A three-dimensional fractal prediction method for the normal contact stiffness of a bifractal joint surface
A technology of contact stiffness and prediction method, which is applied in image data processing, special data processing applications, instruments, etc., and can solve problems such as insufficient normal contact stiffness of bi-fractal bonding surfaces
Active Publication Date: 2019-03-08
NORTHEASTERN UNIV
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[0005]
The technical problem to be solved in the present invention is to provide a three-dimensional fractal prediction method for the normal contact stiffness of a bifractal joint surface for the deficiencies of the above-mentioned prior art; this method can better predict the normal contact stiffness of a bifractal joint surface, Solve the problem that the existing method based on fractal theory is insufficient to calculate the normal contact stiffness of the bifractal joint surface
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[0095] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0096] In this embodiment, a bifractal mechanical joint surface is taken as an example, and the normal contact stiffness of the joint surface is calculated using the three-dimensional fractal prediction method for the normal contact stiffness of the bifractal joint surface of the present invention.
[0097] Such as figure 1 As shown, the method of this embodiment is as follows.
[0098] A three-dimensional fractal prediction method for the normal contact stiffness of a bifractal joint surface, comprising the following steps:
[0099] Step 1: Obtain the three-dimensional morphology parameters of the asperities on the surface of the joint surface: obtain the fractal dimens...
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The invention provides a three-dimensional fractal prediction method for the normal contact stiffness of a bifractal joint surface, which relates to the technical field of mechanical joint surfaces and includes obtaining fractal dimension and scale coefficient of two rough surfaces of bifractal joint surface; 2 calculating a boundary contact area a12, an elastic critical contact area ac1, and an elastic critical contact area ac2 of a single micro-convex body on an equivalent bifractal rough surface of that joint surface; 3 calculating an elastoplastic partition and an area distribution densityfunction of a micro-convex body on an equivalent bifractal rough surface of that joint surface; 4 establishing a relationship between that total normal load on the joint surface and the contact areaof the joint surface; 5 establishing a relationship between that total normal contact stiffness of the joint surface and the contact area of the joint surface, and obtaining the total normal contact stiffness Kn of the joint surface. This method can better predict the normal contact stiffness of the bifractal interface, and solve the problem that the existing methods based on fractal theory are not enough to calculate the normal contact stiffness of the bifractal interface.
Description
technical field [0001] The invention relates to the technical field of mechanical joint surfaces, in particular to a three-dimensional fractal prediction method for the normal contact stiffness of a bifractal joint surface. Background technique [0002] Many thermomechanical equipment such as engines are assembled by many parts in a certain way according to certain functional requirements. The parts where these mechanical parts contact each other are called mechanical joint surfaces, referred to as joint surfaces. When the joint surface is under the action of external load and the heating conditions between parts change, friction and thermal stress will inevitably occur between the joint surfaces. Prediction combined with surface contact stiffness is of great benefit to improving the reliability, efficiency and service life of thermomechanical equipment such as engines. [0003] For the research on the normal contact stiffness of the bonding surface, on the basis of the cla...
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IPC IPC(8): G06F17/50G06T17/00
CPCG06T17/00G06F30/20Y02T90/00
Inventor 薛棚升朱立达宁晋生黄绪杰王玉莲阚德广
Owner NORTHEASTERN UNIV