Faculty Publications

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Subject: search.filters.subject.Carbon fiber reinforced plastics

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    Performance enhancement of preloaded RC beams using CFRP sheets
    (CAFET INNOVA Technical Society cafetinnova@gmail.com 1-2-18/103, Mohini Mansion, Gagan Mahal Road, Domalguda, Hyderabad 500029, 2012) Prashanth, M.H.; Suraj, K.; Babu Narayan, K.S.; Ravikumar, C.M.
    Retrofitting concrete structures with Carbon Fiber Reinforced Polymer (CFRP) has grown widely in most parts of the world today. The main reason for the wide spread application of FRP is that it is possible to obtain an effective strengthening with a relative small work effort. Furthermore it is possible to carry out strengthening work without changing the current appearance or dimension of the structure. To strengthen and increase the ductility of the structure, CFRP has become an innovative material in to the field of structural strengthening and rehabilitation. In the present experimental investigation, RC beams were preloaded up to 0 to 50% of the ultimate capacity and were applied with CFRP sheets at the soffit of the beams were compared with control beam. The Load vs deflection, and crack mechanism are studied. The use of CFRP sheets in the soffit of the beam has resulted in enhanced strength and ductility. © 2012 CAFET-INNOVA TECHNICAL SOCIETY.
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    Experimental investigation of RC frames using CFRP sheets
    (2013) Prashanth, M.H.; Babu Narayan, K.S.; Venkataramana, K.; Sajith, M.
    Reinforced Concrete frames are the main load resisting systems used in practice all over the world. These frames will be subjected to sway, due to lateral loading most of the times by either earthquake or wind. Ductility and energy dissipation capacity of the frame are the key parameters for better performance under the action of the sway loading. Retrofitting using the new generation material such as carbon fiber reinforced plastic sheets (CFRP) shows much enhancement in these properties of laterally loaded frames. Frames subjected to lateral loading introduce collapse mechanism due to the formation of the plastic hinges at critical hinge locations. An experimental investigation of partially and fully CFRP wrapped reinforced concrete (RC) frames when compared to conventional(bare) frame has been carried out, to bring out the importance of critical engineered locations to be wrapped. © 2013 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.
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    Soft computing techniques during drilling of bi-directional carbon fiber reinforced composite
    (Elsevier Ltd, 2016) Shetty, N.; Herbert, M.A.; Shetty, R.; Shetty, D.S.; Vijay, G.S.
    Due to the intricacy of machining processes and inconsistency in material properties, analytical models are often unable to describe the mechanics of machining of carbon fiber reinforced polymer (CFRP) composites. Recently, soft computing techniques are used as alternate modeling and analyzing methods, which are usually robust and capable of yielding comprehensive, precise, and unswerving solutions. In this paper, drilling experiments as per the Taguchi L27 experimental layout are carried out on bi-directional carbon fiber reinforced polymer (BD CFRP) composite laminates using three types of drilling tools: high speed steel (HSS), uncoated solid carbide (USC) and titanium nitride coated SC (TiN-SC). The focus of this work is to determine the best drilling tool that produces good quality drilled holes in BD CFRP composite laminates. This paper proposes a novel prediction model 'genetic algorithm optimised multi-layer perceptron neural network' (GA-MLPNN) in which genetic algorithm (GA) is integrated with Multi-Layer Perceptron Neural Network. The performance capability of response surface methodology (RSM) and GA-MLPNN in prediction of thrust force is investigated. RSM is also used to evaluate the influence of process parameters (spindle speed, feed rate, point angle and drill diameter) on thrust force. GA is used to optimize the thrust force and its optimization performance is compared with that of RSM. It is observed that the GA-MLPNN is better predicting tool than the RSM model. The investigation in this paper demonstrates that TiN-SC is the best tool for drilling BD CFRP composite laminates as minimum thrust force is developed during its use. © 2016 Elsevier B.V. All rights reserved.
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    Numerical modelling and analytical comparison of delamination during cryogenic drilling of cfrp
    (MDPI, 2021) Balan, A.S.S.; Kannan, C.; Jain, K.; Chakraborty, S.; Joshi, S.; Rawat, K.; F Alsanie, W.F.; Thakur, V.K.
