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A loading device and method for asymmetric cyclic loading of a test piece

A technology of cyclic load and loading device, which is applied in the direction of measuring device, application of repeated force/pulsation force to test material strength, instrument, etc., can solve the problems of changing the force impedance of the test piece, increasing the cost of the experiment, reducing the efficiency of the experiment, etc.

Active Publication Date: 2021-04-09
JILIN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: an additional static loading device is required, which increases the cost of the experiment; the connection between the end of the specimen and the static loading device will change the force impedance of the specimen and reduce the experimental efficiency

Method used

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  • A loading device and method for asymmetric cyclic loading of a test piece
  • A loading device and method for asymmetric cyclic loading of a test piece
  • A loading device and method for asymmetric cyclic loading of a test piece

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Embodiment Construction

[0035] Such as figure 1 , figure 2 As shown, it includes connecting column 1, upper specimen clamping end 2, upper catenary transition section 3, middle section 4, lower catenary transition section 5, lower specimen clamping end 6 and specimen mounting hole 7, Wherein the connecting column 1 is connected with the top of the clamping end 2 of the upper test piece, the clamping end 2 of the upper test piece is connected to the upper catenary transition section 3, the upper catenary transition section 3 is connected to the middle section 4, and the middle section The bottom of the section 4 is connected to the lower catenary transition section 5;

[0036] The connecting column 1, the upper specimen clamping end 2, the upper catenary transition section 3, the middle section 4, the lower catenary transition section 5, and the lower specimen clamping end 6 are coaxial to ensure that the mechanical vibration is only along the Longitudinal transmission to avoid the occurrence of la...

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Abstract

The invention relates to a loading device and method for asymmetrical cyclic loading of a tested piece, belonging to the field of ultrasonic loading. The connecting column is connected to the top of the clamping end of the upper test piece, the clamping end of the upper test piece is connected to the upper catenary transition section, the upper catenary transition section is connected to the middle section, and the bottom of the middle section is connected to the lower catenary line. The transition section is connected, and the lower catenary transition section is connected with the clamping end of the lower test piece, and the test piece installation hole is located in the lower interior of the connecting column. The advantage is that the structure is novel, the process is relatively small, easy to process, and the structure is stable, with good test performance and stability. It is suitable for different testing machines and realizes the adjustment range of cycle characteristics‑1

Description

technical field [0001] The invention relates to the field of ultrasonic loading in the field of engineering technology, in particular to an auxiliary device and method for loading and adjusting the initial prestress of a tested piece of an ultrasonic fatigue testing machine in a mechanical fatigue test. Background technique [0002] In the field of modern engineering, many important parts work under the action of alternating stress, and fatigue damage caused by alternating loads has become the main failure form of most parts. Due to the limitations of test equipment and test conditions, the range of stress cycles in traditional material fatigue test research is limited to 10 7 within times. However, in modern engineering, especially in the field of high-tech engineering, many engineering components work under the condition of small alternating load and high alternating frequency, and the number of alternating times these parts bear is much higher than 10 7 times, sometimes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32G01N3/62G01N3/02G01N3/04
CPCG01N3/02G01N3/04G01N3/32G01N3/62G01N2203/0005G01N2203/0055G01N2203/0423
Inventor 王昕张学成曹晓东张瀚冰李文权李群姜冬梅
Owner JILIN UNIV
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