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.

Energy exchanges during indentation tests in fresh-water ice

1991 ◽  
Vol 15 ◽  
pp. 247-253
Author(s):  
Devinder S. Sodhi
Keyword(s):  
Experimental Data ◽  
Heat Dissipation ◽  
Graphical Form ◽  
Small Scale ◽  
Water Ice ◽  
Structure Interaction ◽  
First Law Of Thermodynamics ◽  
Indentation Tests ◽  
Energy Exchanges ◽  
Work Done

The data from a small-scale experimental study on ice-structure interaction are used to compute the energy exchanges that take place during creep deformation and intermittent and continuous crushing of ice. The energy supplied by the carriage is partly stored in the structural spring, partly converted to kinetic energy, partly dissipated in deforming and extruding the ice and partly dissipated as heat in the damping mechanisms of the structure. Except for the heat dissipation, all other forms of energy were computed from the experimental data, and the heat dissipation was computed from the energy balance using the first law of thermodynamics. Plots of all forms of energy are shown in graphical form, in which their relative magnitudes, times of occurrence and interplay can be seen. The main result of this study is the thesis that intermittent crushing or ice-induced vibration takes place whenever there is an imbalance between the rates of work done by the carriage and the indentor and that there are no vibrations when these rates of work are equal.

Study on the Mechanical Properties of Sapphire by Numerical Simulation and Nanoindentation Technology

2009 ◽  
Vol 69-70 ◽  
pp. 103-107 ◽  
Author(s):  
Ke Hua Zhang ◽  
Dong Hui Wen ◽  
Tao Hong ◽  
Ju Long Yuan
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Plastic Region ◽  
Nanoindentation Test ◽  
Fe Modeling ◽  
The Finite Element Method ◽  
Simulation And Experiment ◽  
Abrasive Process

This paper presents a finite element (FE) modeling of the nanoindentation test of sapphire, in which the finite element method was employed to study the mechanical characteristic of sapphire under the nanoindentation process. The results demonstrated that the nanoindentation FE models were able to simulate the indentation loading-unloading curves of the sapphire. The load and unload displacement curves of the simulation and experiment results can match with each other well, and then the properties used in the simulation should be the actual properties of the sapphire. The Mises stress field distribution of the sapphire sample was calculated to reveal the alteration from elastic region to plastic region, which are useful for indentifying the ductile to brittle change in the sapphire abrasive process.

Small Scale Plastic Yielding of Mg Alloys Assessed with Nanoindentation

2020 ◽  
Vol 405 ◽  
pp. 339-344
Author(s):  
Jiří Němeček ◽  
Jan Maňák ◽  
Jiří Němeček
Keyword(s):  
Focused Ion Beam ◽  
Electron Backscatter Diffraction ◽  
Ion Beam ◽  
Az31 Alloy ◽  
Small Scale ◽  
Spherical Indentation ◽  
Plastic Properties ◽  
Indentation Tests ◽  
Order Of Magnitude ◽  
Volume Characteristics

The paper investigates deformations and plastic properties received from different material volumes and tests of magnesium samples. Small volume characteristics gained on single Mg crystals are compared to polycrystalline AZ31 alloy. Results of tests employing nanoindentation, focused ion beam milling and electron backscatter diffraction techniques are presented. Large differences were found between micro-beam testing and spherical indentation tests having the volume one order of magnitude apart. The plastic strength scaling factor was found 1.7 for the studied grain configurations and volumes.

scholarly journals Comparison of Numerical Simulation and Experiment for the Microstructure Development of a Cold-Rolled Multiphase Steel during Annealing

2016 ◽  
Vol 854 ◽  
pp. 167-173 ◽  
Author(s):  
Norbert Kwiaton ◽  
Roman Kuziak ◽  
Maciej Pietrzyk
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Process Parameters ◽  
Temperature Cycle ◽  
Microstructure Development ◽  
Tempered Martensite ◽  
Temperature Cycles ◽  
Simulation And Experiment ◽  
Cold Rolled ◽  
Multiphase Steel

JAMK model, developed as part of RFSR-project “VADPsheets”, was applied to analyse different time temperature cycles from industrial time temperature cycle. The results of numerical simulation are compared with experimentally determined mechanical properties and microstructures. By distinguishing of recrystallized ferrite, ferrite after transformation, tempered martensite, bainite and martensite can be explained the experimentally obtained mechanical properties. The results of simulation can be used to optimizing the properties and to generate a better understanding of process parameters.

