Suresh Kumar Chelliah

Bharath Institute of Higher Education and Research · School of Aeronautical Engineering

This work investigates the effect of iron filler to improve thermo-mechanical properties in vinyl ester polymer composites. The iron filler with 50 µm was extracted from the industrial iron waste by using ball milling machine. Different wt% of iron fillers such as 5, 10 and 15 were considered to fabricate the vinyl ester polymer composite samples....

The main limitations of using natural fibers reinforced unsaturated polyester (UPE) composites is poor impact damage behaviors. This work focuses to improve impact damage resistance and residual strength of needle punched banana and pineapple fibers UPE composites by hybridization and incorporating stainless steel (SS) mesh. Different configuration...

The main challenges of using fiberglass composites are poor impact resistance and understanding of damage mechanisms during loading. This work focuses on improving the indentation resistance of glass/epoxy composites by the incorporation of industrial waste iron fillers with maximum concentration of 50 µm in size. Moreover, the quasi-static indenta...

The main objective of this study is to enhance the interfacial adhesion between Kevlar fiber‐reinforced epoxy composite for a single lap joint. This has been achieved by performing various chemical treatments on Kevlar fiber. Moreover, the nanofiller‐added epoxy matrices were also used for investigating its potentiality in a single lap joint. A tho...

Composite structures with L, C, and T shape geometries are commonly used in the design of aerospace structural components. These complex structures are prone to delamination failure at the curved region. This study investigates the effect of thickness and recycled milled glass fiber fillers to improve the strength properties and delamination resist...

This work focuses on the investigation of impact damage resistance of basalt/epoxy, hemp/epoxy, and hybrid/epoxy composites under different temperatures of 30°C, 50°C, and 65°C. Unidirectional basalt and nonwoven hemp fibers were reinforced with LY556 epoxy resin using a hand layup technique. Mechanical, acoustical, and morphological analyses were...

This paper focuses on the experimental investigation on the effect of different fiber reinforcement phases and post-cure temperature to improve the strength recovery of adhesively bonded patch repair in glass/epoxy composite laminates. The repair was performed on the site of damaged region in the laminates by using various configurations of patches...

Abstract This research work focuses on the experimental investigation of indentation damage resistance and post-indented performance of different stacking sequence of glass/epoxy laminates using mechanical and acoustic responses. The laminates with stacking sequence, namely [0]12, [0/90]6S, [+45/-45]6S and [0/+45/-45/90]3S were subjected to normal...

This work investigates the effect of elevated temperature on quasi-static indentation response of glass/epoxy laminates. The glass/epoxy laminates with cross-ply [0/90]3S configuration were fabricated by hand lay-up technique and subjected to quasi-static indentation test at elevated temperature of 60°C and 90°C. Furthermore, the glass/epoxy lamina...

Laminated composites are prone to impact-induced damage during their service operations, which is significant to assess the extent of damage. This study proposes a framework to assess the intensity of impact-induced damage in composites using digital image correlation (DIC) technique. Initially, glass fibre-reinforced polymer (GFRP) composite speci...

The effect of needle-punch in banana/unsaturated polyester composites was investigated using acoustic emission (AE) signals. The failure mechanisms in random banana, glass and needle-punched banana fibers reinforced unsaturated polyester composites were studied. Tensile and flexural tests along with online AE monitoring were carried out on neat epo...

This work focuses on investigating the effect of interface fibre orientation with milled glass fillers on mode-II fracture toughness of [0°7/θ°//θ°/0°7] glass/epoxy laminates. The result reveals that the loading of 5 wt-% milled glass fillers in the epoxy matrix enhanced the interlaminar fracture toughness. Significantly, the filler-loaded samples...

The purpose of this work is to fabricate and analyse a light weight, recyclable, and non-toxic natural fiber reinforced industrial safety helmet. The fibers were extracted from agro-waste pseudostem of nendran variety banana plant. A facile needle punching technique was employed on banana fibers to produce a needle punched non-woven banana fiber fa...

This research work focuses to improve the interfacial adhesion in aramid/epoxy composites by various chemical treatments of aramid fiber surface. The effect of chemical grafting on the fiber surface was studied using X-ray diffractometer (XRD) and field emission scanning electron microscopy (FESEM). Also, short beam and microbond tests were carried...

Natural plant fiber-reinforced polymer composites have been in the limelight in the field of materials science for their mechanical properties, economy, and eco-friendliness. Properties of such novel composites depend on the adhesion and interaction between the fibers and the polymer matrix. Consequently, poor interaction can lead to declined mecha...

