502 Elastic-plastic properties evaluation of metallic material by micro-indentation tests : Influence of mechanical polishing for mechanical properties

2001 ◽  
Vol 2001 (0) ◽  
pp. 481-482
Author(s):  
Chikao KURAMOCHI ◽  
Norimasa CHIBA ◽  
Nagahisa OGASAWARA
Keyword(s):  
Mechanical Properties ◽  
Mechanical Polishing ◽  
Plastic Properties ◽  
Metallic Material ◽  
Elastic Plastic ◽  
Indentation Tests ◽  
Micro Indentation

Elastic-plastic properties evaluation of copper by micro-indentation tests

2000 ◽  
Vol 2000 (0) ◽  
pp. 593-594
Author(s):  
Chikao KURAMOCHI ◽  
Norimasa CHIBA ◽  
Nagahisa OGASAWARA
Keyword(s):  
Plastic Properties ◽  
Elastic Plastic ◽  
Indentation Tests ◽  
Micro Indentation

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.

ELASTO-PLASTIC PROPERTIES OF Mo-MODIFIED Ti DEDUCED FROM INDENTATION TESTS AND FINITE ELEMENT ANALYSIS

2019 ◽  
Vol 26 (07) ◽  
pp. 1850225
Author(s):  
YONG MA ◽  
ZHAO YANG ◽  
SHENGWANG YU ◽  
BING ZHOU ◽  
HONGJUN HEI ◽  
...  
Keyword(s):  
Finite Element ◽  
Surface Treatment ◽  
Load Capacity ◽  
Indentation Test ◽  
Element Analysis ◽  
Plastic Properties ◽  
Polynomial Expression ◽  
Indentation Tests ◽  
Graded Material ◽  
Micro Indentation

The aim of this paper is to establish an approach to quantitatively determine the elasto-plastic parameters of the Mo-modified Ti obtained by the plasma surface alloying technique. A micro-indentation test is conducted on the surface under 10[Formula: see text]N. Considering size effects, nanoindentation tests are conducted on the cross-section with two loads of 6 and 8[Formula: see text]mN. Assuming nanoindentation testing sublayers are homogeneous, finite element reverse analysis is adopted to determine their plastic parameters. According to the gradient distributions of the elasto-plastic parameters with depth in the Mo-modified Ti, two types of mathematical expressions are proposed. Compared with the polynomial expression, the linear simplified expression does not need the graded material to be sectioned and has practical utility in the surface treatment industry. The validation of the linear simplified expression is verified by the micro-indentation test and corresponding finite element forward analysis. This approach can assist in improving the surface treatment process of the Mo-modified Ti and further enhancing its load capacity and wear resistance.

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.

scholarly journals Biomimetic Deposition of Hydroxyapatite Layer on Titanium Alloys

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1447
Author(s):  
Madalina Simona Baltatu ◽  
Andrei Victor Sandu ◽  
Marcin Nabialek ◽  
Petrica Vizureanu ◽  
Gabriela Ciobanu
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Orthopedic Implants ◽  
X Ray Diffraction ◽  
Metallic Biomaterials ◽  
Viable Solution ◽  
Indentation Tests ◽  
Good Biocompatibility ◽  
Materials Used ◽  
Micro Indentation

Over the last decade, researchers have been concerned with improving metallic biomaterials with proper and suitable properties for the human body. Ti-based alloys are widely used in the medical field for their good mechanical properties, corrosion resistance and biocompatibility. The TiMoZrTa system (TMZT) evidenced adequate mechanical properties, was closer to the human bone, and had a good biocompatibility. In order to highlight the osseointegration of the implants, a layer of hydroxyapatite (HA) was deposited using a biomimetic method, which simulates the natural growth of the bone. The coatings were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro indentation tests and contact angle. The data obtained show that the layer deposited on TiMoZrTa (TMZT) support is hydroxyapatite. Modifying the surface of titanium alloys represents a viable solution for increasing the osseointegration of materials used as implants. The studied coatings demonstrate a positive potential for use as dental and orthopedic implants.

