Vibration damping capability of electrical discharge machined surfaces: Characteristics, mechanism and application

Analysis on the Performance of Micro and Nano Molybdenum Di-Sulphide Powder Suspended Dielectric in the Electrical Discharge Machining Process—A Comparison

“…If R ku > 3, the surface profiles have many high peaks and valleys; consequently, R ku < 3, reveals surface profiles with low peaks and valleys [ 39 , 41 ]. A typical skewness–kurtosis envelope shows that, the EDM process is capable of producing surfaces with positive skewness and kurtosis around 3 [ 40 , 54 ]. From the experimental results ( Figure 18 ) it is perceived that, using MoS 2 powder-suspended dielectric, surfaces with negative skewness is easily obtainable at T d > 750 μs and I p = 0.5 A conditions for both Φ40 μm and Φ90 nm.…”

“…A minimum skewness of −1.4 is achieved at peak current of 0.5 A for Φ40 μm. Surfaces with negative skewness offer good bearing capacity and lubricant retention capacity [ 40 ]. By varying the discharge duration between 50–300 μs and gap voltage between 40–80 V, the kurtosis of the machined surface less than 3 is achieved.…”

“…By varying the discharge duration between 50–300 μs and gap voltage between 40–80 V, the kurtosis of the machined surface less than 3 is achieved. These machined surfaces offer good gripping and locking ability [ 39 , 40 , 41 ]. These results indicate that using PMEDM process tailor made surface texture can be produced on the machined surface by selecting appropriate discharge parameter combinations.…”

“…Vijaykumar et al [ 33 ] developed a 3D-axisymmetric model considering single-discharge phenomena [ 34 , 35 ] during the PMEDM process. The authors investigated characteristics such as surface crack density, skewness and kurtosis of machined surfaces to assess the functional performance of the components for various applications [ 36 , 37 , 38 , 39 , 40 , 41 ]. Arun Kumar et al [ 37 ] found that the magnetic field-assisted PMEDM process produces fewer surface cracks than normal EDM process and postulated that the discharge current and discharge duration are the most influencing parameters.…”

“…The authors identified that the average length and density of micro-cracks were lessened in the dry EDM compared to conventional EDM. Coelho and Koshy [ 40 ] attempted to explore the possibility of using EDM-machined inserts for passive vibration damping applications. It was reported that the damping ratio of EDM-machined inserts is doubled compared to the extruded insert due to the positive skewness and high kurtosis produced on machined surfaces.…”