Multifunctional mechanical tension and compression fatigue loading device and method

Abstract

The invention relates to a multifunctional mechanical tension and compression fatigue loading device and method. The multifunctional mechanical tension and compression fatigue loading device comprises a power source main shaft, a test piece loading connecting member, a dual eccentric wheel mechanism, a tension piece and an elastic tension and compression connecting rod mechanism, wherein the elastic tension and compression connecting rod mechanism comprises a pressure connecting rod, an elastic element, a counter-force casing and dual loading inserting lugs. The method comprises the following steps of: rotating a secondary eccentric wheel; adjusting the position of an eccentric shaft of the secondary eccentric wheel according to the requirement and then locking the secondary eccentric wheel with a main eccentric wheel; starting a power source; sequentially adjusting the expansion amount of the elastic element through the main eccentric wheel, the secondary eccentric wheel, the tension piece and the pressure connecting rod; and rotationally adjusting nuts and further tuning the expansion mount of the elastic element to meet the loading requirement of the test piece. According to the multifunctional mechanical tension and compression fatigue loading device and method disclosed by the invention, the load error caused by wear of a structural element and mechanical clearance can be greatly reduced and the higher-precision repeated fatigue loading of the structural element is realized.

Description

Technical field [0001] The invention relates to a mechanical tension and compression multifunctional fatigue loading device and a method thereof, belonging to the field of structural experimental mechanics. Background technique [0002] In aviation, navigation, transportation, roads and bridges, construction, and port engineering structures, beams and elastic elements of various materials are typical stress-bearing components. They are all under repeated stress conditions under various environments for a long time. Therefore, this type of component Fatigue strength in various environments is an important research topic in structural mechanics. Especially in the design of modern engineering structures, it is necessary to study the strength of components under complex environments and loads. There is an urgent need to implement such loads and environmental conditions in the laboratory to assess the fatigue strength of components, and to do a good job for the next theoretical establ...

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Problems solved by technology

[0003] For a long time, it has been very difficult to achieve low-cost fatigue testing for this type of components

At present, it can be realized by hydraulic servo fatigue testing machine, but because these equipment are expensive, they have strict requirements on the use environment, and high energy consumption and long-term use require high test costs

[0004] Some current mechanical fatigue test loading devices simply adopt displacement control loading, so within the elastic range, the component deformation is small, and the accuracy of the load is completely realized by the displacement accuracy, coupled with the wear of the equipment during the fatigue test, so The accuracy requirements of the test load cannot be guaranteed, resulting in poor test results, especially for small-sized test pieces

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