Mechanical Behavior of PLA/Clay Reinforced Nanocomposite Material Using FE Simulations: Comparison of an Idealized Volume against the Real Electron Tomography Volume

2016 ◽  
Vol 1139 ◽  
pp. 20-24
Author(s):  
Pello Jimbert ◽  
M. Iturrondobeitia ◽  
R. Fernandez-Martinez ◽  
T. Guraya ◽  
J. Ibarretxe
Keyword(s):  
Finite Element ◽  
Mechanical Behavior ◽  
Fe Simulation ◽  
Electron Tomography ◽  
Tomographic Reconstruction ◽  
Realistic Model ◽  
Simulation Software ◽  
Fe Simulations ◽  
Starting Point ◽  
Microstructural Data

The present work describes a methodology to implement microstructural data obtained from TEM tomography into finite element (FE) simulation software. In this first approach the tomographic reconstruction is treated with different software to create a 3D realistic model of the microstructure of the composite. This realistic model is compared against 2D image-based models via FE simulations in order to compare the mechanical behavior achieved with both procedures. After this first study the results obtained with both types of model are similar. These results are a promising starting point for the development of this novel methodology for obtaining nanocomposite FE models from TEM tomography with realistic results.

scholarly journals Influence of the stiffness of machine axes on the formation of wrinkles during rotary draw bending

2020 ◽  
Vol 2 (10) ◽  
Author(s):  
Linda Borchmann ◽  
Christopher Heftrich ◽  
Bernd Engel
Keyword(s):  
Finite Element ◽  
Process Control ◽  
Fe Simulation ◽  
Rotary Draw Bending ◽  
Practical Test ◽  
Fe Simulations ◽  
Draw Bending ◽  
Component Quality

Abstract This study presents that finite element (FE) simulations of rotary draw bending are improved by taking into account the stiffnesses of the machine axes. The results show the influence of the axis stiffnesses of the bend die, the wiper die, the pressure die and the mandrel on the formation of wrinkles at the inner tube bend. For this purpose the axis stiffnesses are varied in FE-simulations and wrinkle evaluation factors of the final components are determined and compared. Low axis stiffnesses correspond to large axial displacements when force is applied and cause greater wrinkle formation. In addition, practical tests are carried out on the machine to measure the axis displacements and associated forces. The resulting axis stiffnesses are entered into the FE simulation. The final geometry of the bending component of the FE simulation is compared with the geometry of a component produced in a practical test. The consideration of the axis stiffness in the calculation in contrast to ideally stiff axes provides wrinkle heights that are closer to the wrinkle heights in the practical test. The knowledge gained improves the prediction of the component quality and allows the evaluation of axis displacements measured on bending machines. The overall aim of the project is to react to machine-specific axis stiffnesses in the form of process control.

scholarly journals Modeling of the mechanical behavior of fiber-reinforced ceramic composites using finite element method (FEM)

2014 ◽  
Vol 46 (3) ◽  
pp. 385-390 ◽  
Author(s):  
M.M. Dimitrijevic ◽  
N. Tomic ◽  
B. Medjo ◽  
R. Jancic-Heinemann ◽  
M. Rakin ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Ceramic Matrix Composites ◽  
Ceramic Composites ◽  
Elementary Cell ◽  
Fiber Reinforced ◽  
Starting Point ◽  
Fiber Matrix ◽  
Element Method

Modeling of the mechanical behavior of fiber-reinforced ceramic matrix composites (CMC) is presented by the example of Al2O3 fibers in an alumina based matrix. The starting point of the modeling is a substructure (elementary cell) which includes on a micromechanical scale the statistical properties of the fiber, matrix and fiber-matrix interface and their interactions. The numerical evaluation of the model is accomplished by means of the finite element method. The numerical results of calculating the elastic modulus of the composite dependance on the quantity of the fibers added and porosity was compared to experimental values of specimens having the same composition.

Finite Element Analysis and Calculation of Tongue-Tearing Process of Woven Fabric

2011 ◽  
Vol 181-182 ◽  
pp. 443-448 ◽  
Author(s):  
Ping Wang ◽  
Bao Zhong Sun
Keyword(s):  
Finite Element ◽  
Fe Simulation ◽  
Test System ◽  
Simulation Software ◽  
Woven Fabric ◽  
Fe Model ◽  
Element Analysis ◽  
Weave Structure ◽  
Simulation And Experiment ◽  
Tearing Strength

Tearing is a common failure type during the service life of woven fabric. In this paper, tongue-tearing strength of a tight twill-woven fabric with weave structure of was tested on the Material Test System (MTS810.23). A Finite Element (FE) model was developed with FE simulation software ABAQUS based on the geometrical characteristics of the woven fabric. With this meso-modeling method, the whole tongue-tearing process was dynamically displayed. Tearing strength and failure morphologies were compared between FE simulation and experiment result, and good agreements were found. Also, a mesh scheme independent research was conducted for this FE model.

