Mechanics of Advanced Composite Structures

Mechanics of Advanced Composite Structures

Analysis & Optimization of Wire-EDM Parameters‎ for Dimensional Stability of AZ91 Based Al2O3p/SiCp Hybrid Composite

Document Type : Research Article

Authors
1 Research Scholar, Faculty of Mechanical Engineering, Institute of Technology, SRMU Lucknow, U.P., India
2 Professor, Faculty of Mechanical Engineering, Institute of Technology, SRMU, Lucknow, U.P., India
Abstract
The present work focuses on the primary objectives to analyse the dimensional stability of ‎machined samples through kerf width and taper angle. Further to optimize the process ‎parameters to obtain optimum results. The RSM-BBD approach has been used to design the ‎experiments. Mg-based metal matrix hybrid composite samples were prepared using the ‎stir casting process. Prepared samples are machined on a CNC wire-cut EDM. Matrix of Mg ‎alloy AZ91 (94%) and reinforcement of SiC (4%) and Al2O3 (2%) powder is selected. ‎Machined samples are observed for kerf width and taper angle calculations, followed by the ‎optimization of process parameters to obtain optimum kerf width and taper angle. An ‎optical microscope is used to measure the kerf width with 10x magnification. Top kerf ‎width (Tkw), bottom kerf width (Bkw), and taper angle have been calculated, and a ‎parametric plot is shown. Results obtained show that pulse on time and current is most ‎significant factors in obtaining the optimum values of output responses. Optimum values of ‎top kerf width and bottom kerf width are obtained at Ton = 18µs, Toff = 5µs, I = 3A & WS = ‎‎10.4m/s, and Ton = 18µs, Toff = 9µs, I = 3A & WS = 3.12m/s, respectively. Optimum value of taper angle is obtained at Ton = 30µs, ‎Toff = 7µs, I = 3A & WS = 10.4m/s.‎
Keywords
Subjects

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