Contents of Journal of Mechanical Engineering 63, 1 (2012) 



                                                                       
KUGLER, S., MURIN, J.: Evaluation of effective elastic properties 
of FGM or multilayer structures                                          1                                                      

SIVAKUMAR, K., NATARAJAN, E., KULASEKHARAN, N.: Gas turbine blade
cooling at mid-chord region by using rib turbulators - review           21

GOPALAKANNAN, S., SENTHILVELAN, T., KALAICHELVAN, K.: Modelling 
and optimization of EDM process parameters on machining of  
Al 7075/SiC metal matrix composite by applying Response Surface 
Method                                                                  37



Abstracts



Evaluation of effective elastic properties of FGM or multilayer structures

S. KUGLER, J. MURİN

Structures made of Functionally Graded Materials (FGMs) or multilayer systems show a gradual or discontinuous variation of Young's modulus in thickness direction. An efficient analysis of elastic mechanical quantities using structural finite elements requires the evaluation of effective elastic properties such as the effective moduli for membrane and bending deformations and the shear correction factor. In order to decouple membrane and bending action in case of unsymmetrical distributions of Young's modulus throughout the thickness direction the location of a neutral surface has to be evaluated.


Gas turbine blade cooling at mid-chord region by using rib turbulators - review

K. SIVAKUMAR, E. NATARAJAN, N. KULASEKHARAN

The use of the rib turbulators is an effective technique to enhance the rate of heat transfer to gas flow in the gas turbine blades. A number of geometric parameters have been investigated on the heat transfer, flow characteristics and pressure drop of internal blade cooling of gas turbine blade. In this paper, an attempt has been made to review on how the geometrical parameters of channel shape, rib shape, rib orientation and rib spacing will affect the heat transfer rate and pressure drop in a gas turbine internal blade cooling.


Modelling and optimization of EDM process parameters on machining of Al 7075/SiC
metal matrix composite by applying Response Surface Method

S. GOPALAKANNAN, T. SENTHILVELAN, K. KALAICHELVAN

The newly engineered metal matrix composite (MMC) of aluminium 7075 reinforced with 10 wt.% of SiC particles were prepared by stir casting method. Electrical discharge machining (EDM) was employed to machine MMC with copper electrode. The experiment plan adopted face centered central composite design of response surface methodology. Analysis of variance was applied to investigate the influence of process parameters and their interactions, viz. pulse current, gap voltage, pulse on time and pulse off time, on material removal rate (MRR), electrode wear ratio (EWR) and surface roughness (SR). The objective was to identify the significant process parameters that affect the output characteristics. Further a mathematical model has been formulated by applying response surface method in order to estimate the machining characteristics such as MRR, EWR and SR.