Abstract
Carbon fiber reinforced plastic (CFRP) is a next-generation material tailored for lightweight engineering applications. This study investigates the process of laser percussion inclined hole drilling (LPIHD) in CFRP, using an infrared laser of millisecond pulse duration. Parametric analysis to analyze the effect of input parameters like laser current (I), pulse width (Pw), gas pressure (Gp), workpiece thickness (Ti), and angle of incidence (θ) on geometrical hole characteristics, i.e., hole circularity at the top (HCT), hole circularity at the bottom (HCB) and hole taper (HT) has been carried out for LPIHD using Nd: YAG laser. A second-order regression model for each output response is develop using the Box-Behnken approach (BBD) of response surface methodology (RSM) and parametric analysis performed using RSM plots. Both the single objective optimization (SOO) and multiobjective optimization (MOO) of the LPIHD process were carried out using the desirability approach of RSM. The hole was analyzed using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). It has been observed that LPIHD at high current (300 A) and high pulse width (6 ms) produce a hole with HCT (0.68), HCB(0.65), and HT (6.5°). CFRP of small thickness gives high HCT (0.8), HCB (0.8), and low HT (4°) at high current (300 A). The MOO using the desirability approach, produce a hole of HCT (0.9297), HCB (0.9138), and HT (0.1784). The SEM images reveal that hole produced at input parameters corresponding to MOO has better surface integrity than the hole corresponding to SOO of HCT.
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Acknowledgements
The authors would like to express their gratitude to Dr. B.N. Upadhyaya, Raja Ramanna Centre for Advanced Technology (RRCAT) Indore, India for providing the experimental facility for this research work. India, for providing the Nd: YAG laser machining system to conduct the experiments for this study.
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Mishra, Y.K., Mishra, S. & Jayswal, S.C. Parametric Analysis and Optimization of Inclined Laser Percussion Drilling of Carbon Fiber Reinforced Plastic Using Solid-State Nd: YAG Laser. Lasers Manuf. Mater. Process. 8, 325–354 (2021). https://doi.org/10.1007/s40516-021-00151-5
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DOI: https://doi.org/10.1007/s40516-021-00151-5