iosr-JMCE   Volume-10 ~ Issue-2

Abstract: Proper modeling of mould for an air cooler tank is necessary to facilitate the ease for production line and weight reduction of the complete component assembly. The present research work aims at performing the structural analysis separately on 3 different models of moulds designed: Model-1: Mould extracted from the Pro-E software manufacturing module (say Thickness ='t'). Model-2: Thickness reduced to half of the previous model for weight reduction. (t1= ½(t)) Model-3: Thickness reduced to half of the previous model for weight reduction. (t2= ¼(t)). The aim of the present work is to study the variation in displacement and stress values between Model-1, Model-2 and Model-3. This analysis is performed using FEM in ANSYS Software. The study is intended for appropriate reduction of thickness there by reducing the weight of complete assembly, which in turn reduces the complete cost of production of mould for an air cooler tank.

Keywords; ANSYS, Displacement, FEA, Stress

[1] "Machine design", T.V.Sundararajamoorthy, 2nd Edition 2010.

[2] Design data book: P.S.G.College of Technology (Kalaikathirachchagam).

[3] ANSYS Reference Manuals, 2012.

[4] Daniel I.M. and Ishai.O, "Engineering Mechanics of Materials", Second Edition, Oxford press, 2006.

Abstract: Superior performances of Self-Compacting Concrete (SCC) in fresh state to achieve a more uniform distribution encourage the addition of fibers in concrete which is a motivation for structural application of fibre reinforced concrete. Steel fibre used in the Self Consolidating Steel Fibre concrete (SCSFRC) is to enrich the performance of the concrete material. But SCC has intrinsic low ductility and poor toughness which restrict the fields of application of SCC. The disadvantage of SCC can be avoided by reinforcing with randomly distributed discontinuous fibers. Traditionally rational mix design method is available for SCC which make tedious to obtain the self compacting properties in various mix proportion of concrete. The mix design is based on principle of limiting range for total aggregate volume and coarse aggregate volume in concrete. It forms the basis for the concrete to be flowable and to achieve high workability. This paper focus on the design mix for SCSFRC, mix design principle and experimental investigation carried out on Self Consolidating Steel Fibre Reinforced Concrete (SCSFRC) fresh properties.

Keywords: SCSFRC Constituents, Mix design Principle,Applications –SCSFRC.

[1]. Hajime Okamura and Masahiro Ouchi (April 2003) "Self Compacting Concrete" - Journal of Advanced Concrete Technology, Japan Concrete Institute Vol 1 No. 1. pp 5-15
[2]. C. Parra, M. Valcuende, F. Gomez (2010) "Splitting tensile strength and modulus of elasticity of self-compacting concrete",Journal home page at Science direct.
[3]. M.Ramali and E.T. Dawood (2011) "Effect of Steel Fibres on the Engineering performance of Concrete", Asian Journal of Applied Science, Malaysia.
[4]. K. Turk, P. Turgut, M. Karatas, A. Benli ( September 2010 ) "Mechanical Properties of Self-compacting Concrete with Silica Fume/Fly Ash" 9th International Congress on Advances in Civil Engineering, Karadeniz Technical University, Trabzon, Turkey, pp 27-30.
[5]. "Specification and Guidelines for Self-Compacting Concrete" – EFNARC.

Abstract: The deterioration of reinforced concrete infrastructures as a result of the effect of Crude Oil spill on concrete structures particularly in the Niger Delta region of Nigeria has remained a great challenge to the engineering profession and the general public at large. Concrete interacts with substances within its environment. These interactions often have significant effect on the engineering properties of concrete made from ordinary Portland cement. Concrete specimens were prepared at 1:2:4 mix ratio and subject to three different curing media of concentrated crude oil, stimulated water/crude oil mix and potable water. The concrete specimens were cured in the media with environmental temperature of 25+20C and they were crushed at immersion ages of 7, 14, 21 and 28 days. The result obtained showed that different concentration of crude oil led to significant changes in the compressive strength of concrete made from ordinary Portland cement. This research also revealed that the rate of strength development is significantly low in the concentrated crude oil and crude oil/water mix curing media. Corrosion rate and chemical attack on concrete are high in the concentrated crude oil medium than in the crude oil/water mix as the reduction in compressive strength are in the ratio of 20:12. It was also observed that the three curing media led to increase in the compressive strength of concrete as the curing age increases.

