Tamilselvam Nallusamy - Academia.edu (original) (raw)

Papers by Tamilselvam Nallusamy

Silicon, Jan 24, 2020

Alumina and Silicon Carbide based composites are routinely used in mechanical, automobile, cerami... more Alumina and Silicon Carbide based composites are routinely used in mechanical, automobile, ceramic and aerospace industries with numerous reinforcements. Reinforcements increase the physical, chemical, mechanical, thermal and tribological properties and make Al 2 O 3 -SiC suitable for a specific application. In this research, Titanium Boride powder of average size 95 nm reinforced into Al 2 O 3 -SiC nano-composite to enhance the thermal stability. The Al 2 O 3 -SiC nano-composite with 5, 10, 15 and 20 vol.% TiB 2 were fabricated through pressureless sintering under an argon atmosphere at 1600 °C. The high-temperature thermal stability of Al 2 O 3 -SiC-TiB 2 nano-composite was analyzed through the thermo-gravimetric analyzer (TG/DTA) with a warming rate of 10 °C/min and compared with Al 2 O 3 -SiC. A strong endothermic peak recorded at 1288 °C and excellent thermal stability recorded up to 1488 °C. 20% Titanium Boride added Alumina-Silicon Carbide nano-composite exhibited 6% reduced mass change and 20% increase in thermal stability at 1488 °C. The microstructure of the Al 2 O 3 -SiC-20 vol.% TiB 2 was studied using XRD and SEM equipped with an EDX analysis facility. The SEM image displayed the surface morphology of the composite and XRD, EDX analysis exhibited the presence of Titanium particles with an average size of 95 nm.

Silicon, Apr 17, 2021

Recent innovations in materials technology upsurge the use of Al2O3 and SiC based composites in a... more Recent innovations in materials technology upsurge the use of Al2O3 and SiC based composites in aerospace, automotive, defence, transportation, and sporting industries. The reinforcements like Al, Ni, Cr, Gr, TiB2, ZrB2, MgO, HfB2, CNTs, B4C, Y2O3, GFRP and metal alloys are improving the elevated temperature thermal stability, corrosion resistance, wear resistance, fracture toughness, tensile strength, solar absorbance, fracture strength, flexural strength and crack healing ability respectively. The manufacturing methods like hot isostatic pressing, hot pressing, spark plasma sintering, electro stir forging process the Al2O3-SiC based material with a temperature range of 1400 °C–2000 °C and a pressure range of 2–100 Mpa to make the material suitable for ultra-high temperature applications. Reinforcements, the shape of the reinforcements, processing methods, processing routes, heat treatment methods, and surface finishing techniques are the prime factors that influence the strength, ...

Advances in Materials Research,Springer, Singapore, Feb 5, 2021

In non-ferrous foundry, casting defects like microporosity and pin-hole porosity are due to expel... more In non-ferrous foundry, casting defects like microporosity and pin-hole porosity are due to expel of dissolved gases like hydrogen during solidification of castings from liquid stage to solid stage. These porosity defects significantly affect the strength and pressure tightness of the aluminum components. For a sound casting, the amount of dissolved gases present in the molten aluminum metal should be less. Degassing is a perfect process for removing dissolved gases from molten aluminum metal and its alloys. In this research, degassing of LM13, LM25, LM28, L99, and L155 was performed by passing nitrogen gas into rotary degassing chamber at different treatment time. The amount of H2 ml/100 g available in the aluminum alloys was measured after degassing by hydrogen gas analyzer and compared with the minimal value. Nitrogen degassing reduced the quantity of H2 ml/100 g less than the minimal value and made the aluminum alloys defect free.

