Applied Engineering Letters

10-16

Authors: P. Venugopal, K.G. Saravanan, R. Thanigaivelan

SCImago Journal Rank 2021: SJR=0.175 SCImago Journal & Country Rank CWTS Journal Indicators 2021: SNIP=0.41 Vol.8, No.1, 2023: pp.10-16 Download full text in PDF PERFORMANCE ANALYSIS OF EDM ON GREY CAST IRON USING RSM AND TOPSIS METHOD Authors: P. Venugopal1 , K.G. Saravanan2 , R. Thanigaivelan3 1Muthayammal College of Engineering, Department of Mechanical Engineering, Rasipuram, India 2Sona College of Technology, Department of Mechanical Engineering, Salem, India 3AKT Memorial College of Engineering and Technology, Department of Mechanical Engineering, Kallakurichi, India https://doi.org/10.18485/aeletters.2023.8.1.2 Received: 11 December 2022 Revised: 11 February 2023 Accepted: 20 February 2023 Published: 31 March 2023 Abstract: Electro discharge machining (EDM) process is applied to machine hard and difficult to cut materials. In this research hard material namely, grey cast iron is used as a workpiece and copper electrode 2 mm in diameter is used for making holes through EDM process. The effect of input parameters such as pulse-on time (Ton), pulse off time (Toff), gap voltage (Vg) and current (I) on material removal rate (MRR) and tool wear rate (TWR) were studied. Based on Response Surface Methodology (RSM) analysis the gap voltage and pulse on time has significant impact on MRR and TWR respectively. The mathematical model is developed for MRR and TWR using RSM. Analysis of variance (ANOVA) shows that voltage has notable impact on MRR. Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) is used to estimate the best combination for higher MRR and lower TWR. Based on the analysis the estimated combination is pulse-on time of 45 μs, pulse-off time of 3 μs, gap voltage of 25 V and current of 10 A.

24-35

Authors: Le Dang Ha

Compromise Ranking of Alternatives from Distance to Ideal Solution (CRADIS) is a new MCDM method (discovered in 2022). It is built on a combination of three well-known methods, including Additive Ratio Assessment (ARAS), Measurement Alternatives and Ranking according to Compromise Solution (MARCOS), and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). This method has the advantage of being resistant to the rank inversion phenomenon. However, if only the available data normalization (DN) method in this method is used, this method will only be usable in some cases. This study investigated the suitability of twelve data normalization methods combined with the CRADIS method. The solutions in four cases of four different fields were ranked using these twelve combination methods. Using these methods, the ranked results were compared with those of other MCDM methods. Four DN methods were appropriate in combination with the CRADIS method. The application scope of CRADIS method can be extended when using this DN method.