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A Method for Calibrating Microscopic Constitutive Parameters of Metallic Materials Based on Nanoindentation and Finite Element Simulation

A nano-indentation, metal material technology, used in the application of stable tension/pressure to test the strength of materials, analyze materials, instruments, etc., can solve the problem of less research, unable to obtain a unique optimal solution, and difficult to achieve accurate microscopic constitutive parameters. Inversion calibration and other issues to avoid the effect of too large set of non-inferior solutions

Active Publication Date: 2020-07-28
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the literature shows that there are very few studies on the calibration of constitutive parameters using nanoindentation inversion, and all of them are single-objective optimization, only considering the shape of the loading P-h curve as the optimization target, resulting in the The obtained non-inferior solution sets are usually too large to obtain an exact unique optimal solution, so it is difficult to achieve accurate inversion calibration of microscopic constitutive parameters

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  • A Method for Calibrating Microscopic Constitutive Parameters of Metallic Materials Based on Nanoindentation and Finite Element Simulation
  • A Method for Calibrating Microscopic Constitutive Parameters of Metallic Materials Based on Nanoindentation and Finite Element Simulation
  • A Method for Calibrating Microscopic Constitutive Parameters of Metallic Materials Based on Nanoindentation and Finite Element Simulation

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Embodiment 1

[0069] T40 alloy is a kind of α-phase 2 grade industrial pure titanium, which has good plasticity, toughness, high temperature resistance and corrosion resistance. It is widely used in the industrial field, especially in the field of nuclear energy. It is an important nuclear pressure vessel and pipeline material. . The above method is used to invert and calibrate the microscopic constitutive parameters of T40 alloy, and the parameters obtained by inversion calibration are substituted into the finite element model for simulation. The comparison between the obtained simulated indentation response and the corresponding experimental indentation response is as follows image 3 and shown in Table 1. in, image 3 is the comparison between the simulated load-displacement curve (P-h curve) and the experimental curve, Table 1 is the simulated maximum load (P maxFEM ), contact stiffness (S FEM ) and contact hardness (H FEM ) compared with the corresponding experimental value.

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Embodiment 2

[0074] Ti-18 alloy is a near-β-phase high-strength titanium alloy newly developed by TIMET Company of the United States in 2011. It has a yield strength of 1400MPa, a tensile strength of 1600MPa and an elongation of 8%. A new generation of high-strength titanium alloy for high-strength steel for landing gear has great application value and broad application prospects in the field of aviation, especially civil aviation. The above method is used to invert and calibrate the microscopic constitutive parameters of Ti-18 alloy, and the parameters obtained by inversion calibration are substituted into the finite element model for simulation. The comparison between the obtained simulated indentation response and the corresponding experimental indentation response is as follows Figure 4 and shown in Table 2. in, Figure 4 is the simulated load-displacement curve (P-h curve) FEM Compared with the experimental curve, Table 2 shows the simulated maximum load (P maxFEM ), contact stiff...

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Abstract

The invention discloses a method for inversion calibration of microscopic constitutive parameters of a metal material on the basis of nanoindentation and finite element simulation. The method comprises the following steps: S1, carrying out a nanoindentation test on the surface of the metal material through displacement control so as to obtain an experimental indentation response; S2, establishinga nanoindentation and finiteelement model under an ABAQUS or standard module, and carrying out finiteelement simulation to the process of the nanoindentation test on the metal material mentioned in the step S1 so as to obtain a simulated indentation response; and S3, constructing a multi-objective optimization platform, setting optimization objectives and constraint conditions, acquiring a non-inferior optimal solution set Pareto Front through a multi-objective optimization method based on FMOGA-II algorithm, and determining a unique optimal solution. The method provided by the invention has low cost, is rapid and accurate to calculate, is simple and practicable, is extensively applicable to inversion calibration of microscopic constitutive parameters of multi-metal materials, and has highpractical value in computational mechanics, experimental mechanics and engineering practical application.

Description

technical field [0001] The invention belongs to the technical field of characterization of mechanical properties of materials, and in particular relates to a multi-objective optimized method for calibrating microscopic constitutive parameters of metal materials based on nano-indentation and finite element simulation inversion. Background technique [0002] Nanoindentation is a relatively simple, convenient and widely used mechanical testing method. Due to its advantages of small action area (micron level) and high test accuracy (load at micronewton level, displacement at nanometer level), especially Suitable for the characterization and measurement of various mechanical properties such as elastic modulus, yield strength, fracture toughness, strain hardening index, etc. of various solid materials including metals, polymers, ceramics, glass, semiconductors, thin films, and coatings on local materials . [0003] Due to its powerful functions and wide applicability, the finite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0216G01N2203/0676
Inventor 李宇罡陈东耿继伟夏存娟马乃恒王浩伟
Owner SHANGHAI JIAO TONG UNIV
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