$Research paper thumbnail of Experimental investigation on the mixed mode fracture behaviour of nano modified glass epoxy three phase laminated composite through Modified Arcan Fixture$

Engineering Research Express, Jul 26, 2021

This paper investigates carbon nano tube’s (CNTs) effect in the mixed-mode inter-laminar fracture... more This paper investigates carbon nano tube’s (CNTs) effect in the mixed-mode inter-laminar fracture response of glass fibre reinforced epoxy laminates. Laminates are prepared by adding 1%, 2% and 3% of CNTs with matrix by weight. Modified arcan fixture has been employed to generate the data for Mode I, Mode II, and various mixed-mode ratios. Loading angle has varied from 0° to 90° in steps of 15°, and the generated data was reduced by applying correcting factors to get toughness value. Periodic function model was employed to estimate the elastic constants for data reduction. Loading angle, Proportion of Carbon Nano Tube, Crack length ratio, Stress intensity factor and Energy release rate are taken as the variables for discussion. Fractured surfaces are also captured with scanning electron microscopy to study the influence of Carbon Nano Tube in inter-laminar fracture. Genuineness of specimen and fixture on exhibiting mixed mode fracture load at crack tip, was verified before proceeding the characterization. Fracture resistance was enhanced from 2.95% to 5.24% and critical load at fracture was increased from 17.47% to 22.79% with Carbon Nano Tube addition compared to the neat GFRP specimens. Enhancement is high for 1% addition, and enhancement rate decreases after further reserves. Failure assessment study was also conducted on specimens and elliptical failure criteria was noted as the best one for defining mixed mode fracture of CNT filled glass epoxy specimens.

MATERIALS, MECHANICS & MODELING (NCMMM-2020)

This paper deals with the conceptual design of fixed wing Vertical Take-Off and Landing (VTOL) Un... more This paper deals with the conceptual design of fixed wing Vertical Take-Off and Landing (VTOL) Unmanned Aerial Vehicle (UAV) of mini category. The UAV is designed as per the mission requirement including wing, fuselage, empennage and tilt-rotor mechanism. The UAV is then analysed for its aerodynamic, performance and stability analysis. Wing, fuselage, empennage and tilt-rotor mechanism is designed and modelled in OpenVSP and the whole UAV is analysed in VSPAero. The UAV designed has payload carrying capacity of 2kg – 4kg, range of 90 km (with 2 kg payload), stall speed of 11.8m/s (without payload), 13.8m/s (with 2 kg payload) and endurance of 1.52 hrs (with 2 kg payload). The UAV being a fixed wing -VTOL system has better reach to geographically challenging areas than the fixed wing counterparts (like UAV Factory Penguin C/B/BE UAVs) and also less power consumption, higher speed and high payload carrying capacity compared to rotary wing counterparts (like DJI drones).

Advances in Human and Machine Navigation Systems, May 29, 2019

This chapter unveils an enhancement strategy for nap-of-the-earth. The nap-of-the-earth (NOE) mod... more This chapter unveils an enhancement strategy for nap-of-the-earth. The nap-of-the-earth (NOE) mode is the most energizing, most unsafe, and is generally the slowest. Military aircraft to maintain a strategic distance from opponent detection and assault in a highthread circumstance use it. NOE used to limit discovery by the ground-based radar, targets and the control system. The radar altimeter (RA) or terrain following radar (TFR), terrain awareness and warning system (TAWS) used to identify the curbs during flying in NOE flights. Here, while the plane is at the nap of the earth activity, the speed and the height must be moderate as effectively decided. The terrain following radar (TFR) keeps up the altitude from the beginning. Therefore, we analyze the issue to expand the performance of the airplane by extending the terrain by a few modes of the TAWS, which given by various aviation authorities 1. Further to this, different TAWS modes of action, explanation of mode selection and progression in TAWS clarified in detail. This chapter displays the MATLAB programme for a few patterns of TAWS mission, and simulation of the flight path for the excessive terrain closure rate from mode two operation of the flight.

ARPN Journal of Engineering and Applied Sciences , Jan 10, 2016

This paper explains the Fabrication of an aerial robot quadcopter with an advanced avionics syste... more This paper explains the Fabrication of an aerial robot quadcopter with an advanced avionics system for the use of spraying pesticides and fertilizers in agricultural land. The construction of a Quadcopter with a multi-rotor setup will be the most promising task for unmanned aerial vehicle designers. The fabricated vertical takeoff and landing aerial robot quadcopter have four motors mounted on its four arms. A Brushless motor of 1000 to 1500 rpm and propeller of 10×4.5 have been inbuilt with this Quadcopter for obtaining range up to 700 meters. The Experimental flying test of advanced aerial robot quadcopter is carried out and it can lift up to 4kgs weight as a payload.