Mechanical characterisation of an organic phantom candidate for breast tissue

2019 ◽  
Vol 34 (8) ◽  
pp. 1163-1170
Author(s):  
Ana M Teixeira ◽  
Pedro Martins
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Mechanical Behaviour ◽  
Breast Tissue ◽  
Structure And Properties ◽  
Normal Tissues ◽  
Mechanical Characterisation ◽  
Material Stiffness ◽  
Indentation Tests ◽  
Breast Tissues

The aim of this study is to analyse the mechanical properties of agarose, which can be used as a mechanical phantom for breast tissues. In general, tissue mimicking materials may be used to achieve a better understanding of the structure and properties of tissues and organs; this work shares these objectives. The phantom can be used as a tissue surrogate with realistic mechanical behaviour for biomechanical applications. To validate agarose as a suitable mechanical phantom for breast tissues, indentation tests were performed in homogeneous, rectangular agarose blocks. Blocks with different agarose concentrations were moulded and tested. An estimation of the material stiffness was then compared with experimental data on different breast tissues’ types found in literature. The phantom stiffness increased consistently with agarose concentration and stress. The results show that agarose-based mechanical phantoms of stiffer tissues require higher agarose concentrations (0.5% and 0.6%). In contrast, normal tissues can be mimicked with 0.3% and 0.4% of agarose. In addition, it was observed that preconditioning affects the mechanical properties of the gel, as it had already been shown in literature for breast tissues.

Simulation and Experimental Study on the Impact of Breadth of Back Blade on Axial Force Balance

2011 ◽  
Vol 130-134 ◽  
pp. 1568-1572
Author(s):  
Hui Wang ◽  
Jie Gang Mu ◽  
Miao Yin Su ◽  
Shui Hua Zheng ◽  
Jin Jing Zhao ◽  
...  
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Axial Force ◽  
Three Dimensional ◽  
Force Balance ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
The Impact ◽  
The Relationship

The paper studies the relationship between axial force and breadth of back blade by numerical simulation and experiment. On the basis of the RNG k-ε turbulence model and technology of compact local grids and regional computing, three dimensional numerical simulations to 100HZ165-250 centrifugal pump with various breadths were carried out. Through comparing and analyzing of the flow field, it can be seen that the axial force reduces with the increase of the back blade breadth. After that, the simulation results were verified by the experimental data got from different test devices, and it shows that the conclusions are reliable.

Numerical Simulation and Experiment of a New Drive Device of High-Temperature Magnetic Pump

2010 ◽  
Vol 26-28 ◽  
pp. 736-741
Author(s):  
Dan Qing Yuan ◽  
You Quan He ◽  
Jian Ping Li ◽  
He Zhang ◽  
Chun Fang Chang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
High Temperature ◽  
Electromagnetic Coupling ◽  
Coupling Method ◽  
Key Factors ◽  
Analysis Software ◽  
Depth Study ◽  
Simulation And Experiment

To resolve the problem of degaussing of the magnetic pump, a new drive device is designed, consist of external magnetic rotor,isolation units and torque ring. Based on ANSYS12.0 analysis software, electromagnetic coupling method is firstly adopted on the simulation of this drive device. The comparison of simulation value and experimental data indicates that this method is feasible. For the purpose to provide evidence for more in-depth study of high temperature magnetic pump. Especialy,some key factors effecting on torque are considered, and this will provide references for further study of high-temperature magnetic pump.

scholarly journals A Comparison of Simulation’s Results with Experiment on Water Mitigation of an Explosion

1999 ◽  
Vol 6 (2) ◽  
pp. 73-80 ◽  
Author(s):  
W.K Chong ◽  
K.Y. Lam ◽  
K.S. Yeo ◽  
G.R. Liu ◽  
O.Y. Chong
Keyword(s):  
United States ◽  
Experimental Data ◽  
Finite Element ◽  
United States Army ◽  
Peak Pressure ◽  
Three Dimensional ◽  
The United States ◽  
Small Scale ◽  
Finite Element Code ◽  
Good Comparison

This paper presents a comparison of simulation’s results with the experimental data from a series of small-scale tests conducted by Joachim and Lunderman of the United States Army Engineer Waterways Experiment Station. The purpose of the experiments was to evaluate the effect of water as a mean of reducing airblast pressure from accidental explosions in underground magazines. In the present study, a series of three-dimensional numerical calculations were conducted using a Multimaterial Eulerian Finite Element Code. Results from the numerical simulations show good comparison with the experimental data for the case with and without water. Our simulation ascertains the mitigation effects of water in reducing the maximum peak pressure and impulse density due to an explosion.

Numerical Simulation and Experimental Research on Fatigue Strength of the Injector Guide Pillar under Complex Loads

2010 ◽  
Vol 118-120 ◽  
pp. 196-200
Author(s):  
Jin Guo Li ◽  
Xiao Gui Wang ◽  
Zeng Liang Gao
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Numerical Analysis ◽  
Experimental Research ◽  
Contact Surface ◽  
Electronic Measurement

Under the complex loads, the injector guide pillar (IGP) used in injection machine was failure only after 1.5-year-service. In order to determine the cause of the fracture, the numerical simulation technology was applied to analyze the mechanical properties of the IGP. The contact between the mating surfaces of the clamping mechanism was modeled; nonlinear multi-region contact of surface-surface was applied to establish the contact model of FEA. The constraint of tie was used for modeling thread joint. The simulated results indicated that the smaller area of contact surface, the higher value of stress in the neck of IGP. Electronic measurement was also used to check the results of stress in IGP obtained by FEA. It was found that the experimental data agreed well with simulated results. Based on the numerical analysis and experimental study, the structure of IGP was improved by adopting a smoother double-round neck. The fatigue life of the improved structure was longer than that of the original machine.

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.

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