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A Method for Determining the Normal Contact Stiffness of Loaded Joints Considering the Effect of Asperity Interaction on Rough Surface

A rough surface and contact stiffness technology, applied in the field of determining the normal contact stiffness of mechanical joints, can solve the problems of inaccurate calculation of the contact stiffness of the joint, achieve the advantages of scale independence, improve calculation efficiency, and high reliability Effect

Active Publication Date: 2020-06-16
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

Therefore, in the case of heavy load, the contact stiffness of the joint cannot be accurately calculated using the aforementioned theoretical method

Method used

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  • A Method for Determining the Normal Contact Stiffness of Loaded Joints Considering the Effect of Asperity Interaction on Rough Surface
  • A Method for Determining the Normal Contact Stiffness of Loaded Joints Considering the Effect of Asperity Interaction on Rough Surface
  • A Method for Determining the Normal Contact Stiffness of Loaded Joints Considering the Effect of Asperity Interaction on Rough Surface

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Embodiment

[0163] Taking two different rough surfaces as an example, the microscopic surface topography of the local regions of the two rough surfaces simulated by numerical software is as follows: figure 2 , image 3 shown. The material parameters of contact surface 1 are as follows: Elastic modulus E 1 =130Gpa, Poisson's ratio v 1 =0.3, yield strength σ y1 =300MPa, hardness H 1 =1200MPa; the material parameters of the contact surface 2 are as follows: elastic modulus E 2 =130Gpa, Poisson's ratio v 2 =0.3, yield strength σ y2 =260MPa, hardness H 2 =740 MPa. The normal load applied to the junction P=1×10 4 Pa.

[0164] Set the number of collection points to 500, and substitute the collected contour height data into the discrete structure function expression to draw the discrete structure function images of the two contact surfaces, and regression analysis in log-log coordinates can obtain the fitting curve The slope and intercept of , and its visualization results are as foll...

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Abstract

The present invention provides a method for determining the normal contact stiffness of a loaded joint by considering the interaction effect of rough surface asperities, which includes the following steps: measuring the microtopography data of the contact surface, and using a three-dimensional profile measuring instrument to obtain the contact at the joint Microscopic contour data of the surface, extract the position coordinates of each asperity vertex in the length direction, and simulate the asperity shape of the rough surface; establish the relationship between the normal load and contact stiffness; calculate the fractal parameters of the contact surface, and use the structure function Method, perform theoretical calculations on the extracted data to obtain its surface fractal dimension and scale coefficient; according to the above steps, substitute the values ​​of each material parameter into the final calculation of the normal contact stiffness of the joint. The present invention proposes a new method for determining the normal contact stiffness of the joint surface, which overcomes the shortcomings of the traditional method based on fractal theory of inaccurate calculation results under heavy load, has strong reliability, is close to the actual situation, and has a small amount of calculation. Improve computing efficiency and other advantages.

Description

technical field [0001] The invention relates to a method for determining the normal contact stiffness of a mechanical joint, in particular to a method for determining the normal contact stiffness of a loaded joint considering the influence of the interaction of asperities on a rough surface. Background technique [0002] The increasing development of industrial technology has put forward higher requirements for the precision and integration of machining equipment, and the further improvement of machining precision cannot be separated from the wide application of mechanical connection technology. As an important part of the overall stiffness of the mechanical structure, the contact stiffness of the mechanical joint has a very significant impact on the dynamic characteristics of large mechanical equipment. Studies by foreign scholars have shown that in ordinary lathes, the deformation of the sliding plate and the tool holder accounts for 40% of the total deformation of the mac...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 王润琼朱立达倪陈兵敦艺超史家顺于天彪巩亚东
Owner NORTHEASTERN UNIV LIAONING
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