Method for measuring interface shear strength under elastoplastic contact of disk and slab and device thereof

An interfacial shear strength, elastic-plastic technology, which can be used in measuring devices, using stable shear force to test material strength, using mechanical devices, etc., can solve problems such as low measurement accuracy and measurement error.

Active Publication Date: 2010-05-26
SUZHOU CHINT ENTERPRISE DEV
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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 for measuring interface shear strength under elastoplastic contact of disk and slab and device thereof
  • Method for measuring interface shear strength under elastoplastic contact of disk and slab and device thereof
  • Method for measuring interface shear strength under elastoplastic contact of disk and slab and device thereof

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Embodiment

[0085] The disc is made of No. 20 steel, the contact surface hardness is HRD2=0.5GPa; the plate is made of No. 45 steel, the contact surface is quenched, and the surface hardness is HRD1=2.0GPa. The contact surface roughness of disc and plate 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.

[0086] 1. 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 the plate is w ...

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Abstract

The invention relates to a method for measuring interface shear strength under elastoplastic contact of a disk and a slab and a device thereof. The method comprises the following steps: A. when the disk is static, enabling the slab to slide at the speed of u corresponding to the disk with the slide-roll ratio being 2; B. supplying the measured lubricating oil to the line contact area so that the line contact area forms a hydrodynamic lubrication, and applying a load between the disk and the slab so that the maximum hertz contact pressure of the line contact is greater than 0.4 GPa; C. and respectively measuring the friction factor values of the disk contact surface or slab contact surface under two loading, and solving a system of linear equations of two unknowns about the friction factors of the contact surfaces. The method and the device of the invention have obvious technical effects, have the advantages of large range of tested lubricating oil pressure, simple and compact structure, easy realization, low manufacturing cost and use cost, easy measurement, high measuring accuracy and the like, can simultaneously measure the shear strength parameter values of two interfaces, and have obvious use value. The device of the invention can replace measuring devices such as high-pressure chamber measuring devices 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 under atmospheric pressure and lubricating oil-contact surface interface shear strength-lubricating oil pressure under elastic-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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N19/02
Inventor 张永斌
Owner SUZHOU CHINT ENTERPRISE DEV
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