Method for measuring interfacial shear strength under full plastic contact of discs and flat plate and device thereof

A technology of interfacial shear strength and contact surface, which can be applied to measurement devices, mechanical devices, instruments, etc., can solve the problems of measurement error and low measurement accuracy, and achieve the effects of high measurement accuracy, simple device structure and remarkable technical effect.

Inactive Publication Date: 2010-05-19
南通鼎强机械科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 3. The principle of the existing ball impact testing machine (see reference 3 for details) to measure the interface shear strength is the same as that of the double-disc testing machine, and it also has the defects of measurement error and low measurement accuracy in essence

Method used

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  • Method for measuring interfacial shear strength under full plastic contact of discs and flat plate and device thereof
  • Method for measuring interfacial shear strength under full plastic contact of discs and flat plate and device thereof
  • Method for measuring interfacial shear strength under full plastic contact of discs and flat plate and device thereof

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Embodiment

[0088] The plate is made of No. 45 steel, the contact surface is quenched, and the surface hardness is HRD1=2.0GPa. Flat contact surface roughness R a The value is 0.1 μm. The lubricating oil used is paraffin oil LVI260 (international brand).

[0089] 1. The disk is made of No. 20 steel, and the contact surface hardness is HRD2=0.3GPa. Disk contact surface roughness R a The value is 0.1 μm. The integrated Young's modulus of elasticity of the contact surface of the disc and the flat plate is E'=209GPa. The disk radius is 20mm, the disk (axial) thickness h=15mm, the width of the plate along the disk axis is 25mm, and the contact line length between the plate and the disk along the disk axis is 15mm. The sliding speed of the plate relative to the disc is u=4.0m / s, and the dimensionless rolling speed is uη a / (2E'R)=1.91E-11. The load applied between the disk and the plate is w 1 =6.0E+05N / m, that is, the dimensionless load applied between the disk and the plate is w 1 Wh...

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Abstract

The invention relates to a method for measuring interfacial shear strength under full plastic contact of discs and a flat plate, which comprises the following steps of: A, making a disc still and the flat plate slide with the speed mu relative to the disc, wherein the rolling-sliding ratio is 2; B, supplying measured lubricating oil to a linear contact area to ensure that the hydrodynamic pressure lubrication is formed in the linear contact area, and applying a load between the disc and the flat plate to ensure that the maximum hertzian contact pressure of linear contact is more than 0.4GPa; and C, needing two discs with different contact surface hardnesses if the single measurement is to be finished, performing the loading on contact surfaces of the two discs and the flat plane respectively, measuring friction coefficient values on contact surfaces of the discs or contact surfaces of the flat plate under loading contact of the two discs and the flat plate respectively, and solving a binary linear equation group about the friction coefficients of the contact surfaces to obtain ts0 and an alphas value. The adoption of the method and a device thereof has remarkable technical effect, and has the advantages of larger pressure range of the measured lubricating oil, simple and compact structure, easy realization, lower manufacturing cost and using cost, easy measurement, higher measurement accuracy and the like.

Description

technical field [0001] The invention relates to a method for measuring interface shear strength, in particular to a method for simultaneously measuring lubricating oil-contact surface interface shear strength and lubricating oil-contact surface interface shear strength-lubricating oil pressure under full plastic contact between a disc and a flat plate Method and apparatus for proportional coefficients. Background technique [0002] Shear strength refers to the ability of a material to withstand shear forces. A large number of experiments and engineering practices have shown that when mechanical parts are lubricated by hydrodynamic pressure, there is a shear strength at the interface between the lubricating oil and the contact surface of the part, which is lower than the shear strength of the lubricating oil. When the parts are lubricated by hydrodynamic pressure, the shear strength of the lubricating oil-contact surface interface plays a role and has an important influence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00G01N19/02
Inventor 张永斌
Owner 南通鼎强机械科技发展有限公司
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