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Method for in-situ press-in to test and extract metal elastoplasticity parameters

A technology for extracting metal and elastoplasticity, applied in the direction of testing material hardness, etc., to achieve the effect of improving effectiveness and high accuracy

Active Publication Date: 2018-08-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of accurate acquisition of indentation contact area, uniqueness of elastic-plastic constitutive relationship and influence of indentation gradient effect in micro-nano indentation test, the present invention provides an in-situ indentation test to extract metal elastic-plastic parameters Methods

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  • Method for in-situ press-in to test and extract metal elastoplasticity parameters
  • Method for in-situ press-in to test and extract metal elastoplasticity parameters
  • Method for in-situ press-in to test and extract metal elastoplasticity parameters

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Embodiment 1

[0063] This embodiment is the extraction of the elastic-plastic parameters of crystal copper. Including the following steps:

[0064] 1) A cylindrical diamond indenter with a diameter of 5.5 μm is used to carry out micro-indentation tests on crystal copper, and the unloading curve (such as figure 1 ) to get its reduced modulus E r It is: 129.5GPa, and the corresponding elastic modulus E is: 130.1GPa (copper Poisson's ratio v is set to 0.33);

[0065] 2) Two kinds of triangular pyramidal diamond indenters with different cone angles (equivalent semi-cone angles are 61.43° and 70.32° respectively) were used to carry out indentation tests on metal copper combined with the continuous stiffness measurement method (CSM), and the indentation load was obtained as - Depth profile (P-h) and continuous measurement of contact stiffness (S-h), such as figure 2 ;

[0066] 3) Based on the relationship between contact area-stiffness-reduced modulus and hardness formula, the real contact a...

Embodiment 2

[0071] 1) A cylindrical diamond indenter with a diameter of 5.5 μm was used to perform micro-indentation tests on crystalline aluminum, and the unloading curve (such as Figure 5 ) to get its reduced modulus E r is 76.6GPa, and the corresponding elastic modulus E is 73.2GPa (the Poisson's ratio v of aluminum is set to 0.33);

[0072] 2) Two kinds of triangular pyramidal diamond indenters with different cone angles (equivalent semi-cone angles are 61.43° and 70.32° respectively) were used to carry out indentation tests on metal aluminum combined with the continuous stiffness measurement method (CSM), and the indentation load was obtained as - Depth profile (P-h) and continuous measurement of contact stiffness (S-h), such as Image 6 ;

[0073] 3) Based on the relational formula of contact area-stiffness-reduced modulus and hardness formula, the actual contact area between the indenter and aluminum and the change value of the hardness with the indentation depth during the inde...

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Abstract

The invention discloses a method for in-situ press-in to test and extract metal elastoplasticity parameters. The method includes: adopting a cylindrical pressure head and two pressure heads differentin cone angle for testing to obtain elasticity modulus of metal; combining with plastic strain gradient theory to give out a load-depth curve (P0-h) with press-in gradient effect impact removed; further acquiring feature stress under action of the pressure heads different in cone angle through numerical simulation inversion; combining with feature strain epsilon r under different cone angles; substituting into a power hardening elasticity constitutive relation to acquire yield stress sigma y and hardening index of a tested material. The method is high in accuracy, impact of press-in gradient effect is removed, and uniqueness of the elasticity constitutive relation is ensured mathematically, so that effectiveness of extracting metal material elasticity parameters on the basis of a micro-nano press-in method.

Description

technical field [0001] The invention relates to a testing and characterization method for the mechanical properties of materials, in particular to a method for extracting elastic-plastic parameters of metals through in-situ pressing tests. Background technique [0002] The mechanical behavior of engineering materials (especially metal materials) is an important basis for their engineering applications, and the effective acquisition of relevant mechanical performance parameters is an important prerequisite for engineering design analysis. The traditional tension / compression method for testing the elastic-plastic properties of metals requires a large sample size and must meet relevant standards. It has been unable to meet the testing requirements in this field. [0003] The instrumented micro-nano indentation test method developed based on the theory of contact mechanics has been widely used in the testing and characterization of the mechanical properties of functional materi...

Claims

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Application Information

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IPC IPC(8): G01N3/42
CPCG01N3/42
Inventor 肖革胜金涛刘二强段茜树学峰李志刚邢学刚
Owner TAIYUAN UNIV OF TECH
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