Elamvazhudi.B
@ifet.ac.in
Associate Professor/ Mechanical Engineering
IFET College of Engineering
Scopus Publications
Scopus Publications
B. Elamvazhudi and S. Gopalakannan
ASTM International
B Elamvazhudi and S Gopalakannan
SAGE Publications
Optimizing the impact properties of polymer composites is essential in aircraft industries. Hybridization of fibres is one of the efficient methods to enhance the impact properties of polymer composites. Dispersion of nanoparticles into epoxy resin improves the toughness of composites. This study examines the low-velocity impact (LVI) behaviour of hybrid epoxy-based carbon/glass fibre-reinforced laminates. Initially, the epoxy resin was modified with 0, 0.5, 1, 1.5, and 2 wt% of nanoclay and TiO2 nanoparticles using mechanical stirring followed by an ultrasonication method. To investigate the influence of stacking sequences, laminates were fabricated with (90 G/0 G/90 C)S, (90 G/0 C/90 G)S, and (90 C/0 G/90 G)S. The samples used for this study are six-ply symmetric laminates. Laminates were impacted with different impact energies between 30 and 80 J with an impact velocity of 7 m/s to generate damages. The residual strength of damaged specimens is determined using compression after the impact test. The order of stacking, fibre orientation, and the presence of nanoparticles all have a significant impact on the residual strength of laminates. By using C-scan images, layer-wise damage mechanisms were identified. The specimen with (90 C/0 G/90 G)S sequence has very high damage resistance compared to other laminates.
B. Elamvazhudi, V. Velmurugan, P. Hemalatha, and K. Dhinesh
Springer Nature Singapore
B. Elamvazhudi and Digvijay Boodala
Elsevier BV
B. Elamvazhudi, S. Gopalakannan, and Mohamed Ashif
AIP Publishing
B Elamvazhudi and S Gopalakannan
IOP Publishing
Abstract Incorporating nanofillers in epoxy resin is a novel approach to improve the mechanical properties of polymer composites. Recent studies discloses that the inclusion of nanofillers such as SiC, CNT, alumina and nanoclay into epoxies at micro and nanoscale levels enhances the mechanical properties of epoxies. In this research, the improved mechanical properties of nanoclay modified carbon/glass fibre-reinforced polymer nanocomposite (FRPNC) were investigated. The neat DGEBA epoxy resin was modified with nanoclay at different wt % (0.5- 2wt %) by ultrasonication process for achieving better dispersion of nanofillers. The modified polymer laminates were fabricated with unidirectional carbon/glass fibres with the stacking sequences of (0°G/0°G/0°C)S using hand lay-up process. The mechanical properties such as mode III delamination toughness, tensile strength and flexural strength were investigated using servo controlled hydraulic universal testing machine and 3-point bending test setup respectively. The highly cross linked structure between epoxy and nanoclay particles improves the mode III fracture toughness, tensile and flexural properties. The damage mechanisms of fractured specimens are characterised by SEM images.
Elamvazhudi B and Gopalakannan S
IOP Publishing
Abstract Nanofillers dispersion in polymeric matrix has been identified as a novel method to enhance the mechanical properties of Fibre Reinforced Polymer Nanocomposites (FRPNCs). In general, addition of nanofillers in polymeric resin improves the fracture toughness, tensile and other properties of polymer composites. On the other hand, this inclusion significantly reduces the stiffness, strain at rupture and thermal properties. To overcome these limitations, hybrid nanofillers have been introduced in polymer composites. This work aims to investigate the effect of addition of hybrid nanofillers (Nanoclay-TiO2) on mode I interlaminar fracture toughness (GIC), tensile as well as flexural characteristics of carbon/glass/epoxy based composites. The pristine epoxy resin was modified with nanoclay and nanoscale TiO2 nanofillers together with different weight percentages (0.5, 1, 1.5 & 2 wt%) using mechanical stirrer followed by sonication process. The modified epoxy based carbon/glass polymer laminates were fabricated using hand lay-up process. The lay-up sequence considered in this study was (90 °C/90 °G/0 °G)S, (90 °G/0 °G/90 °C)S and (90 °G/0 °C/90 °G)S. The mechanical properties of modified laminates were characterized by DCB test, tensile and three point bending test. The experimental results show that the addition of hybrid nanofillers in epoxy resin increased the mode I interlaminar fracture toughness (GIC) by 77% at 1.5 wt%, tensile strength by 31% at 1.5 wt%, and flexural strength by 33% at 2 wt%. Further addition of nanofillers (<2 wt%) decrease the mechanical properties of FRPNCs as a result of matrix embrittlement. The toughening mechanisms such as fibre pull-out, fibre breaking, particles debonding, and crack deflection were identified at the fractured surfaces.
B. Elamvazhudi, , S. Gopalakannan, and
Blue Eyes Intelligence Engineering and Sciences Engineering and Sciences Publication - BEIESP
Theoretically predicting the service life of the Fiber Reinforced Polymer (FRP) laminates is important to design safe structural components. In common, failure of FRP laminates includes fiber/matrix cracking, delamination of fibers, debonding of reinforcement materials, and matrix failure due to stress gradients. Conventionally failure envelops of the FRP laminates are strongly depends upon maximum stress criterion and normal strain criterion. This review paper reveals the all the failure prediction theories based on stress and strain induced in laminates. This article covers the recent well established failure prediction theories and common modeling approaches of fiber reinforced polymer composites.
B. Elamvazhudi and S. Gopalakannan
Elsevier BV