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Frequency: 12 issues per year
ISSN: 2250–3005 (online version)
Published by: IJCER
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International Journal of Computational Engineering Research

(IJCER)

 

Articles

 

Research Article  open access
Jacobian-free Newton Multigrid method for Elastohydrodynamic line contact with grease as lubricant
Bharati M Shettar || P S Hiremath || N M Bujurke
INDIA
Paper Indexed : : 03.3005/xxxxxxx
International Journal of Computational Engineering Resaerch, Volume 06 ~ Issue 08 (August 2016)

Abstract

In this article, a Jacobian-free Newton Multigrid (JFNMG) method is used for the analysis of isothermal, steady state and incompressible Elastohydrodynamic lubrication (EHL) line contact problem. The lubricant is grease and its rheology is described by Hershel-Bulkley constitutive equation. The problem is investigated for smooth contact surfaces. A finite difference scheme, developed after discretizing governing equations on a uniform grid, is used for the solution of the EHL problem. The JFNMG method is applied to the system of algebraic equations, which arise in the scheme, and obtain solution for a wide range of parameters of interest. The proposed scheme not only overcomes the limitations of conventional schemes but is also, stable and fast converging for the investigation of the EHL problems.......

Keywords: Elastohydrodynamic lubrication, Grease lubricant, Jacobian-free, Multigrid, Full approximation scheme, Newton Inexact

 

Research Article  open access
Studying the Fatigue Properties Of Hardened For Carbon Steel
Dr. Mohammed Abdulraoof Abdulrazzaq
Iraq
Paper Indexed : : 03.3005/xxxxxxx
International Journal of Computational Engineering Resaerch, Volume 06 ~ Issue 08 (August 2016)

Abstract

In this study, Medium carbon steel is one of the most important materials used in industrial applications especially it is used in applications exposed to fatigue stresses such as airplanes, automotive components and electrical engines industries. Medium carbon steels were prepared and the effect of hardening on hardening strength of medium carbon steel was studied, the flame hardening method was used at different speeds then fatigue test was done. The following results were obtained, first sample (none), second sample (3.5 mm/s), and third sample (1.75 mm /s) and forth sample (1.165 mm/s). It has been found that as the flaming speed increases, the fatigue strength of the material decreases. The fatigue test result at stress (407.44 N/mm2) was as follow: for the first sample the no. of cycles to failure was at (67511 rpm), for the second sample (95832 rpm), for the third sample (122565rpm) and for the fourth sample it was (134585 rpm).

Keywords: Medium carbon steel, flame hardening, fatigue test.

 

Research Article  open access
Interrelation of Friction-Wear and Mechanism of Energy Dissipation for MEMS Application
Biswajit Bera
INDIA
Paper Indexed : : 03.3005/xxxxxxx
International Journal of Computational Engineering Resaerch, Volume 06 ~ Issue 08 (August 2016)

Abstract

Adhesion is a predominating force in Micro electro mechanical System (MEMS) due to high surface to volume ratio. In the present study of MEMS surfaces contact, adhesional friction force and adhesive wear volume have been computed numerically and new interrelation in between the wear and friction is developed after, finding their ratio. Also, mechanism of energy dissipation has been summarized on the basis of Arrhenius theory of mechanochemical reaction under working condition of MEMS devices.

Keywords: Friction force, Wear volume, Coefficient of friction-wear, Energy dissipation

 

Research Article  open access
Numerical Simulations on Triaxial Strength of Silty Sand in Drained Conditions
Ranga Swamy K || Shabna Alungal
INDIA
Paper Indexed : : 03.3005/xxxxxxx
International Journal of Computational Engineering Resaerch, Volume 06 ~ Issue 08 (August 2016)

Abstract

Silty sand deposits exhibit low bearing capacity at different density levels and depths. It may be due to low frictional values and non-plastic behaviour in nature. This study focuses on response of silty sand under drained conditions of triaxial testing using hypoplastic model. The influence of soil state parameters i.e. void ratio/relative density, and consolidation pressure level on drained response of silty sands is examined from the model simulations. The model results are displayed graphically in terms of stress-strain curves, stress paths and volume change-strain plots. The results reveal that the response of soil is dependent on both the combination of density and consolidation pressure levels.

Keywords: Silty sand, Hypo plastic model, drained response, volume change, consolidation, density, stress ratio

 

Research Article  open access
Comparison of Fatigue Characteristic for AISI 1039 Steel with Surface Treatment
Dr. Zeyad D. Kadhim || Dr. Mohammed Abdulraoof Abdulrazzaq || Sally M. Abd
Iraq
Paper Indexed : : 03.3005/xxxxxxx
International Journal of Computational Engineering Resaerch, Volume 06 ~ Issue 08 (August 2016)

Abstract

Wear and fatigue resistance in steel components used in various industries can be improved by surface treatments. Coatings systems which are used for improving the mechanical properties, generally, decreased the components fatigue life due to micro cracks, that propagate through the substrate , it is possible to improve the fatigue resistance of a component by the application of shot peening treatment, whose compressive residual stresses delay or eliminate the initiation and propagation of fatigue cracks. The aim of this study is to obtain the fatigue limit of untreated, shot peened, and hard chromium coating of medium carbon steel AISI 1039 and comparison between them. Fatigue tests were carried out using small samples with 4 mm diameter, with hard chromium layer of (47.1) μm thick.......

Keywords: Shot peening, fatigue, AISI 1039 medium carbon steel, chromium coating