The effect of reinforcement phases on indentation resistance and damage behavior of glass/epoxy laminates was investigated in this research work. Woven glass fiber mat and nonwoven chopped glass fiber mat were used as fiber reinforcement phases for fabricating the laminates. Low-velocity impact and quasi-static indentation tests were performed on b...

The weak interfacial properties of kevlar/epoxy composites are the main limitation in applications. This work focuses to improve interfacial adhesion in kevlar/epoxy composites by various concentrations of phosphoric acid (PA) pre-treatment followed by Epichlorohydrin (ECH) treatment with different time periods. The fiber surface modification was s...

This study focuses on the evolution of a new biodegradable material sourced from agro-waste, and how it plays a vital role in replacing nonbiodegradable material. In the present work, new fibers were extracted from the pseudo stem of the Nendran variety of the banana plant. Initially, anatomical studies were carried out on raw fibers to investigate...

Some mathematical functions which can’t be solved analytically and the solution for these functions can be determined by the intersection of their graphical plots. Computer programmes represent these functions with discrete points which are not continuous in nature. Since the resolution of the discretization is limited, the graphs may intersect in...

This work focuses on the experimental investigation of indentation damage resistance in different stacking sequences of glass/epoxy composite laminates under cyclic loading on normal (0°) and oblique (20°) planes. The stacking sequence, such as unidirectional [0]12, angle ply [±45]6S, and cross ply [0/90]6S, were subjected to cyclic indentation loa...

Vibration measurement is essential for the study and testing of vibrating members, condition monitoring of industrial machines and control of vibration. Accelerometers are preferred for vibration measurement because it is compact size and the other two parameters velocity and displacement can be obtained by method of integration. Conventionally pie...

This research work focuses on investigating the effect of external patch repair and its sequence on quasi-static indentation (QSI) response of glass/epoxy laminates. The parent woven glass/epoxy laminates (Type-I) was repaired by using woven (W) and chopped (C) fibres with different patch sequence such as W/W/W/W (Type II), W/C/C/W (Type III), C/W/...

Electric cars are going to be the future of 21st century because the exponential growth of gasoline-based automobile engines resulted in emission of particulate matter and gases creating pollution and global warming. Composite materials gains importance in electric cars owing to light weight enhanced mechanical, thermal properties in comparison wit...

The glass fibre reinforced polymer (GFRP) composites are widely used in critical parts of the aircrafts. The inter-laminar and intra-laminar shear strength of GFRP laminated composite structures are weak due to presence of voids in matrix, tools dropping during maintenance, birds hitting, lightning strikes. This paper investigates the effect of kev...

This work focuses on the investigation of flexural strength in glass fiber reinforced (GFRP) composite laminates. Composite laminates with stacking sequence of [0º/90º] 14 were fabricated by hand lay-up technique. Laminates with pre-induced defects were introduced through fibre cut in the 7 th layer and the delamination between the 7 th and 8 th la...

The main objective of this paper is to carry out the buffeting analysis on aircraft wing. The analyses were done for various frequency values and the deformations were captured for the corresponding frequencies. Rectangular tapered wing was selected as the object of our study. This vibrational study helps us to understand about the sizing and desig...

This article investigates the effects of interface fiber orientation on the mode-I interlaminar fracture toughness, and the evolution of damage was monitored using acoustic emission technique. The results show that changing the interply fiber orientation improved the fracture toughness and delamination resistance significantly. The G IC initiation...

Automatic detection and quantification of damage in the composite structure are a vital requirement in the assessment of the overall structural integrity of modern aerospace systems. In this work, the indentation‐induced damage in the glass fiber‐reinforced polymer composite (GFRP) laminates is investigated using multilevel threshold‐based particle...

This work focuses on the evolution of a novel technique, employed to fabricate a plant fiber‐reinforced composites without any hazardous chemical treatment for alternative carcinogenic synthetic fiber‐reinforced polymer composites. The fibers were extracted from the agro‐waste pseudostem of banana plant. Anatomical studies were carried out on fiber...

This work relates to the investigation of indentation induced damage resistance in glass fiber reinforced polymer composite laminates under normal and inclined planes. Uni-directional [0] and cross-ply [0/90] glass fiber reinforced polymer composite specimens were subjected to 0° and 20° indentation loading with acoustic emission monitoring. The sp...