New Design of Aluminium Based Composites through Combined Method of Powder Metallurgy and Thixoforming

2014 ◽  
Vol 939 ◽  
pp. 68-75 ◽  
Author(s):  
Lygia Maria Policarpio Ferreira ◽  
Maria Helena Robert ◽  
Emin Bayraktar ◽  
Diana Zaimova
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
High Energy ◽  
Raw Material ◽  
Combined Method ◽  
Indentation Tests ◽  
Metal Chips ◽  
Aeronautical Industry ◽  
Semi Solid ◽  
Micro Indentation

The present study deals with a new design of aluminium alloy based composites reinforced with SiC particles and Si/Al2O3 powders through combined methods of powder metallurgy and thixoforming. Moreover, recycled machining chips are used as raw material, specifically AA7075 chips generated in the aeronautical industry. The proposed method is based on forming at high temperatures a compacted mixture of metal chips and reinforcing particles, with the metal in thixotropic semi-solid condition. Composites containing different SiC weight fractions (10, 20 and 30%) were produced and had their microstructure analyzed. Mechanical properties were evaluated by means of micro-indentation tests. General results show the feasibility of producing composites by the proposed route. Products with good mechanical properties could be obtained. The process, even still not completely optimized as some improvement still must be achieved, can bring a new possibility for the production of a noble material from recycled wastes, particularly important in the high energy spending Al industries.

scholarly journals Study of mechanical performance of polymer nanocomposites reinforced with exfoliated graphite of different mesh sizes using micro-indentation

2021 ◽  
pp. 002199832199321
Author(s):  
S Khammassi ◽  
M Tarfaoui ◽  
K Lafdi
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Exfoliated Graphite ◽  
Displacement Curve ◽  
Particle Sizes ◽  
Reinforced Polymers ◽  
Indentation Tests ◽  
Nano Additives ◽  
The Right ◽  
Micro Indentation

The first phase of this work aims to use the right additive nano-fillers choices, such as exfoliated Graphite (ExG), increasing the mechanical, electrical, and thermal performances. In this work, we are interested in quantifying the effect particles' size on a polymer matrix's performance. For this, three sets of exfoliated polymers filled with Graphite, characterized by three particle sizes, called meshes 50, 100, and 150, were investigated. In this analysis, exfoliated Graphite reinforced polymers were subjected to indentation tests to define local mechanical properties. The sample is an epoxy 862 matrix reinforced with exfoliated graphite additives. For each specific size, the additives are mixed in percentages of 0% in the act of control, 0.5%, 4%, 8%, and 16% by weight. Matching pure polymers, polymers reinforced by exfoliated Graphite have proven to have significant improvements in local elastic properties (such as modulus, hardness, stiffness, etc.). Results showed that the reinforced epoxy's local mechanical properties are affected by the size and the percentage of nano-additives. Through the inspection of the load-displacement curve, it can be concluded that the nano-additive has a significant influence on the plastic mechanical properties of the sample. Therefore, the size of nanoparticles has significantly improved in material properties.

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.

Characterization and Modeling of Large Displacement Micro-/Nano-Indentation of Polymeric Solids

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Y. C. Lu ◽  
D. M. Shinozaki
Keyword(s):  
Large Strain ◽  
Large Displacement ◽  
Plastic State ◽  
Large Strains ◽  
Displacement Curve ◽  
Plastic Properties ◽  
Indentation Tests ◽  
The Mean ◽  
Strain Hardening Behavior ◽  
Micro Indentation

Large displacement micro-indentation tests have been performed on various polymeric solids to measure the plastic properties. Cylindrical flat-ended indenters with diameter in the range of 10–90 μm are mostly used. The mechanism of large-strain indentation has been examined with optical microscopy and finite element simulations. Results show that under a flat-tipped indenter, the material can quickly reach a fully plastic state. The size (diameter) of the plastic zone is constant in large-strain regions and unaffected by the exact tip profile (flat, spherical, and conical). The indentation stress-displacement curve at large strains is linear as a result of the steady-state plastic flow, from which the mean indentation pressure, a measure of yield strength, can be readily extrapolated. The indentation stress-displacement response is independent of the indenter diameters but strongly dependent on the strain-hardening behavior of the material and the friction between a material and an indenter. Compared with other shaped indenters, the flat-ended indenter requires the least penetration depth in order to probe the plastic properties of a material or structure.

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