Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for determining a conical indentation constraint factor and a representative strain of a titanium alloy

A technology of constraint factors and determination methods, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the relationship between performance changes of constraint factors, and achieve wide practicability, high precision, and good results. Effect

Active Publication Date: 2019-03-08
CHINA UNIV OF MINING & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are existing methods for solving the representative strain and constraint factor of titanium alloy. The representative strain and constraint factor obtained by the solution are fixed values, but the relationship between representative strain and constraint factor and the change of titanium alloy properties is not given.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for determining a conical indentation constraint factor and a representative strain of a titanium alloy
  • A method for determining a conical indentation constraint factor and a representative strain of a titanium alloy
  • A method for determining a conical indentation constraint factor and a representative strain of a titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: Taking TC11 titanium alloy as an example, when the elastic modulus is 70Gpa and the yield strength is 800MPa, the strain hardening exponent is 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, and the indentation is limited The indentation hardness calculated by the meta-model is 2.7439, 2.7585, 2.8036, 2.8267, 2.8653, 2.8988, 2.9266, 2.9746, 2.9945, respectively, through the formula ln(H / σ y )=lnC+nln(Eε r / σ y ) for fitting, the constraint factor obtained from the solution is 3.267, and the representative strain is 0.024.

[0058] When the elastic modulus is 70Gpa, the yield strength is 1400MPa, and the strain hardening exponent is 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, the indentation hardness calculated by the indentation finite element model is 4.1262, 4.1508, 4.2107, 4.2497, 4.2798, 4.3178, 4.3749, 4.4186, 4.4531, through the formula ln(H / σ y )=lnC+nln(Eε r / σ y ) for fitting, the constraint factor obtained from the solution is 2...

Embodiment 2

[0061] Example 2: Taking TC11 titanium alloy as an example, when the elastic modulus is 110Gpa and the yield strength is 800MPa, the strain hardening exponent is 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, and the indentation is limited The indentation hardness calculated by the meta-model is 3.0139, 3.0824, 3.0922, 3.1679, 3.1882, 3.2551, 3.2876, 3.3501, 3.3862, respectively, through the formula ln(H / σ y )=lnC+nln(Eε r / σ y ) for fitting, and the constraint factor obtained from the solution is 3.565, representing a strain of 0.024.

[0062] When the elastic modulus is 110Gpa, the yield strength is 1400MPa, and the strain hardening exponent is 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, the indentation hardness calculated by the indentation finite element model is 4.6874, 4.7236, 4.7405, 4.8388, 4.8821, 4.9074, 5.0015, 5.0590, 5.0901, through the formula ln(H / σ y )=lnC+nln(Eε r / σ y ) for fitting, the constraint factor obtained from the solution is 3.1...

Embodiment 3

[0065] Example 3: Taking TC11 titanium alloy as an example, when the elastic modulus is 150Gpa and the yield strength is 800MPa, the strain hardening exponent is 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, and the indentation is limited The indentation hardness calculated by the meta-model is 3.2044, 3.2611, 3.2898, 3.3790, 3.4137, 3.4796, 3.5452, 3.5702, 3.6741, respectively, through the formula ln(H / σ y )=lnC+nln(Eε r / σ y ) for fitting, the constraint factor obtained from the solution is 3.744, and the representative strain is 0.023.

[0066] When the elastic modulus is 150Gpa, the yield strength is 1400MPa, and the strain hardening exponent is 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, the indentation hardness calculated by the indentation finite element model is 5.0260, 5.1123, 5.1213, 5.2425, 5.2936, 5.3282, 5.4536, 5.4965, 5.5590, through the formula ln(H / σ y )=lnC+nln(Eε r / σ y ) for fitting, the constraint factor obtained from the solution is...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
elastic modulusaaaaaaaaaa
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for determining a conical indentation constraint factor and a representative strain of a titanium alloy, belonging to a method for calculating the representative strain and the constraint factor of the titanium alloy. The method is characterized in that firstly, the hardness of titanium alloy under different yield strength, strain hardening exponent and elastic modulus are calculated; then under the condition of constant modulus of elasticity, the linear fitting is carried out by using the formula, and the representative strains and restraint factors under different yield strength conditions are solved by fitting the slope and intercept lnC respectively; the representative strains under different yield strength conditions are averaged to determine the representative strains; the linear fitting of the constraint factors and the yield strength is carried out to determine the linear fitting constants p and q in the relationship; the yield strength and theindentation hardness data are fitted linearly to determine the linear fitting constants i and j in the relationship, and the relation is put to obtain the relationship between indentation hardness and constraint factor. The mehod has the advantages that the method is rapid and simple, is easy to operate and is good in effect.

Description

technical field [0001] The invention relates to a calculation method for titanium alloy representative strain and constraint factor, in particular to a determination method for titanium alloy conical indentation constraint factor and representative strain. Background technique [0002] Titanium alloys have high specific stiffness, high specific strength and excellent comprehensive mechanical properties, and are widely used in aviation and aerospace fields. Indentation technology for measuring material properties has the advantages of simple sample preparation, convenient operation, and non-destructive, so it is widely used in the performance testing of titanium alloys. The indentation test technology is a method of pressing the indenter into the material to be tested, and obtaining the load-displacement curve by continuously recording the load and displacement data of the indenter loading and unloading process. By analyzing the load-displacement curve, not only the elastic ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 吉喆沈承金徐杰郭涛
Owner CHINA UNIV OF MINING & TECH