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A high-frequency torsional fatigue test method and device for hard plastic parts

A hard plastic, torsional fatigue technology, used in measuring devices, analytical materials, instruments, etc.

Inactive Publication Date: 2016-01-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a fatigue testing method and device for hard plastic parts, to solve the problems of the above-mentioned fatigue testing machine and improve the testing efficiency

Method used

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  • A high-frequency torsional fatigue test method and device for hard plastic parts
  • A high-frequency torsional fatigue test method and device for hard plastic parts
  • A high-frequency torsional fatigue test method and device for hard plastic parts

Examples

Experimental program
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Effect test

example 1

[0061] The following are specific examples:

[0062] Place 4 standard splines of 80×10×4mm made of polypropylene between the upper fixture 21 and the lower fixture 23, adjust the temperature and humidity of the test to make it reach the standard state, turn on the power switch of the device, and set the working frequency to 3Hz, fatigue time is set to 48h. Obtain the fatigue characteristic curve as Figure 4 As shown, the ordinate is the internal stress of the spline, and the abscissa is the fatigue times. Points A, B, C, and D in the figure are 0, 1,000, 10,000, and 200,000 times respectively.

[0063] The following table shows the tensile strength of the spline before and after fatigue (in the table, A represents before fatigue, B represents after fatigue):

[0064] Table 1

[0065] sample Tensile strength (MPa) sample Tensile strength (MPa) A1 31.82 B1 26.37 A2 32.35 B2 27.03 A3 31.46 B3 26.52 A4 32.21 B4 26.74

example 2

[0067] The spline specification in embodiment 1 is changed into the standard spline of 125 * 13 * 13mm, according to the same operating method as in embodiment 1, obtain fatigue curve such as Figure 5 As shown, the ordinate is the internal stress of the spline, and the abscissa is the fatigue times. Points A, B, C, and D in the figure are 0, 1,000, 10,000, and 200,000 times respectively.

[0068] The following table shows the tensile strength of the spline before and after fatigue (in the table, A represents before fatigue, B represents after fatigue):

[0069] Table 2

[0070] sample Tensile strength (MPa) sample Tensile strength (MPa) A1 79.22 B1 63.85 A2 80.07 B2 63.67 A3 78.48 B3 64.44 A4 81.23 B4 65.19

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Abstract

The invention discloses a high-frequency torsional fatigue test device and a test method for hard plastic parts, comprising: a fixing device, multiple sets of fixture device units, a transmission unit, a torque and environment monitoring unit, a PLC unit, an angle and frequency control unit, drive unit and power supply unit. A plurality of hard plastic parts are respectively clamped on the fixture unit; the power supply unit provides power to the drive unit; the drive unit drives the transmission unit to reciprocate along the slide rail, driving the hard plastic sample loaded on the fixture unit The torque of the hard plastic parts and the temperature and humidity of the environment are collected by the torque and environment monitoring unit; the PLC unit receives the analog signal collected by the torque and environment monitoring unit, and outputs the fatigue curve. The invention can not only test multiple groups of samples at high frequency at the same time, but also can directly convert each parameter into a fatigue strength curve through the system and display it to the user, and supports real-time printing, which improves the test efficiency.

Description

technical field [0001] The invention relates to a fatigue testing device, in particular to a high-frequency testing device which can simultaneously test multiple groups of samples and simultaneously output fatigue curves. Background technique [0002] Fatigue testing machines currently on the market are mainly for testing metal materials, and a few fatigue testing machines for plastic materials are only multi-functional single-spline. There are very few simple and practical testing machines with a single function, multiple strips, and only torsion for materials such as plastics. Known fatigue testing devices generally can only test one sample at a time, and cannot directly reflect the fatigue curve of the object to be tested. Generally, several or even more tests are required to accurately reflect the fatigue characteristics of a test object. Therefore, for a general fatigue testing machine, it needs to be measured many times to test a test object, which is very time-consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/26
Inventor 朱新生刘中华王兴新苏公磊
Owner SUZHOU UNIV
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