scholarly journals Reverse Analysis for Determining the Mechanical Properties of Zeolite Ferrierite Crystal

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
J. Lin ◽  
X. Y. Niu ◽  
X. F. Shu
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Single Crystal ◽  
Numerical Simulations ◽  
Work Hardening ◽  
Mechanical Parameters ◽  
Stress Strain Relation ◽  
Work Hardening Rate ◽  
Nanoindentation Experiment ◽  
Reverse Analysis

In order to explore more mechanical properties of zeolite Ferrierite (FER) single crystal, a method of determining its mechanical properties—nanoindentation reverse analysis—was obtained based on the nanoindentation experiment and numerical simulations, and this will be presented in this paper. The yield stress and the characteristic work-hardening rate were gained if its stress-strain relation was a bilinear constitutive relation. The mechanical parameters obtained by reverse analysis have been compared with ones gained by nanoindentation finite-element numerical simulations.

Experimental-Numerical Approach for Characterization of Mechanical Properties of Thin Electrochemically Deposited Chromium and Copper Films

2010 ◽  
Vol 159 ◽  
pp. 157-162
Author(s):  
Sabina Cherneva ◽  
Milko Yordanov ◽  
Dimitar Stoychev ◽  
Rumen Iankov
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Simulations ◽  
Numerical Approach ◽  
Copper Films ◽  
The Finite Element Method ◽  
Electrochemically Deposited ◽  
Nanoindentation Experiment ◽  
Load Displacement

A hybrid experimental-numerical approach, which combines microindentation experiments (where we measure the diagonal of the residual imprint after unloading) and numerical simulations by means of the finite-element method has been developed. The investigated materials in the present work are electrochemically deposited on brass substrates chromium and copper films with known thickness and unknown mechanical properties. Mechanical properties of the brass (CuZn36) substrate are known. Vickers’ microindentation experiments were carried out on the films and as a result the experimental load-displacement curves were obtained. After that the process of microindentation was modelled numerically by means of the finite-element method. Numerically obtained load-displacement curves were compared with the experimental curves. The results show good coincidence between numerical and experimental curves. Additionally it was realized nanoindentation experiment of thin copper film and these two methods (nanoindentation experiment and hybrid experimental-numerical method which combines experiment of microindentation and numerical simulations) for determination of mechanival properties of thin copper films were compared. Results obtained by means of the afore-mentioned two methods almost coincide but the second method is cheaper and gives more information about material properties of the film than the first method. It is shown that the second method is preferable to determine the mechanical properties of thin metal films.

Reverse Plasticity in Nanoindentation

2007 ◽  
Vol 1049 ◽  
Author(s):  
Yongjiang Huang ◽  
Nursiani Indah Tjahyono ◽  
Jun Shen ◽  
Yu Lung Chiu
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Glass Transition ◽  
Single Crystal ◽  
Metallic Glasses ◽  
Deformation Mechanisms ◽  
Glass Transition Temperatures ◽  
Loading Rates ◽  
Nanoindentation Experiment ◽  
Properties Of Materials

AbstractThis paper summarises our recent cyclic nanoindentation experiment studies on a range of materials including single crystal and nanocrystalline copper, single crystal aluminium and bulk metallic glasses with different glass transition temperatures. The unloading and reloading processes of the nanoindentation curves have been analysed. The reverse plasticity will be discussed in the context of plastic deformation mechanisms involved. The effect of loading rates on the mechanical properties of materials upon cyclic loading will also be discussed.

scholarly journals A human skin ultrasonic imaging to analyse its mechanical properties

2009 ◽  
pp. 105-116
Author(s):  
Alexandre Delalleau ◽  
Gwendal Josse ◽  
Jérôme George ◽  
Yassine Mofid ◽  
Frédéric Ossant ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
High Frequency ◽  
Complex Structure ◽  
Mechanical Parameters ◽  
High Frequency Ultrasound ◽  
Specific Procedure ◽  
Complex Behaviour ◽  
Behaviour Law ◽  
Frequency Ultrasound

The analysis of the skin mechanical behaviour is a key-point for different field of investigation. As the skin is a complex structure, studies are usually based on inverse methods that compare experimental and finite element numerical results. Besides the considered behaviour law, one of the most important question concerns the geometrical aspects of the skin tissue. In this paper, it is shown how high frequency ultrasound imaging helps the calculation of skin mechanical parameters. The hypodermis influence is firstly discussed through elastographic analyses. A specific procedure to measure the dermis thickness is then proposed to highlight that such a measurement must be considered to draw reliable conclusions. The obtained results are finally discussed to point out the interest of such simplifications for the study of more complex behaviour laws.

scholarly journals Influence of the Mechanical Properties of Elastoplastic Materials on the Nanoindentation Loading Response

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4842
Author(s):  
Huanping Yang ◽  
Wei Zhuang ◽  
Wenbin Yan ◽  
Yaomian Wang
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
The Other ◽  
Equivalent Model ◽  
Strain Hardening Exponent ◽  
Mechanical Parameters ◽  
The Finite Element Method ◽  
Fem Simulations ◽  
Elastoplastic Materials

The nanoindentation loading response of elastoplastic materials was simulated by the finite element method (FEM). The influence of the Young’s modulus E, yield stress σy, strain hardening exponent n and Poisson’s ratio ν on the loading response was investigated. Based on an equivalent model, an equation with physical meaning was proposed to quantitatively describe the influence. The calculations agree well with the FEM simulations and experimental results in literature. Comparisons with the predictions using equations in the literature also show the reliability of the proposed equation. The investigations show that the loading curvature C increases with increasing E, σy, n and ν. The increase rates of C with E, σy, n and ν are different for their different influences on the flow stress after yielding. It is also found that the influence of one of the four mechanical parameters on C can be affected by the other mechanical parameters.

