Mechanical fatigue tester for test piece, and its testing method
A fatigue testing machine and fatigue testing technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems that the specimen cannot be applied with prestressed stress waveform, the response of the test termination command is slow, and the output load range is small. Achieve the effects of simple structure, low processing requirements and wide loading range
Active Publication Date: 2012-06-27
HOHAI UNIV
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Problems solved by technology
However, in the past mechanical fatigue testing machines, the judgment conditions for the end of the test are complicated, the response to the test termination command is slow, and the output load range is small, and the prestress cannot be applied to the specimen to adjust the stress waveform.
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[0020] The accompanying drawings disclose, without limitation, the structural schematic diagrams of the preferred embodiments involved in the present invention; the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0021] The invention discloses a fatigue test method for a test piece, which comprises the following steps: (1) fixing one end of the test piece, setting the other end with a cantilever, and applying elastic prestress to the cantilever end of the test piece; (2) fixing the cantilever end of the test piece At the same time, through the conductive element installed on the test piece, the moment of the fatigue crack limit of the test piece is measured to control the load application time. In addition, the stress monitoring device installed on the test piece is used to monitor the test piece under load. time stress changes. Further, a fatigue test method for a mechanical specimen includes the f...
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The invention discloses a mechanical fatigue tester for test piece, and a testing method of the tester. The tester comprises a frame, a test piece and a stress monitoring device for monitoring stress change of the test piece. The test piece has one end fixed with the frame and the other end arranged as a cantilever, and the cantilever end of the test piece is connected with the frame via an eccentric vibration exciter. The eccentric vibration exciter includes a rotation mechanism, an eccentric block connected with the output shaft of the rotation mechanism via a long connection stem, and an elastic connection member. The rotation mechanism is fixed with the test piece, the power supply circuit of the rotation mechanism is connected in series with a conductive element which feeds back the test piece generated fatigue crack limit to stop working of the eccentric vibration exciter, the conductive element is mounted on the test piece, and the elastic connection member has one end connected with the test piece and the other end connected with the frame. As a result, the invention has little consumption in the testing process, convenient operation, wide loading range, and high testing precision, can dynamically monitor stress, and has low processing requirements for test samples.
Description
technical field [0001] The invention relates to a fatigue test device, which belongs to the fatigue test field of material structure performance test. Background technique [0002] In engineering practice, many materials or components are subjected to dynamic loads in practical applications. Unlike when subjected to static loads, these materials or components often undergo fatigue failure suddenly without significant deformation in advance, which affects the structure. Safety performance has a major impact. With the increasing research on the fatigue performance of materials, the types and functions of fatigue testing machines are increasing to meet the needs of fatigue testing of different materials. Fatigue testing machines mainly include hydraulic servo type, electromagnetic type and mechanical type. Among them, the hydraulic servo fatigue testing machine is a relatively advanced testing device, but the price is high, and the power consumption is high and the cost is hi...
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IPC IPC(8): G01N3/08
Inventor 吉伯海前野裕文刘荣傅中秋陈策田圆
Owner HOHAI UNIV