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Method and device for measuring interfacial shearing strength under the connection of disc and flat plate

A technology of interface shear strength and elastic contact, applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problems of measurement error and low measurement accuracy, and achieve high measurement accuracy, simple device structure, manufacturing cost and use cost low effect

Active Publication Date: 2010-05-05
JIANGSU FEIER ELECTRICAL TECH
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  • Summary
  • 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 and device for measuring interfacial shearing strength under the connection of disc and flat plate
  • Method and device for measuring interfacial shearing strength under the connection of disc and flat plate
  • Method and device for measuring interfacial shearing strength under the connection of disc and flat plate

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Embodiment

[0080] Both the disk and the plate are made of No. 45 steel, and the contact surfaces are all quenched, and the surface hardness reaches HRC50-53, HRD≈2.0GPa. The contact surfaces of the disk and the plate are finely ground, and the surface roughness is R a The values ​​are all 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 lubricating oil used is paraffin oil LVI260 (international brand), the radius of the disc is 20mm, the thickness of the disc (axial) h=15mm, the width of the flat plate along the axial direction of the disc is 25mm, and the flat and disc along the axial direction of the disc The contact wire length 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.

[0081] 1. When the load applied between the disk and the plate is w 1 =3.0E+05N / m, that is, the dimensionless load applied between the disk and ...

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Abstract

The invention relates to a method and a device for measuring interfacial shearing strength under the connection of a disc and a flat plate. The method comprises the following steps: A, the flat plate slides relative to the static disc at a speed u, with the slide-roll ratio being 2; B, the measured lubricating oil is fed to a line contact area, so as to form the hydrodynamic lubrication in the line contact area, and load is applied between the disc and the flat plate to ensure that the maximum Hertzian contact pressure of the line contact is larger than 0.4GPa; and C, the friction coefficients of the contact surface of the disc or the flat plate under the load are measured twice, and the binary linear equations for the friction coefficients of the contact surface are solved. By using the method and the device, the invention has significant technical effect and has the advantages of larger pressure measurement range of lubricating oil, simple and compact structure, easy implementation, lower manufacturing and servicing cost, easy measurement and higher measurement accuracy; moreover, the device of the invention is capable of measuring the shearing strength parameters of two interfaces at the same time, therefore, the invention is of significant practical value. The device of the invention can substitute for the high-pressure chamber measurement device and other measurement devices.

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 ratio under atmospheric pressure under elastic contact between a disc and a flat plate Coefficient methods and their devices. 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 impor...

Claims

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Application Information

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IPC IPC(8): G01N19/00G01N19/02
Inventor 张永斌
Owner JIANGSU FEIER ELECTRICAL TECH
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