test values by means of a regression linear analysis based on the test result in the step S7 by taking N as a vertical coordinate and S as a horizontal coordinate, and fitting out a fitted equation of log10(stress)=a-blog10(times) or (stress)=a*(times)<(-b)> based on the S-N curve. The bending fatigue testing method of the fiber reinforced material disclosed by the invention provides a method evidence for a bending fatigue test of the fiber reinforced material, and fatigue test life can be quickly obtained by the fitted equation.

Description

technical field [0001] The invention relates to a bending fatigue test method of fiber reinforced material. Background technique [0002] At present, the known test standards for bending fatigue resistance in the field of fiber reinforced materials have not been systematically and comprehensively introduced, and the well-known GB / T 16779 and ISO 13003 fatigue test methods have not introduced the test for bending fatigue. [0003] Compared with tension-tension fatigue, the test force value of bending fatigue is very small, and at the same time, the bending fatigue test of fiber reinforced materials cannot effectively control the dynamic force value of bending fatigue in the current relevant fatigue testing machine. [0004] Currently, there is no applicable method standard for bending fatigue specimens of reinforced fiber materials, and it is usually only a deduction test carried out under the commonly used fatigue test methods of GB / T 16779 and ISO 13003. This application i...

Claims

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Application Information

Patent Timeline
30 Nov 2018
Publication
CN105928810B
IPC
G01N3/32
CPC
G01N3/32; G01N2203/0005; G01N2203/0023; G01N2203/0073
Inventors
张志坚; 崔峰波