Practical electron tomography

1995 ◽  
Vol 53 ◽  
pp. 742-743
Author(s):  
C.L. Woodcock
Keyword(s):  
Electron Tomography ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
3D Shape ◽  
Computational Resources ◽  
Shape Of Particles

Despite the potential of the technique, electron tomography has yet to be widely used by biologists. This is in part related to the rather daunting list of equipment and expertise that are required. Thanks to continuing advances in theory and instrumentation, tomography is now more feasible for the non-specialist. One barrier that has essentially disappeared is the expense of computational resources. In view of this progress, it is time to give more attention to practical issues that need to be considered when embarking on a tomographic project. The following recommendations and comments are derived from experience gained during two long-term collaborative projects.Tomographic reconstruction results in a three dimensional description of an individual EM specimen, most commonly a section, and is therefore applicable to problems in which ultrastructural details within the thickness of the specimen are obscured in single micrographs. Information that can be recovered using tomography includes the 3D shape of particles, and the arrangement and dispostion of overlapping fibrous and membranous structures.

A Finite Element (FE) simulation of naked solid steel beam at elevated temperature

2018 ◽  
Vol 10 (9) ◽  
Author(s):  
Fariz Aswan Ahmad Zakwan ◽  
◽  
Renga Rao Krishnamoorthy ◽  
Azmi Ibrahim ◽  
Ruqayyah Ismail ◽  
...  
Keyword(s):  
Finite Element ◽  
Elevated Temperature ◽  
Fe Simulation ◽  
Steel Beam

DESIGN AND ANALYSIS OF NEW STENT PATTERNS FOR ENHANCED PERFORMANCE

2020 ◽  
Vol 20 (06) ◽  
pp. 2050039
Author(s):  
NISANTHKUMAR PANNEERSELVAM ◽  
SREEKUMAR MUTHUSWAMY
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Blood Flow ◽  
Coronary Artery ◽  
Mechanical Behavior ◽  
Internal Diameter ◽  
Cell Design ◽  
The Finite Element Method ◽  
Stent Expansion ◽  
Stenting Procedure

Deploying a stent to restore blood flow in the coronary artery is very complicated, as its internal diameter is smaller than 3[Formula: see text]mm. It has already been proven that mechanical stresses induced on stent and artery during deployment make the placement of stent very difficult, besides the development of complications due to artery damage. Various stent designs have already been developed, especially in the metallic category. Still, there are possibilities for developing new stent designs and patterns to overcome the complexities of the existing models. Also, the technology of metallic stents can be carried forward towards the development of bioresorbable polymeric stents. In this work, three new stent cell designs (curvature, diamond, and oval) have been proposed to obtain better performance and life. The finite element method is utilized to explore the mechanical behavior of stent expansion and determine the biomechanical stresses imposed on the stent and artery during the stenting procedure. The results obtained have been compared with the available literature and found that the curvature cell design develops lower stresses and, hence, be suitable for better performance and life.

The Finite Element Analysis of the Large-Scale Converter Transformer Valve Side of the Electric Field

2013 ◽  
Vol 325-326 ◽  
pp. 476-479 ◽  
Author(s):  
Lin Suo Zeng ◽  
Zhe Wu
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
Large Scale ◽  
Calculation Model ◽  
Simulation Software ◽  
Field Calculation ◽  
Element Analysis ◽  
Ansys Simulation ◽  
The Finite Element Analysis ◽  
Electric Field Calculation

This article is based on finite element theory and use ANSYS simulation software to establish electric field calculation model of converter transformer for a ±800kV and make electric field calculation and analysis for valve winding. Converter transformer valve winding contour distribution of electric field have completed in the AC, DC and polarity reversal voltage.

Numerical Analysis of Residual Stresses and Distortions in Aluminium Alloy Welded Joints

2015 ◽  
Vol 809-810 ◽  
pp. 443-448 ◽  
Author(s):  
Tomasz Kik ◽  
Marek Slovacek ◽  
Jaromir Moravec ◽  
Mojmir Vanek
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminium Alloy ◽  
Thermal Cycle ◽  
Technology Development ◽  
Welding Process ◽  
Simulation Software ◽  
Structure Knowledge ◽  
Welding Processes ◽  
Element Method

Simulation software based on a finite element method have significantly changed the possibilities of determining welding strains and stresses at early stages of product design and welding technology development. But the numerical simulation of welding processes is one of the more complicated issues in analyses carried out using the Finite Element Method. A welding process thermal cycle directly affects the thermal and mechanical behaviour of a structure during the process. High temperature and subsequent cooling of welded elements generate undesirable strains and stresses in the structure. Knowledge about the material behaviour subjected to the welding thermal cycle is most important to understand process phenomena and proper steering of the process. The study presented involved the SYSWELD software-based analysis of MIG welded butt joints made of 1.0 mm thickness, 5xxx series aluminium alloy sheets. The analysis of strains and the distribution of stresses were carried out for several different cases of fixing and releasing of welded elements.

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