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Analysis method of indentation data

A technology of data analysis and indentation, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of uncommon analysis methods, and achieve the effect of avoiding the measurement of complex materials

Inactive Publication Date: 2014-10-01
SUN YAT SEN UNIV
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to propose a method for analyzing indentation data, which can solve the problem that traditional analysis methods are not universal

Method used

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  • Analysis method of indentation data

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Embodiment Construction

[0027] In the following, the present invention will be further described in conjunction with the drawings and specific embodiments.

[0028] combine figure 1 Shown, a kind of indentation data analysis method, it comprises the following steps:

[0029] Step 1. Establish a finite element model of the indentation test process, wherein the mechanical parameters of the material to be tested are defined as variables. The finite element model includes a material model selected according to the type of material to be tested.

[0030] Considering that when analyzing the indentation force-indentation depth data, the pyramidal indenter such as Berkovich can be replaced by an equivalent conical indenter, so this embodiment uses an axisymmetric finite element model. A spherical indenter is defined as a rigid 1 / 4 arc, and a conical indenter is defined as a rigid straight line. For the Berkovich indenter, the equivalent inclination angle of the straight line is 65.03°, and for the Vicker ...

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Abstract

The invention relates to an analysis method of indentation data. The core of the method is based on the numerical optimation of a Levenberg-Marquardt algorithm, an optimized target function is a difference between the indentation data obtained by finite element modelling and experiment indentation data, and an optimized parameter is a mechanical parameter of a tested material to be obtained. A plurality of loading and unloading schemes and constitutive models of materials can be defined in the finite element model, therefore, the analysis method of the data is very strong in universality.

Description

technical field [0001] The invention relates to an indentation data analysis method. Background technique [0002] As the simplest and most feasible method, the indentation method may be the earliest mechanical property testing method used by humans. According to the difficulty of indentation or the size of the residual indentation area, various hardness indexes have been defined to evaluate the ability of materials to resist permanent deformation. The head is pressed into the material to be tested, and the softness and hardness of the material are evaluated according to the residual deformation of the pressed-in area. Depending on the indenter, load, and load retention time, there are various types of indentation hardness, such as Brinell hardness, Rockwell hardness, Vickers hardness, and microhardness. [0003] The hardness test is simple and easy, and the data repeatability is good. However, hardness is only a comprehensive index to measure the ability of materials to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张纯禹
Owner SUN YAT SEN UNIV
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