A combined dimensional analysis and optimization approach for determining elastic–plastic properties from indentation tests

2011 ◽  
Vol 46 (8) ◽  
pp. 749-759 ◽  
Author(s):  
J J Kang ◽  
A A Becker ◽  
W Sun
Keyword(s):  
Mechanical Properties ◽  
Dimensional Analysis ◽  
Optimization Procedure ◽  
Fe Analysis ◽  
Optimization Approach ◽  
Fe Method ◽  
Plastic Properties ◽  
Elastic Plastic ◽  
Indentation Tests ◽  
Extensive Computation

Loading–unloading curves obtained from indentation experiments can be used to extract elastic-plastic mechanical properties using the finite element (FE) method. However, extensive computation times are required in such an approach due to the fact that the optimization procedure is based on iterative FE computations. In this study, a combined dimensional analysis and optimization approach is developed for the determination of the elastic-plastic mechanical properties of power law materials, without the need for iterative FE analysis. A parametric study using FE analysis is first conducted to construct the appropriate dimensional functions. The optimization algorithm with either a single indenter or dual indenters is then used to obtain the material properties from the given loading–unloading curves. Different sets of materials properties are used and the accuracy and validity of the predicted mechanical properties using the single indenter or dual indenters are assessed.

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.

scholarly journals Characterization of mechanical properties by indentation tests and FE analysis – validation by application to a weld zone of DP590 steel

2009 ◽  
Vol 46 (2) ◽  
pp. 344-363 ◽  
Author(s):  
Kyung-Hwan Chung ◽  
Wonoh Lee ◽  
Ji Hoon Kim ◽  
Chongmin Kim ◽  
Sung Ho Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Weld Zone ◽  
Fe Analysis ◽  
Indentation Tests

Computing Thin Film Mechanical Properties With the Oliver and Pharr Method

1999 ◽  
Vol 593 ◽  
Author(s):  
P.J. Wolff ◽  
B.N. Lucas ◽  
E.G. Herbert
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Dimensional Analysis ◽  
Film Properties ◽  
Element Modeling ◽  
Indentation Tests

ABSTRACTA commonly used technique to compute mechanical properties from indentation tests is the Oliver and Pharr method. Using dimensional analysis and finite element modeling, this paper investigates errors when the Oliver and Pharr method is used to compute thin film properties.

scholarly journals Determination of plastic properties of metals by instrumented indentation using a stochastic optimization algorithm

2009 ◽  
Vol 24 (3) ◽  
pp. 936-947 ◽  
Author(s):  
I. Peyrot ◽  
P-O. Bouchard ◽  
R. Ghisleni ◽  
J. Michler
Keyword(s):  
Mechanical Properties ◽  
Optimization Algorithm ◽  
Plastic Material ◽  
Element Model ◽  
Optimization Approach ◽  
Plastic Properties ◽  
Acta Mater ◽  
Multiple Data Sets ◽  
Load Displacement ◽  
Commercial Solver

A novel optimization approach, capable of extracting the mechanical properties of an elasto-plastic material from indentation data, is proposed. Theoretical verification is performed on two simulated configurations. The first is based on the analysis of the load–displacement data and the topography of the residual imprint of a single conical indenter. The second is based on the load–displacement data obtained from two conical indenters with different semi-angles. In both cases, a semi-analytical approach [e.g., Dao et al., Acta Mater.49, 3899 (2001) and Bucaille et al., Acta Mater.51, 1663 (2003)] is used to estimate Young’s modulus, yield stress, and strain hardening coefficient from the load–displacement data. An inverse finite element model, based on a commercial solver and a newly developed optimization algorithm based on a robust stochastic methodology, uses these approximate values as starting values to identify parameters with high accuracy. Both configurations use multiple data sets to extract the elastic-plastic material properties; this allows the mechanical properties of materials to be determined in a robust way.

Estimation of Elastic-Plastic Tensile Properties Using Nano-Indentation Tests and FE Simulations

2006 ◽  
Vol 326-328 ◽  
pp. 361-364
Author(s):  
Yun Jae Kim ◽  
Tae Kwang Song ◽  
Jun Hee Hanh ◽  
Jun Hyub Park
Keyword(s):  
Tensile Properties ◽  
Reference Strain ◽  
Careful Examination ◽  
Plastic Properties ◽  
Nano Indentation ◽  
Elastic Plastic ◽  
Displacement Response ◽  
Fe Simulations ◽  
Indentation Tests ◽  
Depth Curves

This paper discusses possibilities to extract elastic-plastic properties of nano-scale materials using combined nano-indentation tests with FE simulations. One interesting finding is that FE simulations of nano-indentation with a number of different plastic properties give same load-displacement response, which suggests that plastic properties cannot be determined from simulating load-depth curves from nano-indentation tests. However, careful examination of possible plastic properties suggests a concept of the reference strain, which makes it possible to effectively determine plastic properties from nano-indentation tests with FE simulations.

Assessment of Elastic–Plastic and Electrical Properties of Printed Silver-Based Interconnects for Flexible Electronics

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Hsien-Chie Cheng ◽  
Ruei-You Hong ◽  
Wen-Hwa Chen
Keyword(s):  
Electrical Properties ◽  
Dimensional Analysis ◽  
Flexible Electronics ◽  
Plastic Material ◽  
Electrical Performance ◽  
Plastic Properties ◽  
Solvent Content ◽  
Representative Strain ◽  
Elastic Plastic ◽  
Wide Range

In this work, the elastic–plastic properties of the printed interconnects on a glass substrate with Ag-filled polymer-conductor ink are evaluated through a theoretical framework based on finite element (FE) modeling of instrumented sharp indentation, experimental indentation, the concept of the representative strain, and dimensional analysis. Besides, the influences of the ink-solvent content and temperature on the elastic–plastic and electrical properties of the printed Ag-based interconnects are also addressed. First of all, parametric FE indentation analyses are carried out over a wide range of elastic–plastic material parameters. These parametric results together with the concept of the representative strain are used via dimensional analysis to constitute a number of dimensionless functions, and further the forward/reverse algorithms. The forward algorithm is used for describing the indentation load–depth relationship and the reverse for predicting the elastic–plastic parameters of the printed Ag-based interconnects. The proposed algorithms are validated through the correct predictions of the plastic properties of three known metals. At last, their surface morphology, microstructure, and elemental composition are experimentally characterized. Results show that the elastic–plastic properties and electrical sheet resistance of the printed Ag-based interconnects increase with the ink-solvent content, mainly due to the increase of carbon element as a result of the increased ink-solvent residue, whereas their elastic–plastic properties and electrical performance decreases with the temperature.

Elastic and Plastic Mechanical Properties Determined by Nanoindentation and Numerical Simulation at Mesoscale

2006 ◽  
Vol 326-328 ◽  
pp. 203-206 ◽  
Author(s):  
Feng Yuan Chen ◽  
Rwei Ching Chang
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Numerical Simulation ◽  
Small Scale ◽  
Finite Element Code ◽  
Scale Analysis ◽  
Plastic Properties ◽  
Nanoindentation Testing ◽  
Indentation Tests ◽  
Simulation And Experiment

This work presents a comparison of numerical simulation and experiment of nanoindentation testing. A commercial finite element code ANSYS is adopted in the numerical simulation, in which elastic-plastic properties are considered. A PMMA specimen and a three side pyramidal Berkovich probe tip is used in the indentation tests. While the elastic-linear workhardening properties are adopted, the numerical results agree well with the experimental data for different indentation loads. It proves the numerical simulation can be used in the small scale analysis.

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