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Method for measuring normal rigidity of large contact interface by completely considering plastic influence

A technology of contact interface and normal stiffness, applied in the field of laser scanning and measurement, to achieve the effect of breaking through the limitations of use

Inactive Publication Date: 2011-08-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method can fully include the influence of material plasticity and can measure the large contact interface

Method used

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  • Method for measuring normal rigidity of large contact interface by completely considering plastic influence
  • Method for measuring normal rigidity of large contact interface by completely considering plastic influence
  • Method for measuring normal rigidity of large contact interface by completely considering plastic influence

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Embodiment

[0048] In order to verify the method of the present invention: the method of measuring the normal stiffness of the large contact interface that fully takes into account the influence of plasticity, the existing direct loading measurement method and ultrasonic measurement method are used as comparison objects. Wherein, the numerical value of ultrasonic measurement method is obtained by the experiment that people such as Gonzalez-Valadez M, (see literature Gonzalez-Valadez M, Baltazar A, Dwyer-Joyce R S.Study of interfacialstiffness ratio of a rough surface in contact suing a spring model[ J].Wear, 2010,268:373-379); The numerical value of directly loading measurement method and the inventive method obtains by finite element simulation, and its model is as figure 1 shown. In order to make an effective comparison with the ultrasonic measurement method, the size and material of the two rough bodies are consistent, and one of the contact surfaces is a smooth plane. The relevant par...

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Abstract

The present invention discloses a method for measuring normal rigidity of a large contact interface by completely considering plastic influence. The method comprises the steps of adopting a contact system of two rough bodies as a measuring object and the complete equivalence of the system as a principle, using laser to mark three straight lines which fulfill the measuring requirement on the two rough bodies, and obtaining the normal rigidity of the contact interface by observing normal displacements of the three straight lines during a loading procedure. The method considers the influence of the contact interface shape degree on the normal contact rigidity on the basis of a prior method, and uses a simple and easy laser mark method to measure the normal rigidity of the large contact interface without being influenced by contact areas. Moreover, the method, which breaks using limits of the prior method, can be used not only in laboratories, but also in practical engineering conveniently.

Description

technical field [0001] The invention belongs to the technical field of laser scanning and measurement, relates to the dynamic equivalence of a system and the friction characteristics of a material, and in particular to a method for measuring the normal stiffness of a large contact interface which fully takes into account the influence of plasticity. Background technique [0002] With the rapid development of large-scale mechanical equipment such as high-precision machine tools, heavy-duty gas turbines, and launch vehicles, more and more attention has been paid to the accurate measurement of the stiffness of the contact interface in the structure, because the stiffness of the contact interface will affect the dynamic characteristics of these large-scale mechanical equipment. Significant impact. If the effect of damping is ignored, the contact interface can be equivalent to a homogeneous spring in essence, so the accurate equivalence of the contact system is the basis for accu...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/06
Inventor 刘恒刘意易军景敏卿陈丽
Owner XI AN JIAOTONG UNIV
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