A device for testing the tangential stiffness of the contact interface under cyclic loading based on piezoelectric actuators

A technology of piezoelectric actuators and contact interfaces, applied in the testing of machines/structural components, measuring devices, testing of elasticity, etc.

Active Publication Date: 2021-08-20
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there are few literatures on the tangential stiffness of the sphere through experiments. In 2015, Maegawa proposed a simple measurement method of tangential stiffness based on the optical method, which can be used to measure the spatial distribution of the real contact area in the apparent contact area. observed, but this method can only be used for the analysis of static contact

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  • A device for testing the tangential stiffness of the contact interface under cyclic loading based on piezoelectric actuators
  • A device for testing the tangential stiffness of the contact interface under cyclic loading based on piezoelectric actuators
  • A device for testing the tangential stiffness of the contact interface under cyclic loading based on piezoelectric actuators

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Embodiment Construction

[0023] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0024] Application of cyclic load on the actuating part:

[0025] The upper and lower ends of the piezoelectric actuator 15 are respectively connected to the adapter 16 and the movable horizontal plate 6 through threads. The upper end surface of the adapter 16 is processed with arc grooves, and the lower end surface of the top tightening bolt 1 is processed with blind holes. When the bolt 1 is tightened, the steel ball 17 is clamped between the tightening bolt 1 and the adapter 16. At this time, the upper end of the piezoelectric actuator 15 is pushed to death. When a voltage is input to it, the piezoelectric actuator 15 The lower end of the lower end will hit the corresponding force downwards to hit the movable horizontal plate 6 and the movable test piece 14. The linear bearings 5 ​​at both ends are set o...

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Abstract

The invention belongs to the technical field of mechanical testing equipment, and provides a device for testing the tangential stiffness of a contact interface under a cyclic load based on a piezoelectric actuator. The invention proposes a testing machine structure capable of testing the tangential stiffness of the contact interface under cyclic loading. The design uses a piezoelectric actuator to apply a lateral load of a certain magnitude, and the input voltage of the piezoelectric actuator is controlled to control the generation of The transverse load of equal magnitude is input through the rebound force of the spring. Different from the existing tangential stiffness that can only be tested under static contact, the present invention can provide a cyclic load with a determined amplitude, and can feedback the dynamic tangential force of the contact interface through a force sensor, and the laser displacement sensor can feedback the contact interface. Dynamic displacement to determine the dynamic tangential stiffness of the contact interface. In addition, it can meet the test of test pieces of different sizes.

Description

technical field [0001] The invention belongs to the technical field of mechanical test equipment, and relates to a contact interface tangential stiffness test device under cyclic load based on a piezoelectric actuator. Background technique [0002] A large number of contact interfaces exist in the mechanical structure, so that the mechanical structure or system no longer has continuity. Under the action of external load, the slippage of the connecting contact interface will cause the nonlinear change of the local stiffness and have an important impact on the structural response, and then affect the dynamic characteristics of the overall structure. Therefore, the connection problem of the contact interface is an important basic problem in the study of mechanical systems, and the experimental research and modeling of stiffness characteristics is the key problem to be solved in the transition from single-space analysis to system analysis in mechanical dynamics, and it is also t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M5/00
CPCG01M5/0075
Inventor 孙清超郭钢毅袁志伟张先连赵斌斌
Owner DALIAN UNIV OF TECH
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