    Carbon-Fibre-Reinforced Polymers (CFRPs) have seen a steady rise in modern industrial applications due to their high strength-to-weight ratio and corrosion resistance. However, their potential is being hindered by delamination which is induced on them during machining operations. This has led to the adoption of new and innovative techniques like cryogenic-assisted machining which could potentially help reduce delamination. This study is aimed at investigating the effect of cryogenic conditions on achieving better hole quality with reduced delamination. In this paper, the numerical analysis of the drilling of CFRP composites is presented. Drilling tests were performed experimentally for validation purposes. The effects of cooling conditions and their subsequent effect on the thrust force and delamination were evaluated using ABAQUS/CAE. The numerical models and experimental results both demonstrated a significant reduction in the delamination factor in CFRP under cryogenic drilling conditions. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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    Exemplary approach using tool rotation-assisted µ-ECDM for CFRP composites machining
    (Taylor and Francis Ltd., 2023) Bhargav, K.V.J.; Balaji, P.S.; Sahu, R.K.; Katiyar, J.K.
    Carbon fiber-reinforced polymer (CFRP) composites are an advanced composite material class due to their remarkable properties such as high load-carrying capacity and low density. CFRP composites have enormous applications in aerospace, biomedical, automobile, etc. Machining the CFRP composite is need of the day, but issues like delamination, fiber pullouts, workpiece damage, etc. have made it difficult. These limitations can be surpassed by the micro-electrochemical corona discharge machining (µ-ECDM) process. Although the process has showcased high process capability and great versatility in machining conducting and non-conducting materials, the process has limitations in machining holes deeper than 300 µm because of insufficient electrolyte supply at the machining zone. Aiding assistance to the process can overcome the limitation by enhancing electrolyte availability. Therefore, an experimental analysis is carried out by generating through holes on the CFRP composite using a tailor-made rotating tool-assisted micro-electrochemical corona discharge machining (RT-µ-ECDM) system. The process parameters, voltage, concentration, duty factor, and tool rotation rate are taken at three levels. The materials removal rate and overcut as machining characteristics were analyzed. The multi-response optimization using JAYA algorithm and R-method is used to obtain the optimal process parameters. The experimental investigation suggests RT-µ-ECDM system can machine through holes on CFRP composite. © 2022 Taylor & Francis.
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    Load- and time-dependent three-body abrasive wear in short carbon fiber- and cenosphere-reinforced polymer composites using machine learning approach
    (Springer Science and Business Media Deutschland GmbH, 2025) Mahesh, V.; Mahesh, V.; Joladarashi, S.; Madhu, N.; Manoj, T.U.; Meghana, D.; Sinchana, K.V.
    This study investigates the load and time-dependent three-body abrasive wear behavior and surface morphology of polymer composites reinforced with varying proportions of short carbon fiber (Cr) and cenosphere (C) inclusions. Composites with different Cr and C reinforcements—Cr0C0, Cr0C20, Cr20C0, Cr15C5, Cr10C10 and Cr5C15—were subjected to wear tests under loads of 20, 30, and 40 N over exposure times of 5, 10, and 15 min. Mass loss and specific wear rate were evaluated to understand the influence of reinforcement composition and test parameters on wear performance. Surface morphological studies using scanning electron microscopy (SEM) revealed distinct wear mechanisms across composites. The Cr10C10 and Cr15C5 composites demonstrated the lowest specific wear rates of 9.42 × 10–9 and 8.67 × 10–9 m3/Nm, respectively, under a 40 N load at 10 and 15 min, correlating with smoother worn surfaces and fewer micro-cracks. In contrast, the Cr0C20 composite displayed the highest specific wear rate (5.14 × 10–8 m3/Nm) at a 40 N load for 5 min, with SEM images showing more extensive matrix erosion and cenosphere pull-out. The inclusion of cenospheres at higher ratios increased mass loss, especially in high-load conditions, while balanced Cr–C reinforcements (e.g., Cr15C5 and Cr10C10) provided enhanced abrasion resistance and minimized surface damage. These findings underscore the potential for optimizing Cr and C inclusion ratios to develop wear-resistant polymer composites suitable for demanding structural applications. © Iran Polymer and Petrochemical Institute 2025.