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S. Pradeep

Bio: S. Pradeep is an academic researcher from Malnad College of Engineering. The author has contributed to research in topics: Microstructure & Friction stir processing. The author has an hindex of 9, co-authored 19 publications receiving 893 citations. Previous affiliations of S. Pradeep include Visvesvaraya Technological University & SRM University.

Papers
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Journal ArticleDOI
TL;DR: Various fabrication techniques employed for the production of natural fiber reinforced polymer composites are discussed and a detailed review of the research devoted to the analysis of their structure and properties by a variety of characterization techniques are presented.

957 citations

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TL;DR: In this paper, the authors present various extraction and chemical treatment methods and also provide the information of the fibers in terms of their physical and chemical properties, which make them easily replaceable to man-made fibers.
Abstract: Environmental friendly products are getting much attention nowadays because of their availability in abundance and their usability in many engineering applications. Natural fibers possess many unique properties which make them easily replaceable to man-made fibers. This review is envisioned to present the various extraction and chemical treatment methods and also focused on providing the information of the fibers in terms of their physical and chemical properties.

151 citations

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TL;DR: The present environmental regulations enforced by the government authorities have made the investigators around the globe to make use of more and more green materials particularly in composite syst... as mentioned in this paper, the authors of this paper
Abstract: The present environmental regulations enforced by the government authorities have made the investigators around the globe to make use of more and more green materials particularly in composite syst...

74 citations

Journal ArticleDOI
TL;DR: In this article, the effect of various chemical treatments on the mechanical, chemical structure, thermal and morphological behaviourof Phoenix pusilla fibres was investigated and the results revealed that chemical treatments helped in diminishing the amorphous content from the fibres, while the FTIR analysis clearly indicated the removal of many polar impurities.
Abstract: tPhoenix pusilla fibres (PPFs) were extracted from the leaves of a plant belonging to thefamily of Arecaceae, which is widely grown in Sri Lanka and Southern parts of India forsome medicinal purposes. Their use as possible reinforcement in hydrophobic polymericmatrix composites is yet to be studied and for this reason, the better understanding oftheir microstructure, chemical composition, and mechanical properties becomes essential.In this view, the present investigation deals with the study on the effect of various chemicaltreatments on the mechanical, chemical structure, thermal and morphological behaviourof PPFs. The chemical treatment of fibres was initially involved with NaOH and then fol-lowed by benzoyl peroxide, potassium permanganate and stearic acid solution at differentconcentrations for the suitable time interval. The results revealed that chemical treatmentshelp in diminishing the amorphous content from the fibres, while the FTIR analysis clearlyindicates the removal of many polar impurities. The increase in crystallinity index andcrystallite size was seen in all the modified fibres when compared with the raw ones. Theimproved thermal stability behaviour in all the chemically treated fibres was demonstratedby thermogravimetric and differential scanning calorimetry analysis. The tensile propertiesof the fibres were analyzed through ASTM standard and finally, the surface morphology wasanalyzed using scanning electron microscopy. All the favourable results indicated that thePPFs could be used in the applications of natural fibre composites.

72 citations

Journal ArticleDOI
TL;DR: In this article, two methods of friction-stir processing, intermittent multipass friction stir processing (IMP) and continuous multipass Stir Processing (CMP) were carried out, and their effect on the mechanical properties of the processed material was studied.
Abstract: Twelve-pass friction stir processing (FSP), with 50 pct overlap was carried out on aluminum alloy 5086-O rolled plates to obtain total area of 40 × 150 mm2. Two methods of friction-stir processing, intermittent multipass friction stir processing (IMP), and continuous multipass stir processing (CMP) were carried out, and their effect on the mechanical properties of the processed material was studied. The results revealed that material subjected to IMP showed better mechanical properties compared with the material subjected to CMP. Also, a variation in mechanical properties was observed with an increase in the tool traverse speed for single-pass, CMP, and IMP types of processing.

48 citations


Cited by
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Journal ArticleDOI
TL;DR: A detailed review of the different types of retting processes, chemical and surface treatments and characterization techniques for natural fibers, and major findings from the literature are summarized.

534 citations

Journal ArticleDOI
TL;DR: In this paper, the authors have reviewed the different sources of natural fibers, their properties, modification of natural fiber, the effect of treatments on natural fibers and their effective use as reinforcement for polymer composite materials.
Abstract: The increase in awareness of the damage caused by synthetic materials on the environment has led to the development of eco-friendly materials. The researchers have shown a lot of interest in developing such materials which can replace the synthetic materials. As a result, there is an increase in demand for commercial use of the natural fiber-based composites in recent years for various industrial sectors. Natural fibers are sustainable materials which are easily available in nature and have advantages like low-cost, lightweight, renewability, biodegradability and high specific properties. The sustainability of the natural fiber-based composite materials has led to upsurge its applications in various manufacturing sectors. In this paper, we have reviewed the different sources of natural fibers, their properties, modification of natural fibers, the effect of treatments on natural fibers, etc. We also summarize the major applications of natural fibers and their effective use as reinforcement for polymer composite materials.

441 citations

Journal ArticleDOI
TL;DR: In this article, a perspective review presents the advancement in the processing techniques, characterizations, future scope and methods to overcome the limitations in biofibers, biopolymers, biofilms, and bio composites.

405 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present an up-do-date review on natural fiber and resin types and sources, modification and processing techniques, physical and mechanical behaviors, applications, life-cycle assessment, and other properties of green composites.
Abstract: There has been much effort to provide eco-friendly and biodegradable materials for the next generation of composite products owing to global environmental concerns and increased awareness of renewable green resources. An increase in the use of natural materials in composites has led to a reduction in greenhouse gas emissions and carbon footprint of composites. In addition to the benefits obtained from green materials, there are some challenges in working with them, such as poor compatibility between the reinforcing natural fiber and matrix and the relatively high moisture absorption of natural fibers. Green composites can be a suitable alternative for petroleum-based materials. However, before this can be accomplished, there are a number of issues that need to be addressed, including poor interfacial adhesion between the matrix and natural fibers, moisture absorption, poor fire resistance, low impact strength, and low durability. Several researchers have studied the properties of natural fiber composites. These investigations have resulted in the development of several procedures for modifying natural fibers and resins. To address the increasing demand to use eco-friendly materials in different applications, an up-do-date review on natural fiber and resin types and sources, modification and processing techniques, physical and mechanical behaviors, applications, life-cycle assessment, and other properties of green composites is required to provide a better understanding of the behavior of green composites. This paper presents such a review based on 322 studies published since 1978.

393 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive understanding of the fundamentals of the microstructural evolution during FSW/P has been developed, including the mechanisms underlying the development of grain structures and textures, phases, phase transformations and precipitation.

390 citations