Method for measuring interfacial shear strength under full plastic contact of discs and flat plate and device thereof
A technology of interface shear strength and contact surface, applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problems of low measurement accuracy and measurement error, and achieve high measurement accuracy, simple device structure, low manufacturing cost and low cost of use. low cost effect
Inactive Publication Date: 2014-02-26
南通鼎强机械科技发展有限公司
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[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
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[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 disc is made of No. 20 steel, and the contact surface hardness is HRD2 = 0.3GPa. Disc contact surface roughness R a The value is 0.1 μm. The comprehensive Young's modulus of elasticity of the contact surface of the disc and the flat plate is E'=209GPa. The radius of the disc is 20mm, the thickness of the disc (axial) h=15mm, the width of the plate along the disc axis is 25mm, and the length of the contact line between the plate and the disc along the disc 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 disc and the plate is w 1 =6.0E+05N / m, that is, the dimensionless load applied between the disc and t...
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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 the interface shear strength, in particular to a method for simultaneously measuring the lubricating oil-contact surface interface shear strength and lubricating oil-contact surface interface shear strength-lubricating oil pressure under atmospheric pressure under full plastic contact between a disc and a flat plate The method and device of proportional coefficient. Background technique [0002] Shear strength refers to the ability of a material to withstand shear forces. A large number of experiments and engineering practices show that when mechanical parts are in hydrodynamic lubrication, 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 under hydrodynamic pressure lubrication, the shear strength of the lubricant-contact surface interface plays a role and has an importa...
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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