High-frequency torsional fatigue testing method and device for hard plastic pieces
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A hard plastic, torsional fatigue technology, applied in the direction of measuring devices, analysis materials, instruments, etc.
Inactive Publication Date: 2013-04-03
SUZHOU UNIV
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[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
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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):
[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):
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Abstract
The invention discloses a high-frequency torsional fatigue testing device and a high-frequency torsional fatigue testing method for hard plastic pieces. The high-frequency torsional fatigue testing device comprises a fixing device, multiple groups of clamp device units, a transmission unit, a torsion and environment monitoring unit, a PLC (programmable logic controller) unit, an angle and frequency control unit, a driving unit and a power supply unit, wherein multiple hard plastic pieces are clamped on the clamp device units respectively; the power supply unit supplies power to the driving unit; the driving unit drives the transmission unit to do reciprocating motion along sliding rails to drive torsion of one end of each of the hard plastic test pieces loaded on each clamp device unit; torsions of the hard plastic pieces and environmental temperature and humidity are acquired by the torsion and the environment monitoring unit; and the PLC unit receives analog signals acquired by the torsion and the environment monitoring unit and outputs a fatigue curve. By the device and the method, multiple groups of test pieces can be tested at high frequency at the same time, parameters can be directly converted into a fatigue strength curve through a system and displayed to a user, real-time printing is supported, and the testing efficiency is improved.
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...
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