Mixed Experimental and Numerical Study of Steel Ferrule Forming by Low-Contact Deformation Process

2012 ◽  
Author(s):  
J. Raujol-Veillé ◽  
F. Toussaint ◽  
L. Tabourot ◽  
M. Vautrot ◽  
P. Balland
Keyword(s):  
Numerical Analysis ◽  
Finite Elements ◽  
Deformation Process ◽  
3D Model ◽  
Numerical Study ◽  
Numerical Comparison ◽  
Contact Deformation ◽  
Axisymmetric Model ◽  
Part Geometry ◽  
Cpu Time

The present work aims to develop a steel ferrule forming by a low-contact deformation process using numerical analysis. Two Finite Elements (FE) models have been developed within ABAQUS. The first one is a 3D model that can both calculate the forming geometry of the part and the forces applied on the roller. The second one is a 2D axisymmetric model allowing reducing the CPU time without important loss of accuracy on the final part geometry. We present in this paper a mixed experimental/numerical comparison performed with each model and discuss the results with measurements coming from a part manufacturing by the industrial partner.

A numerical study of the effect of the number of turns of coil on the heat produced in the induction heating process in the 3d model

2018 ◽  
Vol 18 (3) ◽  
pp. 408-419
Author(s):  
A J shokri ◽  
M H Tavakoli ◽  
A Sabouri Dodaran ◽  
M S Akhondi Khezrabad ◽  
◽  
...  
Keyword(s):  
Induction Heating ◽  
3D Model ◽  
Numerical Study ◽  
Heating Process

scholarly journals Numerical Study of Cooling by Ferrofluids in an Electrical Transformer using an Axisymmetric Model

2021 ◽  
pp. 1-1
Author(s):  
Raphael Zanella ◽  
Caroline Nore ◽  
Xavier Mininger ◽  
Frederic Bouillault ◽  
Jean-Luc Guermond
Keyword(s):  
Numerical Study ◽  
Axisymmetric Model

Thermal jet drilling of granite rock: a numerical 3D finite-element study

2021 ◽  
Vol 379 (2196) ◽  
pp. 20200128
Author(s):  
Timo Saksala ◽  
Reijo Kouhia ◽  
Ahmad Mardoukhi ◽  
Mikko Hokka
Keyword(s):  
Finite Elements ◽  
Numerical Study ◽  
Thermal Flux ◽  
Three Dimensional ◽  
Numerical Approach ◽  
Mass Scaling ◽  
Granite Rock ◽  
Fracture Dynamics ◽  
Rock Heterogeneity ◽  
Thermal Drilling

This paper presents a numerical study on thermal jet drilling of granite rock that is based on a thermal spallation phenomenon. For this end, a numerical method based on finite elements and a damage–viscoplasticity model are developed for solving the underlying coupled thermo-mechanical problem. An explicit time-stepping scheme is applied in solving the global problem, which in the present case is amenable to extreme mass scaling. Rock heterogeneity is accounted for as random clusters of finite elements representing rock constituent minerals. The numerical approach is validated based on experiments on thermal shock weakening effect of granite in a dynamic Brazilian disc test. The validated model is applied in three-dimensional simulations of thermal jet drilling with a short duration (0.2 s) and high intensity (approx. 3 MW m −2 ) thermal flux. The present numerical approach predicts the spalling as highly (tensile) damaged rock. Finally, it was shown that thermal drilling exploiting heating-forced cooling cycles is a viable method when drilling in hot rock mass. This article is part of the theme issue ‘Fracture dynamics of solid materials: from particles to the globe’.

scholarly journals The interaction of a reinforced concrete cylindrical tank with soil in complicated functional conditions

2018 ◽  
Vol 45 ◽  
pp. 00030
Author(s):  
Barbara Kliszczewicz
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Software Package ◽  
3D Model ◽  
Cylindrical Tank ◽  
Plastic Properties ◽  
Geotechnical Parameters ◽  
Structure Deformation ◽  
High Deformability ◽  
Properties Of Soil

The paper is dedicated to the analysis interactions between the structure of a field-based cylindrical tank made from reinforced concrete and randomly or unevenly distributed strata of subsoil. The numerical analysis with the use of the Z_Soil software package was carried out to investigate how variable geotechnical parameters demonstrated by subsoil strata with a low bearing capacity and a high deformability influence strain and stress of the tank shell and bottom. The arrangement made up of a cylindrical tank and stratified subsoil (its 3D model) was subjected to the analysis with the consideration of the elastic and plastic properties of soil (the Coulomb-Mohr model). The analysis results, presented as diagrams of the structure deformation and stresses illustrate the uneven settlement of the tank shell and its internal strain.

