Method for obtaining mechanical property of metal material based on load-depth curve

A metal material and curve technology, applied in the field of material mechanical performance testing, can solve the problem of not being able to correctly separate two different materials

Active Publication Date: 2012-05-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF5 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2) When using the spherical indentation method based on representative strain to evaluate material properties, two different depths are generally used. The maximum depth currently used is generally l

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
  • Method for obtaining mechanical property of metal material based on load-depth curve
  • Method for obtaining mechanical property of metal material based on load-depth curve
  • Method for obtaining mechanical property of metal material based on load-depth curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: Firstly, finite element numerical simulation is used to carry out simulation calculations for three materials, alloy steel, aluminum alloy and titanium alloy, whose constitutive relationship conforms to the power law. The radius R of the steel ball used in this example is 0.25mm, and the model diagram is as follows Figure 7 As shown, the respective P-h curves of the obtained alloy steel, aluminum alloy and titanium alloy, such as Figure 8 Some of the results are shown.

[0060] In this case by Figure 8 The curves in get two depths down (h 1 = 0.1R, h 2 =0.4R) integral area, select respective corresponding formula coefficients according to different materials, then by known elastic modulus E, obtain the method for material performance according to the present invention, as flow process Image 6 As shown, the plastic property parameters of three different materials are obtained: including yield strength, strain hardening exponent and tensile strength,...

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

No PUM Login to view more

Abstract

The invention discloses a method for obtaining the mechanical property of a metal material based on a load-depth curve and belongs to the technical field of material property test. On the basis of determining to adopt a large pressed depth ratio (the depth h/the radius R of a pressing head), three kinds of engineering materials, namely alloy steel, aluminum alloy and titanium alloy, of which the elasticity modulus has remarkable difference are treated respectively by adopting two depth combinations (h1=0.1R and h2=0.4R) so as to obtain the respective material property coefficients; a ball factor S which reflects a hardening index effect is introduced so as to obtain a relational expression among a dimensionless function, W/(h3sigmarS ) and E*/(sigmarS); and the mechanical property of a tested material can be finally determined through constitutive relations, obtained by simulation by adopting finite element values, between the coefficients and the materials. By the method, the obtained result is more accurate; and the method is easy and quick and applicable to engineering structural materials in accordance with the power law.

Description

technical field [0001] The invention belongs to the technical field of testing methods for mechanical properties of materials, and specifically relates to a method for obtaining yield strength, work hardening index and tensile strength mechanical properties of metal structural materials based on a load-depth curve (P-h curve). Background technique [0002] The current general-purpose nano-indentation test technology is also called depth-sensitive indication indentation test technology. The test method is to press the pointed cone or spherical indenter into the surface of the material to be tested, and continuously record the loading and unloading of the indenter. The load and displacement data in the process can be used to obtain the load-displacement curve (P-h curve) of the tested material. By establishing a suitable mechanical model, a variety of mechanical parameters can be tested, including hardness, elastic modulus, fracture toughness, stress-strain curve, storage modu...

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
IPC IPC(8): G01N3/08G01N3/42
Inventor 陈军陈怀宁陈静马耀芳
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap