scholarly journals Determining the elastic-plastic properties of metallic materials through instrumented indentation

2016 ◽  
Author(s):  
Chao Chang
Keyword(s):  
Metallic Materials ◽  
Instrumented Indentation ◽  
Plastic Properties ◽  
Elastic Plastic

Method for Determining the Plastic Properties of Metallic Materials by Instrumented Indentation with Dual Pyramidal Indenters

2014 ◽  
Vol 941-944 ◽  
pp. 1445-1452
Author(s):  
Wei Chen ◽  
De Jun Ma ◽  
Jia Liang Wang ◽  
Yong Huang
Keyword(s):  
Finite Element ◽  
Yield Strength ◽  
Strain Hardening ◽  
Engineering Application ◽  
Strain Hardening Exponent ◽  
Metallic Materials ◽  
Instrumented Indentation ◽  
Plastic Properties ◽  
Functional Relationships ◽  
Element Simulation

Method for determining the plastic properties of metallic materials was proposed based on the functional relationships between representative stress, representative strain and nominal hardness which were established with the aid of dimensional analysis and finite element simulation. The errors of 0.2% yield strength and strain hardening exponent of five engineering metals were from-17.1% to 15.4% and from -0.125 to 0.11, respectively,which satisfied the need of engineering application and verified the effectiveness of the method.

Mechanical Properties of Aluminum Alloys by Instrumented Indentation: Case Study on Almigo Hard

2013 ◽  
Vol 586 ◽  
pp. 59-62
Author(s):  
Jiri Nohava ◽  
Petr Haušild ◽  
David Gichangi Axelson ◽  
Gwenaél Bolloré
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Ferritic Steel ◽  
Peak Load ◽  
Reactor Vessel ◽  
Al Alloy ◽  
Instrumented Indentation ◽  
Plastic Properties ◽  
Elastic Plastic

This paper presents a case study of instrumented indentation for assessment of mechanical properties of a specific Almigo Hard aluminium alloy. It shows that conventional microhardness is not suitable for local testing of this material and that instrumented indentation can reveal significantly more information about the tested material such as Young’s modulus and elastic-plastic characteristics. The study compares mechanical and elastic-plastic properties of the Almigo Hard, aircraft Al alloy and reactor vessel ferritic steel by single peak load and cyclic indentations in order to demonstrate superior properties of the Almigo Hard alloy.

scholarly journals Finite Pure Plane Strain Bending of Inhomogeneous Anisotropic Sheets

Symmetry ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 145
Author(s):  
Sergei Alexandrov ◽  
Elena Lyamina ◽  
Yeong-Maw Hwang
Keyword(s):  
Plane Strain ◽  
Yield Criterion ◽  
Large Strains ◽  
Rigid Plastic ◽  
Plastic Properties ◽  
Elastic Plastic ◽  
Starting Point ◽  
The Difference ◽  
Inside Radius ◽  
Elastic Unloading

The present paper concerns the general solution for finite plane strain pure bending of incompressible, orthotropic sheets. In contrast to available solutions, the new solution is valid for inhomogeneous distributions of plastic properties. The solution is semi-analytic. A numerical treatment is only necessary for solving transcendent equations and evaluating ordinary integrals. The solution’s starting point is a transformation between Eulerian and Lagrangian coordinates that is valid for a wide class of constitutive equations. The symmetric distribution relative to the center line of the sheet is separately treated where it is advantageous. It is shown that this type of symmetry simplifies the solution. Hill’s quadratic yield criterion is adopted. Both elastic/plastic and rigid/plastic solutions are derived. Elastic unloading is also considered, and it is shown that reverse plastic yielding occurs at a relatively large inside radius. An illustrative example uses real experimental data. The distribution of plastic properties is symmetric in this example. It is shown that the difference between the elastic/plastic and rigid/plastic solutions is negligible, except at the very beginning of the process. However, the rigid/plastic solution is much simpler and, therefore, can be recommended for practical use at large strains, including calculating the residual stresses.

Determining Elastic-Plastic Properties of Al6061-T6 from Micro-Indentation Technique

2013 ◽  
Vol 592-593 ◽  
pp. 610-613
Author(s):  
Sina Amiri ◽  
Nora Lecis ◽  
Andrea Manes ◽  
Davide Mombelli ◽  
Marco Giglio
Keyword(s):  
Manufacturing Process ◽  
Optimization Procedure ◽  
Test System ◽  
Standard Test ◽  
Material Behavior ◽  
Plastic Properties ◽  
Representative Strain ◽  
Elastic Plastic ◽  
Dimensionless Analysis ◽  
Micro Indentation

Different approaches have been proposed in order to determine the material behavior of ductile materials. Since, the mechanical properties of a mechanical component are modified during manufacturing process due to plastic deformation, heat treatment and etc, a non-destructive indentation experimental procedure addressed to predict the elastic-plastic properties of material after manufacturing process is of interest. This is especially true for small size components where it is complex to extract specimens to test on standard test system. Based on dimensionless analysis and the concept of a representative strain, different approaches have been proposed to determine the material properties of power law materials by using indentation process. In this work, the Johnson-Cook (JC) constitutive model of the aluminum alloy Al6061-T6 is characterized by means of a well-defined optimization procedure based on micro-indentation testing and high fidelity finite element models and an optimization procedure but without the concept of dimensionless analysis and a representative strain. This methodology allows determining a set of JC constants for Al6061-T6. The obtained results have good agreement with parameters calibrated by means of universal standard tests and reverse engineering approach.

Evaluation of elastic, elastic-plastic properties of thin Pt wire by mechanical bending test

2010 ◽  
Vol 103 (2) ◽  
pp. 493-496 ◽  
Author(s):  
S. K. Deb Nath ◽  
Hironori Tohmyoh ◽  
M. A. Salam Akanda
Keyword(s):  
Bending Test ◽  
Plastic Properties ◽  
Elastic Plastic ◽  
Mechanical Bending
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