This paper investigates the effect of glass fibre orientation on the impact damage evolution and post-impact residual strength of glass/epoxy laminates, using mechanical and acoustic emission (AE) analysis. The glass fibre reinforced polymer (GFRP) composite laminates with stacking sequence such as 0°, 90°, [±45°] and [0°/90°] were tested. The inde...

The purpose of this study is to employ a novel technique for the fabrication of natural fiber reinforced polymer composites that could stand toe to toe with glass fiber composites in terms of thermo-mechanical properties without any chemical treatment. The reinforcement fibers were extracted from the pseudostem of the nendran banana plant. Later a...

This paper investigates the effect of glass fibre orientation on the impact damage evolution and post-impact residual strength of glass/ epoxy laminates, using mechanical and acoustic emission (AE) analysis. The glass fibrereinforcedpolymer(GFRP) composite laminates with stacking sequence such as 0°, 90°, [±45°] and [0°/90°] were tested. The indentati...

Aircraft is considered as the complex mechanical invention possessing flying capability. In the structural engineering field, the finest example for the minimum weight design is the structure of the airframe. This efficient design of airframe is achieved by the concept of strength of material approach. The two major parts of the wing is the fuselag...

This paper investigates the effect of temperature and hybridization on the impact damage evolution and post-impact residual strength of hemp/epoxy, basalt/epoxy and their hybrid laminates, using mechanical and acoustic emission (AE) based analysis. To start with, the specimens were impacted by a drop weight impact tower machine at two temperatures...

Fibre reinforced plastic (FRP) composites are being widely utilized in various industries because of their superior mechanical properties. Besides their advantages, failure of these composites can occur either by an individual or an associated of various failure modes which are very difficult to distinguish and discriminate the damages. This paper...

In this work, the strength of the composite material is tested and the damages are classified using supervised method. The image is obtained from the front and rear sides of the composite material after applying 5 mm, 6 mm and 7 mm impingement. Initially, the images are filtered using anisotropic diffusion filter. Global and local damages in the st...

In this article, to overcome the challenges encountered during the discrimination of various failure modes in post impacted/indented glass-fiber-reinforced plastic, techniques like pattern recognition method and advanced signal processing were employed. The significant acoustic emission parameters such as amplitude, rise time, counts, energy, durat...

In this work, the digital images of damaged composite materials are analysed using multi-level threshold methods and geometrical features. The image are obtained from the front and back side of the composite material after applying 5mm, 6mm and 7mm impingement. Initially, the images are filtered using median and anisotropic diffusion filter. The re...

The ageing effect of glass/epoxy composite laminates exposed to seawater environment for different periods of time was investigated using acoustic emission (AE) monitoring. The mass gain ratio and flexural strength of glass fiber reinforced plastic (GFRP) composite laminates were examined after the seawater treatment. The flexural strength of the s...

This paper focuses on the experimental investigation of impact damage resistance in hybrid composite laminates. In this case, the low velocity impact behaviour of quasi-isotropic glass/epoxy, glass/basalt/epoxy (G/B/G, B/G/B) and glass/carbon/epoxy (G/C/G, C/G/C) composite laminates was simulated by carrying out quasi-static indentation (QSI) tests...

Acoustic emission (AE) can be used for online monitoring of composite structures. One of the main issues of using composite structures in various applications is to understand and characterize their failure mechanisms. In this paper, advanced signal processing technique is used to discriminate the failure mechanisms in hemp/epoxy and glass/epoxy co...

The objective of this paper is to predict the failure load of the composite laminates during tensile loading using an online Acoustic Emission (AE) monitoring and Artificial Neural Network. Bidirectional glass/epoxy laminates were subjected to tensile loading. The laminates were made for 12 layers of bi-directional glass mat in an epoxy matrix. The...

Acoustic emission (AE) is widely used to characterize damage occurring in composite materials: however, the discrimination between AE signatures due to different damage mechanisms is still an open issue. In this study, the various failure mechanisms in bidirectional glass/epoxy laminates subjected to uni-axial tension are identified using AE monito...

The various failure mechanisms in bidirectional glass/epoxy laminates loaded in tension are identified using acoustic emission (AE) analysis. AE data recorded during the tensile testing of a single layer specimen are used to identify matrix cracking and fiber failure, while delami-nation signals are characterized using a two-layer specimen with a p...

The success of the acoustic emission based structural health monitoring technique depends on its ability to discriminate between valid acoustic emission signals and ambient noise. In addition, the technique should be able to identify the damage mode from the acoustic emission waveforms and parameters. So, Acoustic emission technique is very powerfu...