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<p>This research paper presents the drilling performance of novel Carbon-Innegra (CI) fiber–reinforced polymer composites. CI fiber–reinforced composites are manufactured by the compression molding technique. Drilling experiments on CI composites were conducted based on Taguchi’s experimental design involving sixteen different combinations of machining trials. CI composites were drilled with different parameters such as speed 750&#xa0;rpm, 1500&#xa0;rpm, 2250&#xa0;rpm, and 3000&#xa0;rpm; feed rate 30&#xa0;mm/rev, 60&#xa0;mm/rev, 90&#xa0;mm/rev, and 120&#xa0;mm/rev, and with the solid carbide drill tool of 8&#xa0;mm diameter. Drilling performance of the CI composites is estimated from the five different measured responses, such as thrust force, torque, delamination (at the entry and exit), and surface roughness. Optimal drilling parameter combinations of the CI composites are determined based on Entropy-TOPSIS, a hybrid multi-attribute decision-making methodology (MADM). The weights of each of the five machining responses are estimated by the Entropy technique, and further, the optimal solution is determined from the TOPSIS methodology. From the optimization methodology, it is determined that the experimental trial 8 with speed 1500&#xa0;rpm and feed rate 120&#xa0;mm/rev exhibits the best results with good surface quality, minimum delamination around the hole surface, and the nominal values of thrust force and torque. The confirmatory tests performed with the determined optimal solution agree well with the experiments, with lesser variation of 0.124% for exit delamination, 0.81% for surface roughness, 0.191% for entry delamination, 3.73% for torque, and 10.78% for thrust force. Among the machining parameters, spindle speed highly influences thrust force; surface roughness and torque exhibit a non-linear relationship with the drilling parameters and are highly influenced by the forces and the temperature generated while drilling. Delamination at the entry and exit is highly influenced by the speed, feed rate, and drilling tool. This research work on the drilling of CI composites provides the scope and insights on hybrid composites as alternative materials for aerospace products and other lightweight structural applications.</p>

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Multi-attribute optimization of drilling Carbon-Innegra fiber–reinforced composites using Entropy-TOPSIS

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Arun Ramnath Ramachandran,
  • Vinod Ayyappan,
  • Vijay Raghunathan,
  • Gaurav Arora,
  • Papiya Bhowmik,
  • Sanjay Mavinkere Rangappa,
  • Suchart Siengchin

摘要

This research paper presents the drilling performance of novel Carbon-Innegra (CI) fiber–reinforced polymer composites. CI fiber–reinforced composites are manufactured by the compression molding technique. Drilling experiments on CI composites were conducted based on Taguchi’s experimental design involving sixteen different combinations of machining trials. CI composites were drilled with different parameters such as speed 750 rpm, 1500 rpm, 2250 rpm, and 3000 rpm; feed rate 30 mm/rev, 60 mm/rev, 90 mm/rev, and 120 mm/rev, and with the solid carbide drill tool of 8 mm diameter. Drilling performance of the CI composites is estimated from the five different measured responses, such as thrust force, torque, delamination (at the entry and exit), and surface roughness. Optimal drilling parameter combinations of the CI composites are determined based on Entropy-TOPSIS, a hybrid multi-attribute decision-making methodology (MADM). The weights of each of the five machining responses are estimated by the Entropy technique, and further, the optimal solution is determined from the TOPSIS methodology. From the optimization methodology, it is determined that the experimental trial 8 with speed 1500 rpm and feed rate 120 mm/rev exhibits the best results with good surface quality, minimum delamination around the hole surface, and the nominal values of thrust force and torque. The confirmatory tests performed with the determined optimal solution agree well with the experiments, with lesser variation of 0.124% for exit delamination, 0.81% for surface roughness, 0.191% for entry delamination, 3.73% for torque, and 10.78% for thrust force. Among the machining parameters, spindle speed highly influences thrust force; surface roughness and torque exhibit a non-linear relationship with the drilling parameters and are highly influenced by the forces and the temperature generated while drilling. Delamination at the entry and exit is highly influenced by the speed, feed rate, and drilling tool. This research work on the drilling of CI composites provides the scope and insights on hybrid composites as alternative materials for aerospace products and other lightweight structural applications.