Key words: Compressive strength, Concrete specimens, Curing age, Concrete structures, Immersion ages, Deterioration.

[1]. Daka, E.R and Ekweozo Ike, 2004. Effect of size on the Acute Toxity of Crude Oil to the mangrove oyster, caresostreagasar. Journal of applied science and environmental management, (8)2: 19 – 22.
[2]. Environmental Protection Agency (EPA), 2006. The Behaviour and Effects of oil spill on aquatic environment, EPA Office of Emergency and remedial response, USA.
[3]. Ejeh S.P and Uche O.A, U, 2009. Effect of crude oil spill of compressive Strength of concrete materials. Journal of applied science research 5 (10): 1756- 1761.
[4]. Jonnesari H. and Moshreaf A. 2005. The Bond between Repair materials and concrete substrate in marine environment, Asian Journal of Civil Engineering (Building and Housing) 6 (4): 267-272.
[5]. Kline, T.R., 2004. Sulfur Pit Assessment and Repair Strategies, Structural Preservation Systems inc, Houston, Texas, USA.
[6]. Memon, N.A., Sumadi S.R., Ramli, M. 2007. Performance of high workability Slag-cement mortar for ferrocement. Building and Environment; 2710- 2717.
[7]. Mouli, M., Khelafi, H. 2007. Properties of lightweight concrete made with Crushed natural pozzolana as coarse aggregate. Technology and Economic Development of Economy. Vol. XIII, No 4 Pp. 259-265.
[8]. Neville, A. M. (2000). Properties of Concrete. Pitman, New York, United States.
[9]. Udoeyo, F. F. and Dashibil, P. U. (2002). "Sawdust ash as concrete Material." Journal of Materials in Civil Engineering, 14(2), 173–176.

Abstract: The ultimate objective of the work is to increase the reliability of wind turbine blades through the development of the airfoil structure and also to reduce the noise produced during the running period of the wind turbine blades. The blade plays a pivotal role, because it is the most important part of the energy absorption system. Consequently, the blade has to be designed carefully to enable to absorb energy with its greatest efficiency. In this work, Pro/E, Hypermesh software has been used to design blades effectively. NACA 63-215 airfoil profile is considered for analysis of wind turbine blade. The wind turbine blade is modeled and several sections are created from root to tip with the variation from the standard design for improving the efficiency. For the further improvement required in the efficiency of the wind turbine the winglet is to be included at the tip of the blade which would help in increasing the efficiency and reducing the noise produced from the blades in working condition. The existing turbine blade and the modified blade with the winglet are compared for their results.

Keywords: Wind Turbine Blades, Airfoil, Computational Fluid Dynamics, Winglet, Noise

[1] Johansen, J. and Sorensen, N.N., "Numerical Analysis of Winglets on Wind Turbine Blades using CFD", EWEC 2007 Conference proceedings, Madrid, Spain, 2007.

[2] Karam Y, Hani M, "Optimal frequency design of wind turbine blades", Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 961–986.

[3] K.J.Jackson, et al., "Innovative design approaches for large wind turbine blades", 43rd AIAA Aerospace Sciences Meeting and Exhibit 10 - 13 January 2005, Reno, Nevada.

[4] Maughmer, M.D, "The Design of Winglets for High-Performance Sailplanes", AIAA 2001-2406, AIAA Applied Aerodynamics Conference, 19th, Anaheim, CA, June 11-14, 2001. [5] Mickael Edon, "38 meter wind turbine blade design, internship report"

[6] M. Jureczko, M. Pawlak, A. Mezyk, "Optimization of wind turbine blades", Journal of Materials Processing Technology 167 (2005) 463–471.

[7] Philippe Giguere and Selig, "Blade Geometry Optimization For The Design Of Wind Turbine Rotors" AIAA-2000-0045.

[8] Tingting Guo, Dianwen Wu, Jihui Xu, Shaohua Li, "The Method of Large-scale Wind Turbine Blades Design Based on MATLAB Programming", IEEE.

[9] Wang Xudong, et al., "Blade optimizations for wind turbines", Wind Energy. 2009; 12:781–803, Published online 29 April 2009 in Wiley Interscience.

[10] Z.L. Mahri, M.S. Rouabah, "Calculation of dynamic stresses using finite element method and prediction of fatigue failure for wind turbine rotor" Wseas Transactions On Applied And Theoretical Mechanics, Issue 1, Volume 3, January 2008.