This paper provides the effects of boundary-layer bleeding on hypersonic inlets performance. The ... more This paper provides the effects of boundary-layer bleeding on hypersonic inlets performance. The inner flow field of a hypersonic inlet at different bleeding rate is simulated with a Reynolds-averaged Navier-Stokes solver using a renormalization group kturbulence model. In contrast with no bleeding, the performance parameter of hypersonic inlets without backpressure is reduced slightly, but the flow uniformity is improved. The interaction between boundary layers and shocks is weakened at the action of the bleeding, which leads to that the boundary-layers separations at the entrance of the isolator caused by the high-backpressure occur later, and it can improve the maximum backpressure ratio of hypersonic inlets. With the bleeding rate increasing, the maximum backpressure ratio of hypersonic inlets is added, while the total-pressure recovery coefficient and shock strength are reduced. This paper is a useful reference to the design and performance improvement of hypersonic inlets and propulsion systems.

In this research work, we have intended to study the machinability of dry turning of austenitic s... more In this research work, we have intended to study the machinability of dry turning of austenitic stainless steel AISI 316L and Super Duplex 2507 stainless steel with coated carbide PVD-TiAlN Nano-multilayer. The turning operations were performed at three different cutting speeds (79, 121 and 188 m/min), constant feed rate(0.159 mm/rev) and depth of cut (1 mm) respectively. The effect of cutting speed in cutting temperature, the cutting force, surface roughness, tool wear and chip breaking were analyzed. It reveals that the higher cutting force and poor surface finish were found in the Super Duplex 2507 stainless steel over austenitic stainless steel AISI 316L. It is observed that higher tool wear occur in case of Super Duplex 2507 stainless steel over an austenitic stainless steel AISI 316L. The collected chips of various cutting parameters have shown that friendlier-to-machine chips are obtained when machining austenitic stainless steels over the duplex stainless steel grades. Finally, Super Duplex 2507 stainless steel displays poorer machinability responses.

Your article is protected by copyright and all rights are held exclusively by Springer Nature B.V... more Your article is protected by copyright and all rights are held exclusively by Springer Nature B.V.. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".

In order to enhance the turbine efficiency and power, modern Gas turbine engine are required to o... more In order to enhance the turbine efficiency and power, modern Gas turbine engine are required to operate at higher Temperature. Because of this, the turbine components are experiencing the increasing heat loads. The blades from the gas turbines are getting damaged due to the creep, fatigue, thermal stress etc., and it is reduced by applying the external and internal coolant inside the blades. The external cooling process possesses less heat convection rate when compared to internal one. The internal open loop cooling has coolant wastages and corrosion on the surface. But in the internal closed loop cooling the coolant can be reusable and reduce fatigue fracture formation at the surface. The Internal Closed Loop Cooling depends on the shape and size of coolant passages and types of the coolant used. In this paper, newly designed coolant passage shapes such as four star tip (4ST), four star smooth (4SS), five star tip (5ST), five star smooth (5SS), hexagon tip (HT), hexagon smooth (HS) for the future gas turbine are proposed.

Micro Aerial Vehicle is the flying vehicle which reigns the modern era. They are controlled with ... more Micro Aerial Vehicle is the flying vehicle which reigns the modern era. They are controlled with both autopilots, and human controllers in ground stations. They can fly either under their own control or fly under the command of a human pilot during complicated phases of the mission. In this research paper we have made an attempt to fabricate a micro aerial vehicle with high stability and experiment it under different conditions. They are fabricated with composites (Glass fibres). The use of composites provides the model light weight and good strength. This micro vehicle is categorized with reference to the Reynolds number. In this case the madare controlled with the transmitters. The ultimate goal is to develop highly stable and sustainable UAV in air during flight without any flap deflection.

