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Process for characterizing elastoplasticity of metal material through indentation method

A metal material, plastic mechanics technology, applied in the field of material mechanical properties research, can solve the problem of uniqueness and other problems that are not well solved, and achieve the effect of high precision

Active Publication Date: 2013-05-08
XIANGTAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] Although the predecessors have had some research results on the characterization of the elastic-plastic mechanical properties of metal materials by indentation method, they have not solved the uniqueness problem well, and this problem is still a hot topic in the academic circle so far! The indentation method is an effective method to characterize the elastic-plastic mechanical properties of metal materials, so researchers are eager to have a set of such characterization methods to solve the uniqueness problem.

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  • Process for characterizing elastoplasticity of metal material through indentation method
  • Process for characterizing elastoplasticity of metal material through indentation method
  • Process for characterizing elastoplasticity of metal material through indentation method

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Embodiment 1

[0020] The specific implementation steps are as follows:

[0021] The first step is based on the conical indenter with a half-cone angle of 70.3°, and establishes a dimensionless functional relationship:

[0022] Using the П theorem, establish the dimensionless functional relationship between the parameters of the load-displacement curve and the parameters of the elastic-plastic mechanical properties of metal materials, and define the third dimensionless function П 3 =ΔA / A, so that:

[0023] P Eh 2 = Π 1 ( E σ y , n ) ...

Embodiment 2

[0035] (1) Select three materials

[0036] The elastic modulus E of the three materials (Yang-Tse Cheng, Che-Min Cheng. Can stress-strain relationships be obtained from indentation curves using conical and pyramidal indenters? Journal of Materials Research. 1999, 14(9): 3495) 200GPa, yield strength σ y They are 2.36, 2.0 and 1.24GPa, respectively, and the hardening exponents n are 0, 0.1 and 0.3, respectively. The elastic-plastic mechanical properties of the three materials are completely different, such as figure 2 shown.

[0037] (2) Indentation of the three selected materials

[0038] Set the maximum indentation depth h max Both are 0.5 μm, and the indentation test is carried out on the three materials (using a conical indenter with a half-cone angle of 70.3°), and the corresponding load-displacement curves are obtained. from image 3 It can be seen that the load-displacement curves of the three materials almost coincide.

[0039] (3) Extract relevant parameters fro...

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Abstract

The invention discloses a process for characterizing the elastoplasticity of a metal material by introducing an extra residual area through an indentation method, belonging to the field of researches on the mechanical properties of a material. Experiment devices required by the method mainly comprise an indentor, and an atomic force microscope or a three-dimensional optical imaging system. The method mainly comprises the following steps: indenting a material to be tested through the indentor to obtain an indention load displacement curve, extracting relevant parameters from the indention load displacement curve, substituting the extracted parameters to an established model, and calculating to obtain the elastoplasticity of the material. The method mainly has the following advantages: different materials having similar indention curves can be successfully separated, and the obtained solution is only; and the solution obtained through back-stepping has a high precision. So the only high-precision elastoplasticity of the indented material can be obtained through back-stepping by utilizing the theoretic model in the invention.

Description

technical field [0001] The invention belongs to the field of research on the mechanical properties of materials, and in particular relates to a method for characterizing elastic-plastic mechanical properties of metal materials by introducing an extra residual area in the indentation process. Background technique [0002] In the past ten years, the rapid development of nanoindentation technology has provided a powerful tool for the study of the mechanical properties of metal materials. Coupled with the vigorous development of nonlinear finite element programs, scientists have increasingly applied finite element numerical simulation and Combined with the indentation test to obtain various mechanical parameters of the material. In 2001, Dao et al established the connection between the indentation load-displacement curve and the elastic-plastic mechanical properties of materials by using dimensional analysis, finite element and nano-indentation experiments. Combined with the ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/42
Inventor 马增胜周益春黄勇力潘勇
Owner XIANGTAN UNIV
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