Material Characteristic for Capability Analysis of Solid Tire by Finite Element Method

2018 ◽  
Vol 777 ◽  
pp. 416-420
Author(s):  
Juthanee Phromjan ◽  
Chakrit Suvanjumrat
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Element Model ◽  
Average Error ◽  
Element Analysis ◽  
Compression Load ◽  
Stress Strain Relation ◽  
The Finite Element Analysis ◽  
Capability Analysis ◽  
The Finite Element Model

The natural rubber compound of each layer of solid tire had determined the mechanical properties in tension. It was found that the stress-strain relation of each material tire layer was fitted very well with the Ogden constitutive model. The R2 which was 0.986, 0.996 and 0.985 represented the certain curve fitting on the internal, middle and tread layer of solid tire, respectively. Subsequently, the Ogden model was implemented in the finite element model of the rubber specimen and solid tire. The finite element analysis results obtained an average error of 18.00% and 14.63% for the specimen and solid tire model by comparing to the physical experiment, respectively. Particularly, the mechanical properties of the natural compounds could be used to predict the ultimate compression load for the solid tire failure.

Single Crystal Modeling for Structural Calculations: Part 1—Model Presentation

1991 ◽  
Vol 113 (1) ◽  
pp. 162-170 ◽  
Author(s):  
L. Me´ric ◽  
P. Poubanne ◽  
G. Cailletaud
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Single Crystal ◽  
Numerical Simulations ◽  
Finite Element Code ◽  
Macro Model ◽  
Good For ◽  
Nickel Base

A micro-macro model derived from slip theory is shown. It is applied to the modeling of nickel base single crystal superalloys. The experimental data include monotonic and cyclic solicitations at 950°C. The general agreement between tests and numerical simulations is good for all the studied orientations: 〈001〉, 〈011〉, 〈111〉, and 〈123〉. The model is simple enough to be implemented in a finite element code as shown in a future part of the paper.

A Review of Rafting in Nickel-Based Single Crystal Superalloys

2017 ◽  
Vol 263 ◽  
pp. 41-49
Author(s):  
Zhi Yuan Yu ◽  
Zhu Feng Yue ◽  
Wei Cao ◽  
Xin Mei Wang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Single Crystal ◽  
Numerical Simulations ◽  
Critical Review ◽  
High Temperature Creep ◽  
Major Work ◽  
Creep Properties ◽  
Temperature Creep ◽  
Directional Coarsening

Nickel-based single crystal superalloys have been widely used in modern aircraft, which is related to its high temperature mechanical strength and creep properties. And the initial cubic γ′ precipitates start to coarsen directionally during high temperature creep, which results in the degradation of the mechanical properties, especially the creep properties. Therefore, it is essential to figure out the mechanism of directional coarsening during the period of high temperature creep. In this article, a broad review of rafting mechanism of nickel-based single crystal superalloys is provided. The major work of this critical review is to introduce several experiments and numerical simulations which are used to analyze the evolution of rafting. For three different numerical simulations, their performance, advantage and disadvantage are discussed in detail. Through methods above, the effect on creep properties is summarized.

Experimental Determination of Mechanical Properties for the Purposes of Numerical Simulations of Car Bumper Tests

2015 ◽  
Vol 732 ◽  
pp. 59-62
Author(s):  
Petr Horník
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Numerical Simulations ◽  
Experimental Determination ◽  
Input Data ◽  
Fe Analysis ◽  
Experimental Methodology ◽  
Material Input

Finite-element (FE) analysis is important instrument for prediction of plastic car bumper tests. Accuracy of FE analysis depends on accuracy of material input data. It has developed experimental methodology for identification of mechanical properties. The methodology leads to more accurate material input data for numerical simulations.

Uniaxial Elasto-Plastic Behaviour of Adhesively Bonded Hollow Sphere Structures (HHS): Numerical Simulations and Experiments

2007 ◽  
Vol 539-543 ◽  
pp. 1874-1879 ◽  
Author(s):  
Thomas Fiedler ◽  
Andreas Öchsner ◽  
José Grácio
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Numerical Simulations ◽  
Hollow Sphere ◽  
Experimental Analysis ◽  
Numerical Approach ◽  
Design Parameters ◽  
Adhesively Bonded ◽  
Plastic Behaviour

This paper is on the investigation of adhesively bonded metallic hollow sphere structures. Two different approaches, namely experimental analysis and finite element cal- culations are applied and the findings of both attempts are compared. In the scope of the numerical approach the influence of the mechanical properties of the adhesive on the me- chanical response of the structure is analysed. Based on these results, suggestions for design parameters are derived.

Quasicontinuum Simulation of Uniaxial Tension of Single Crystal Copper Nanowire

2011 ◽  
Vol 694 ◽  
pp. 200-204
Author(s):  
Xing Lei Hu ◽  
Ying Chun Liang ◽  
Jia Xuan Chen ◽  
Hong Min Pen
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
Single Crystal ◽  
Size Effects ◽  
Tension Test ◽  
Quasicontinuum Method ◽  
Single Crystal Copper ◽  
Copper Nanowire

Quasicontinuum simulations of tension test of single crystal copper nanowire are performed to analyze deformation mechanism of tension process and size effects of mechanical properties. New tension models of nanowire are constructed by using quasicontinuum method, which has combined molecular dynamics and finite element method. Tension processes of three different length nanowires without notches and those with notches are simulated. Yield strength and elastic modulus are calculated according to the obtained load-displacement curves. Finally, the results show that the mechanical properties of copper nanowire have obvious size effect and the notches have obvious influence on the mechanical properties.

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