Experimental analysis on surface roughness of nano-graphene mixed wire-electrical discharge machining for Nitinol SMA

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Abstract

Nitinol shape memory alloy (SMA) exhibits distinctive characteristics like biocompatibility, shape memory effect, Pseudoelasticity, high resistance to oxidation, superior functional stability. Owing to these superior properties, Nitinol SMA becomes favourable choice for automotive, actuators, biomedical applications, aerospace industries and micro-electromechanical systems (MEMSs). The traditional machining techniques for Nitinol SMA imposes multiple difficulties owing to its characteristics like high toughness, lower strain hardening effect, increased ductility, and improved chemical reactivity. Wire-Electric Discharge Machining (WEDM) through powder-mixed dielectric is one such technique which is mostly suitable for difficult-to-cut materials. In current study, pulse-on-time (Ton), pulse-off-time (Toff), current, nano-graphene powder concentration were designated as machining parameters while SR as response variable for the WEDM of nitinol SMA. Design of experiments (DOE) was employed to create the experimental matrix with total of 27 experiments to be performed. Analysis of variance (ANOVA) was employed to study the statistical analysis of the obtained results. Influence of machining variables on SR response has been investigated by using main effect plots. 3D surface plots were incorporated to understand the simultaneous effect of two variables on SR. Best parameter combinations for obtaining the lowest SR value was determined from the analysis. Authors believes that present work will be useful in the area of powder-mixed machining of Nitinol SMA.

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