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    FE analysis of FRP pressure vessel
    (Trans Tech Publications Ltd ttp@transtec.ch, 2019) Biradar, S.; Joladarashi, J.; Kulkarni, S.M.
    In this paper the main focus is on analyzing the effect of various parameters like winding angle, winding pattern and fiber volume fraction on the stresses generation in a composite pressure vessel using Finite Element (FE) approach. The present study makes use of three different composite materials namely GFRP (Glass Fiber Reinforced Plastic), CFRP (Carbon Fiber Reinforced Plastic) and AFRP (Aramid Fiber Reinforced Plastic). Further they are compared with metallic pressure vessel (LCS-Low Carbon Steel, Al 6061-T6-Aluminium 6061- T6) to assess their potentiality as a substitute to metallic pressure vessels. Based on Maximum Specific Stress (MSS) results observations it is concluded that optimum parameters suggested for fabrication of pressure vessel are winding angle ±55o, fiber volume fraction, Vf of 0.55 and winding pattern of ((±∅°2)/90°2/(±∅°2)). Following AFRP, CFRP and GFRP provides better performance when compared with LCS and Al 6061 T6 based on MSS value. Considering the availability, cost and application factors it can be concluded that GFRP can be conveniently used as substitute for metallic pressure vessels. © 2019 Trans Tech Publications, Switzerland
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    A comparative study of the behavior of CFRP and GFRP laminates in a plate specimen using modified virtual crack closure technique (MVCCT)
    (Elsevier B.V., 2019) Javagal, S.; Raju, J.; Venkataramana, K.
    The applications of polymer composites in aircraft industry have exponentially increased in the recent years due to their high strength to weight ratio. Presence of delaminations in composites is inevitable which affects the structural stability due to reduction in structural stiffness and strength. The degradation of a structural component depends on the geometric characteristics of delamination, nature of loading and material characteristics. Damage tolerance study is thus essential to determine the extent of degradation of the structure due to the presence of delamination. The present paper brings about a comparision between the behaviour of a standard plate specimen made up of Carbon Fibre Reinforced Polymer (CFRP) and Glass Fibre Reinforced Polymer (GFRP) laminates with circular delaminations of varying diameters and subject to compressive load. A constant compressive load in terms of initial displacements was applied on a quasi-isotropic square plate specimen of dimensions 200 mm x 200 mm with a thickness of 2.88 mm of both CFRP and GFRP configurations. A circular delamination was introduced at the centre of the plate and its diameter and position along the thickness direction were varied and studied. Using ABAQUS codes of practice, Strain Energy Release Rate (SERR) was computed. The principles of Modified Virtual Crack Closure Technique (MVCCT) was used to compute SERR. Delamination propagates when the computed mixed mode energy release rate exceeds the critical value, GC. Depending on the external loading and material properties, Total strain energy release rate, GT (GT=GI+GII+GIII) was used to predict growth of delamination. The onset of delamination growth was determined by plotting the values of (GT/GC) across various delamination sizes along the thickness of the plate and reported. © 2019 The Authors. Published by Elsevier B.V.
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    MOJAYA Coupled with R-method for Optimization of Machining Parameters Used in the Generation of Micro Holes on GFRP Composite Using an In-House Developed µ-ECDM System
    (Springer Science and Business Media Deutschland GmbH, 2023) Bhargav, K.V.J.; Shanthan, P.; Balaji, P.S.; Sahu, R.K.
    Glass fiber reinforced plastic is a highly versatile composite with properties such as high strength, flexibility, durability, stability, lightweight, and resistance to heat, temperature, and moisture. It is commonly used in automobiles, aerospace, construction, power generation, and manufacturing. Owing to these numerous applications, machining holes in GFRP composite has become the need of the day. This paper focuses on machining microholes in GFPR composite using an in-house developed µ-ECDM system. The process parameters selected for machining are voltage (V), concentration (wt%), and duty factor (DF), and the machining characteristics chosen are material removal rate (MRR) and overcut (OC). The machining parameters are optimized using the multi-objective JAYA algorithm coupled with the multi-attributed decision-making technique R-method to find the most favorable responses for machining GFRP composites. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Tribo-mechanical and physical characterization of filament wound glass/epoxy composites
    (Institute of Physics Publishing helen.craven@iop.org, 2019) Biradar, S.; Joladarashi, S.; Kulkarni, S.M.
    The present research aims to investigate mechanical, physical and tribological properties of filament wound Glass Fibre Reinforced Polymer (GFRP) composite pressure vessel as per respective ASTM standards. Here test coupons prepared from GFRP vessel are subjected to tensile, compression, flexural and impact testing to investigate mechanical properties. The physical properties are studied from density, ignition loss and water absorption tests. The tribological study was carried out using abrasive slurry erosion tester. All tests carried out in this study are as per respective ASTM standard. The results obtained from various mechanical testings are satisfactory and also almost equal in strength with respect to metallic pressure vessels. Particularly from impact testing, the strength of sea water treated sample has considerably increased. Fractography study was conducted on failed samples to study various mode of failure in detail. The physical characterization has elaborated the behavior of filament wound GFRP material under moisture environment which has observed a maximum of 0.5% water absorption rate. As per ignition loss study which reveals about 95%-98% weight of ignition loss is recorded, which indicates perfect fibre to resin ratio and almost nil or least % of void content. The slurry erosion test results are within the expected range and maximum wear of 9.67% is recorded under extreme case. The overall study reveals that the presence of voids, non-uniform distribution of fibre and matrix have an impact on the outcomes of many mechanical properties. From the above study we can conclude that filament wound GFRP pressure vessel can be used in many applications since it is a non-hydrophobic, better wear resistant and several strength parameters have also improved or unaltered under rigorous testing conditions. © 2019 IOP Publishing Ltd.