Method and device for evaluating and measuring mesomechanics/micromechanics performance of surface gradient metal material

Abstract

The invention discloses a method and a device for evaluating and measuring the mesomechanics / micromechanics performance of a surface gradient metal material. The method comprises the following steps: establishing a finite element model for a nano-indentation test, and identifying the reliability of the model; evaluating the mesomechanics performance parameters of the surface gradient material based on a surface treatment process and a base material elastic modulus, and calculating the corresponding micromechanics performance parameters of the surface gradient material by virtue of the finite element model; performing dimensional analysis on an applied load and indentation contact depth based on a mathematical modeling method, and establishing a dimensionless equation; selecting the corresponding mesomechanics / micromechanics performance parameters which are evaluated and calculated according to the dimensionless equation, and establishing a dimensionless function relational expression; performing the nano-indentation test along different depth directions on the surface of a sample to obtain a load-displacement response curve, and reversing the mesomechanics performance parameters of the corresponding position of the material; establishing a mesomechanics performance gradient curve of the surface gradient material based on the determined mesomechanics performance parameters.

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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