Nano-filler added Fiber Reinforced Plastics (FRPs) exhibit superior material properties over conventional FRPs in terms of strength and stiffness. Particularly, Multi-Walled Carbon Nanotubes (MWCNTs) added GFRPs(Glass) shown better physical and mechanical properties, owing to increase in usage of all stuructural and non-structural applications. Performing drilling operations on MWCNTs-GFRP nanocomposties is really a challenging task due to their non-homogeneity and anisotropic behavior, which directs to generation of material damages. The prime focus of current work is to identify the suitable process parameters for enhancing the performance of drilling of GFRP nanocomposites. In this study, the drilling experiments are conducted on 0.3 wt.% MWCNT-GFRP nanocomposites with solid carbide, TiCN and TiAlN coated drills (6mm diameter) under dry and chilled air cutting environments. The dry drilling experiments are conducted without any assistance of cooling fluid in ambient condition. The chilled air at a temperature of 3ºC was supplied from the vortex tube.

ANOVA (balanced) analysis is performed with drilling experimental data to understand the effect of cutting parameters on output responses. The cutting parameters such as feed rate, spindle speed and tool type (coating) are considered as input and the measured thrust force, delamination factor and Acoustic Emission (AE) RMS signal are treated as output responses. From ANOVA results, it is observed that the influence of feed rate is more on output responses as compared to spindle speed. The relevant coefficients of determination (R^2^) are found to be much higher confidence level (>90%) for all cutting environments.

Based on experimental data, the thrust force and torque are decreased at lower feed rate and higher spindle speed for the selected drill tools and cutting environments. The thrust force decrement is 134% under chiller air cutting environment at 10 mm/min and 1500 RPM with TICN coated drill. Similarly, the torque decrement is 42% under same cutting conditions of thrust force. The lowest thrust force and torque values are noted as 12.61 N and 0.152 N-m respectively at lower feed rate (10 mm/min) and higher spindle speed (1500 RPM) using TiCN coated drill under chilled air cutting environment. The delamination factor is also low (1.025) under the same cutting conditions of minimum cutting forces. A good correlation exists between the thrust force vs. delamination factor (>0.85) and the delamination factor vs. AE RMS signal (>0.80) for the selected cutting environments. The recommended range of RMS voltage is 0.083 to 0.121 volts for producing the delamination free holes on GFRP nanocomposties.


Effect of Cutting Environments on Drilling Induced Damage in GFRP Nanocomposites

Division / Sponsors: 
Aerospace, Bioengineering, Applied Mechanics, Design Engineering Division, Advanced Energy Systems, Manufacturing Engineering Division, Noise Control and Acoustics, Nondestructive Evaluation, Diagnosis, and Prognosis (NDPD), Nuclear Engineering Division, Process Industries Division, Fluids Engineering, Heat Transfer, Materials, Microelectromechanical Systems, Safety Engineering and Risk Analysis, Computers & Information in Engineering


Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2020/volume/84478

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