The Effect of the Thickness and Angle of the Inlet and Outlet Guide Vane on the Performance of Axial-Flow Pump

2016 ◽  
Author(s):  
Sang-Won Kim ◽  
Youn-Jea Kim
Keyword(s):  
Numerical Analysis ◽  
Numerical Study ◽  
Guide Vane ◽  
Axial Flow ◽  
Inlet Guide Vane ◽  
Guide Vanes ◽  
Pump Performance ◽  
Blade Thickness ◽  
Axial Flow Pump ◽  
Flow Pump

An axial-flow pump has a relatively high discharge flow rate and specific speed at a relatively low head and it consists of an inlet guide vane, impeller, and outlet guide vane. The interaction of the flow through the inlet guide vane, impeller, and outlet guide vane of the axial-flow pump has a significant effect on its performance. Of those components, the guide vanes especially can improve the head and efficiency of the pump by transforming the kinetic energy of the rotating flow, which has a tangential velocity component, into pressure energy. Accordingly, the geometric configurations of the guide vanes such as blade thickness and angle are crucial design factors for determining the performance of the axial-flow pump. As the reliability of Computational Fluid Dynamics (CFD) has been elevated together with the advance in computer technology, numerical analysis using CFD has recently become an alternative to empirical experiment due to its high reliability to measure the flow field. Thus, in this study, 1,200mm axial-flow pump having an inlet guide vane and impeller with 4 blades and an outlet guide vane with 6 blades was numerically investigated. Numerical study was conducted using the commercial CFD code, ANSYS CFX ver. 16.1, in order to elucidate the effect of the thickness and angle of the guide vanes on the performance of 1,200mm axial-flow pump. The stage condition, which averages the fluxes between interfaces and is accordingly appropriate for the evaluation of pump performance, was adopted as the interface condition between the guide vanes and the impeller. The rotational periodicity condition was used in order to enable a simplified geometry to be used since the guide vanes feature multiple identical regions. The shear stress transport (SST) k-ω model, predicting the turbulence within the flow in good agreement, was also employed in the CFD calculation. With regard to the numerical simulation results, the characteristics of the pressure distribution were discussed in detail. The pump performance, which will determine how well an axial-flow pump will work in terms of its efficiency and head, was also discussed in detail, leading to the conclusion on the optimal blade thickness and angle for the improvement of the performance. In addition, the total pressure loss coefficient was considered in order to investigate the loss within the flow paths depending on the thickness and angle variations. The results presented in this study may give guidelines to the numerical analysis of the axial-flow pump and the investigation of the performance for further optimal design of the axial-flow pump.

scholarly journals Influence of foundation settlements in load redistribution on columns in a monitoring construction - Case Study

2010 ◽  
Vol 3 (3) ◽  
pp. 346-356 ◽  
Author(s):  
G. Savaris ◽  
P. H. Hallak ◽  
P. C. A. Maia
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Finite Elements ◽  
Load Distribution ◽  
Numerical Models ◽  
Normal Load ◽  
Finite Elements Method ◽  
Load Redistribution

The objective of this article is to present the results obtained in a study on the interaction between the behavior of the structure and the foundation settlements and verify the influence of normal load distribution on the columns. In this mechanism, known as structure soil interaction (SSI), as the building is constructed, a transfer of loads occurs from the columns which tend to settle more to those that tend to settle less. The study was conducted in a building which had its settlements monitored from the beginning of construction. For this purpose, a linear tridimensional numerical model was constructed and numerical analysis was performed, using the finite elements method. In these analyses, numerical models corre- sponding to the execution of each floor were used, considering the settlements measured in each stage of the construction. The results of analy- ses showed that the effect of SSI are significant for calculating the normal efforts on the columns, particularly on those located in the first floors.

scholarly journals Numerical analysis of stress distribution generated in spherical polyethylene inserts by knee joint endoprotheses’ sleds

2019 ◽  
Vol 21 (2) ◽  
pp. 1-5
Author(s):  
Marcin Nabrdalik ◽  
Michał Sobociński
Keyword(s):  
Numerical Analysis ◽  
Finite Elements ◽  
Stress Distribution ◽  
Knee Joint ◽  
Titanium Alloys ◽  
Numerical Method ◽  
Ti6al4v Alloy ◽  
Finite Elements Method ◽  
Weak Points ◽  
Metal Materials

Abstract The paper presents analysis of stress distribution in the friction node of knee joint endoprosthesis where sleds are made of various titanium alloys and CoCrMo cooperate with spherical polyethylene inserts. Currently used titanium alloys consists of Nb, Ta, Zr or Mo and with lesser value of Young’s modulus than Ti6Al4V alloy, or steel CoCrMo, which significantly varies from other metal materials. The obtained results make it possible to indicate the “weak points” of the accepted solution, and thus counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The analysis was conducted with numerical method of ADINA System 8.6. The Finite Elements Method allowed to compute and present stress distribution quickly in all elements of the model.

Numerical Study of the Influence of the Crack Front Curvature in the Evolution of the Plastic Zone along the CT Specimen Thickness

2011 ◽  
Vol 465 ◽  
pp. 119-122 ◽  
Author(s):  
Daniel Camas ◽  
Pablo Lopez-Crespo ◽  
Antonio González-Herrera
Keyword(s):  
Fatigue Crack ◽  
Finite Elements ◽  
Plastic Zone ◽  
Crack Closure ◽  
Crack Front ◽  
Numerical Study ◽  
Load Level ◽  
Specimen Thickness ◽  
Aluminum Specimen ◽  
Front Curvature

This paper presents a numerical study of the influence of the load level and the crack front curvature on the plastic zone in the area close to the crack front. The aim of the work is to determine the influence of these parameters on fatigue crack closure. For this, a CT aluminum specimen has been modelled tri-dimensionally and several finite elements calculations have been made considering a large combination of the variables under consideration.

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