Measuring method and device for evaluating microscopic mechanical properties of surface gradient metal materials

Abstract

A method and device for evaluating and measuring microscopic mechanical properties of surface gradient metal materials, including: establishing a finite element model for nanoindentation tests to verify the reliability of the model; based on the surface treatment process and the elastic modulus of the matrix material, estimating the surface gradient material The mesoscopic mechanical performance parameters of the above-mentioned finite element model are combined to calculate its corresponding microscopic mechanical performance parameters; based on the mathematical modeling method, the applied load and the indentation contact depth are subjected to dimensional analysis, and a dimensionless equation is established; according to the dimensionless equation , select the estimated and calculated corresponding micro-mechanical performance parameters, and establish a dimensionless functional relationship; along the different depth directions of the sample surface, combined with nano-indentation tests, the load-displacement response curve is obtained, and the micro-mechanical properties of the corresponding position of the material are reversed. Observational mechanical property parameters; based on the determined mesoscopic mechanical property parameters, the mesoscopic mechanical property gradient curve of the surface gradient material is established.

Description

technical field [0001] The invention relates to a testing technology for the mechanical properties of metal materials, in particular to a method and device for evaluating and measuring microscopic mechanical properties of surface gradient metal materials. Background technique [0002] With the development of industrial high-end, micro-miniature machinery or components have been developed and used in large quantities. At the same time, in order to meet the requirements of high strength and high reliability of the mechanism, new surface treatment processes such as pulse discharge, ion implantation, laser shock and carburizing treatment processes are also widely used. Therefore, it is particularly important to clarify the basic mechanical properties of the component materials including the treatment layer. [0003] The mechanical properties of traditional metal materials are obtained through monotonic tensile tests on standard specimens. There are two problems in the measurem...

AI Technical Summary

Problems solved by technology

For surface-treated materials, there are two problems in the measurement of their mechanical properties: (1) The existence of the treatment layer is ignored, and the treatment layer and the substrate are treated as uniform materials, and the gradient change of the surface properties of the material is not considered

(2) For tiny components, the test equipment and measurement methods are not applicable

The nanoindentation instrument can be used to measure the mechanical properties of materials at the micro-nano level, but the current research mainly focuses on thin film materials, and only focuses on the hardness test of surface-treated metal materials. Gradient Mechanical Properties Characterization Method of Materials Including Layers

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