The necessity of Fighter Aircrafts to travel faster than the speed of sound has resulted in the d... more The necessity of Fighter Aircrafts to travel faster than the speed of sound has resulted in the development of more complex and sophisticated Structural designs for the modern day fighters. A flight control surface is supported from an aircraft frame structure, for pivotal movement about a hinge axis. The surface is deployed against an aerodynamic load which is a function of surface deflection and imposes a torque on the flight control surface wanting to rotate it back to a neutral trim position. A counterbalancing hydraulic actuator is connected between the frame structure and the flight control surface. This actuator is oriented to oppose a counterbalancing torque on the flight control surface acting in opposition to the torque imposed by the aerodynamic load. A controllable, separate actuator is interconnected between the frame structure and the flight control surface and is operated for positioning the flight control surface. In pure delta Aircraft, there are two Elevons installed in trailing edge of each wing i.e., Elevon I/B and Elevon O/B. The movement of Elevon assemblies are controlled by Elevon actuator, which is connected between Elevon and Wing Structure. The required movement of Elevon is controlled by Digital Flight Control Computer (DFCC).This project deals with the design modification of Connecting Horn and Connecting Rib linkage mechanism of inboard elevon of pure delta aircraft to counter balance the Aerodynamic and flutter loads during flight.

The present day records the greatest usage of unmanned aerial vehicles (UAVs) in civil and milita... more The present day records the greatest usage of unmanned aerial vehicles (UAVs) in civil and military fields. UAVs are experimenting materials with respect to physical and mechanical properties which should have more strength to weight ratio, resistance to buckling, high ultimate tensile strength, less inflammable, low thermal gradient, high resistance to noise, high resistance to vibration, resistant against deteriorative fuels and chemicals, low corrosion, low oxidation, and high fatigue. This paper presents an experimental investigation of mechanical properties of balsawood-glass fiber, depron-balsa wood, and depron-glass fiber-balsa wood composites. Tensile, hardness, flexural, and thermal tests of different samples are conducted as per ASTM standards. Depron-glass fiber-balsa wood showed 6 times greater tensile strength and 66% hardness than plain balsa wood. Depron-glass fiber-balsa wood showed 34% greater flexural strength than plain balsa wood.

This paper explains about the Fabrication of aerial robot quadcopter with advanced avionics syste... more This paper explains about the Fabrication of aerial robot quadcopter with advanced avionics system for the use of spraying pesticides and fertilizers in agricultural land. Construction of Quadcopter with multi rotor setup will be most promising task for the unmanned aerial vehicle designers. The fabricated vertical takeoff and landing aerial robot quadcopter has four motors mounted on its four arms. Brushless motor of 1000 to 1500 rpm and propeller of 10×4.5 have been inbuilt with this Quadcopter for obtaining range up to 700 meters. The Experimental flying test of advanced aerial robot quadcopter is carried out and it can lifts up to 4kgs weight as a payload.

In non-ferrous foundry, casting defects like micro porosity and pin-hole porosity is due to expel... more In non-ferrous foundry, casting defects like micro porosity and pin-hole porosity is due to expel of dissolved gases like hydrogen during solidification of castings from liquid stage to solid stage. These porosity defects significantly affect the strength and pressure tightness of the aluminum components. For a sound casting, the amount of dissolved gasses present in the molten aluminum metal should be less. Degassing is a perfect process for removing dissolved gases from molten aluminum metal and its alloys. In this research, degassing of LM13, LM25, LM28, L99, and L155 was performed by passing nitrogen gas into rotary degassing chamber at different treatment time. The amount of H2 ml/100g available in the aluminum alloys were measured after degassing by hydrogen gas analyzer and compared with the minimal value. Nitrogen degassing reduced the quantity of H2 ml/100g less than the minimal value and made the aluminum alloys defect free.

The design parameters of turbine blade coolant passage need to be improved to achieve the high pe... more The design parameters of turbine blade coolant passage need to be improved to achieve the high performance. The shape optimization is done for four various types of turbine blade coolant passage i.e. 4SS, 4ST, 5SS, 5ST. The diameter of the coolant passage is constant and modified in the shapes as smooth and tip in terms of fin like structure (triangle). The contact surface area of the coolant to the turbine blade is increased in 5ST compared to 4ST. The modelling and analysis for the turbine blade coolant passage is done for various gas inlet temperatures. The steam mass flow rate and coolant factor for closed loop cooling are analyzed. The 4ST shows the coolant factor of 0.015 and for 5ST is 0.0168 are achieved at 1500°C.