Author
Dharmendra Kumar Shukla
Other affiliations: Indian Institute of Technology Kanpur
Bio: Dharmendra Kumar Shukla is an academic researcher from Motilal Nehru National Institute of Technology Allahabad. The author has contributed to research in topics: Epoxy & Polymer nanocomposite. The author has an hindex of 6, co-authored 22 publications receiving 231 citations. Previous affiliations of Dharmendra Kumar Shukla include Indian Institute of Technology Kanpur.
Papers
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TL;DR: In this article, the effect of platelet volume fraction and functionalization of the platelets on the mechanical and fracture properties of the composites was investigated and it was observed that GPS coating of platelets improved the tensile strength of epoxy while retaining the improvements in elastic modulus and fracture toughness.
103 citations
TL;DR: In this article, platelet dispersion was observed through scanning electron microscopy (SEM) and the quasi-static plane-strain fracture toughness and tensile properties of the composites were determined for platelet volume fraction varying from 0% to 10%.
Abstract: Composites were prepared by dispersing Alumina platelets of polygonal shape having a thickness of 200 nm and size of 5–10 μm in epoxy (LY 556) matrix using sonication. Good dispersion of the platelets was observed through scanning electron microscopy (SEM). The quasi-static plane-strain fracture toughness and tensile properties of the composites were determined for platelet volume fraction varying from 0% to 10%. The results indicated that addition of the platelets give considerable improvement in fracture toughness and good improvement in the elastic modulus of epoxy. For 10% volume fraction of the platelets, the fracture toughness improved by 110% where as the improvement in elastic modulus was 78%. However there was an associated reduction of 53% in tensile strength and 73% in failure strain. SEM of fractured surface was carried out to understand the various mechanisms responsible for the improvement in fracture toughness. By appropriately accounting for the orientation and stacking effects of the platelets, the applicability of predictive models, such as the Halpin-Tsai and Mori-Tanaka, for estimating the composite modulus is demonstrated.
40 citations
TL;DR: In this article, the epoxy/alumina nanocomposite adhesives in bonded aluminium alloy joints were determined using a single lap joint and double cantilever beam.
Abstract: Lap shear strength and opening mode fracture toughness of epoxy/alumina nanocomposite adhesives in bonded aluminium alloy joints were determined using a single lap joint, and double cantilever beam...
27 citations
TL;DR: In this article, the effect of post-curing temperature on viscoelastic and flexural properties of epoxy/alumina polymer nanocomposite was evaluated in order to optimize the post curing temperature.
20 citations
TL;DR: In this article, two different types of alumina nanoparticles of two shapes, rod and spherical, were selected to synthesize nanocomposites by dispersing them in epoxy matrix by ultrasonication.
Abstract: Nanocomposites were synthesised by dispersing two different types of alumina nanoparticles in epoxy matrix by ultrasonication. Alumina nanoparticles of two shapes, rod and spherical were selected t...
19 citations
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TL;DR: In this paper, a comprehensive source of recent literature on epoxy structure, synthesis, modified epoxy, bio-epoxy resin, and its applications is presented, which also aims to cover the recent advances in natur...
Abstract: The versatile characteristic of epoxy and its diversity made it suitable for different industrial applications such as laminated circuit board, electronic component encapsulations, surface coatings, potting, fiber reinforcement, and adhesives. However, the pervasive applications in many high-performance field limited the epoxy use because of their delamination, low impact resistance, inherent brittleness, and fracture toughness behavior. The limitations of epoxy can be overcome by incorporation and modification before their industrial applications. Currently, modified epoxy resins are extensively used in fabrication of natural fiber-reinforced composites and in making its different industrial products because of their superior mechanical, thermal, and electrical properties. Present review article designed to be a comprehensive source of recent literature on epoxy structure, synthesis, modified epoxy, bio-epoxy resin, and its applications. This review article also aims to cover the recent advances in natur...
263 citations
TL;DR: In this article, the effect of water absorption on the mechanical and physical properties of reinforced cellulose fiber reinforced epoxy composites was investigated and the results showed that flexural strength, flexural modulus, fracture toughness and impact strength increased as the fibre content increased.
226 citations
TL;DR: In this paper, the authors investigated the effect of water absorption on the mechanical properties of nano-filler reinforced epoxy nanocomposites as well as to study the influence of different types of nanofillers such as nano-clay platelets, halloysite nanotubes (HNTs) and nano-silicon carbide (n-SiC) particles on the water absorption behavior of epoxy based nanocom composites.
210 citations
TL;DR: In this article, the effects of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties of epoxy/MWCNT nano-composites were studied with emphasis on fracture toughness under bending and shear loading conditions.
153 citations
TL;DR: In this article, the effect of water absorption on the physical and mechanical properties of the reinforced epoxy/clay nanocomposites was investigated, and it was shown that water absorption severely damaged the cellulose fibres and the bonding at fibres-matrix interfaces.
Abstract: Recycled cellulose fibre (RCF) reinforced epoxy/clay nanocomposites were successfully synthesized with different weight percentages (0%, 1%, 3% and 5%) of organoclay platelets (30B). The objective of this study was to investigate the effect of water absorption on the physical and mechanical properties of the RCF reinforced epoxy/clay nanocomposites. TEM images indicated a well-intercalated structure of nanoclay/epoxy matrix with some exfoliated regions. Water absorption was found to decrease as the clay content increased. The flexural strength, flexural modulus and fracture toughness significantly decreased as a result of water absorption. However, the properties of impact strength and impact toughness were found to increase after exposing to water. The addition of nanoclay slightly minimized the effect of moisture on the mechanical properties. SEM images showed that water absorption severely damaged the cellulose fibres and the bonding at fibres–matrix interfaces in wet composites.
124 citations