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Ultrahigh shear strain rate lubricating grease rheological model

A rheological model and grease technology, applied in the direction of flow characteristics, flow characteristics of non-Newtonian fluids, measuring devices, etc., can solve the problem that rheological characteristics have no reference significance, and achieve high accuracy, convenient construction and high applicability Effect

Active Publication Date: 2017-05-31
QILU UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Existing rheological measurements and rheological models For high-speed bearings, shear strain rates range from 10 4 to 3.5×10 6 the s -1 The rheological properties have no reference significance

Method used

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  • Ultrahigh shear strain rate lubricating grease rheological model
  • Ultrahigh shear strain rate lubricating grease rheological model
  • Ultrahigh shear strain rate lubricating grease rheological model

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] The rheological model of ultra-high shear strain rate lubricating grease of the present invention is

[0027] The calculation formulas of parameters a, n and b are as follows:

[0028] a=3.079×10 -9 P 0 1.2586 (η 0 U / ER) -0.7801

[0029] n=0.8542 (P 0 / E) 0.0558 (η 0 U / ER) -0.0533

[0030] b=1.5879×10 -19 P 0 2.0355 (η 0 U / ER) -1.5738

[0031] P 0 is the maximum Hertz contact stress, E is the equivalent elastic modulus, E 1 ,E 2 are the elastic modulus of the two contact parts, such as balls and discs, E=E 1 E. 2 / (E 1 +E 2 ), R is the equivalent radius, R 1 and R 2 are the radii of the two contacts, R=R 1 R 2 / (R 1 +R 2 ), η 0 It is the kinemat...

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Abstract

The invention discloses an ultrahigh shear strain rate lubricating grease rheological model. The formula is shown in the description. The model is convenient to construct, parameters on which the model is based are easy to obtain, the model is measured on an ultrahigh shear train rate rheometer, and it is verified that the model has high precision and is especially suitable for rheological data with the shear strain rate from 0 to 3.5*106 s<-1> and even higher. The model has high applicability, and is suitable for solving lubricating grease shear strain between any two contact parts rolling relatively and sliding. After the model is built, the model can be used for solving the friction force of lubricating grease integrally, and the friction force of the lubricating grease is an important parameter necessary for lubricating grease research and development and bearing design. The model has high applicability especially on complex lithium-based grease.

Description

technical field [0001] The invention relates to the technical field of lubricating grease performance measurement, in particular to a rheological model of ultra-high shear strain rate lubricating grease. Background technique [0002] The ability of grease to flow and deform under external force is called the rheological properties of grease. Because grease is a non-Newtonian fluid, its rheological properties are complex. With the development of science and technology, the problem of improving the motion accuracy and life of high-speed bearings is becoming more and more urgent. The rheological characteristics of grease determine the friction characteristics of high-speed bearings, which in turn affects the life of the bearings and the accuracy of bearing movement. Therefore, it is of great significance to study the rheological properties of high-speed bearing grease. It is well known that when a shear force is applied to a grease, the grease composite fiber structure reori...

Claims

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Application Information

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IPC IPC(8): G01N11/00
CPCG01N11/00G01N2011/0026
Inventor 王燕霜刘跃龙李少川盛排排
Owner QILU UNIV OF TECH
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