Teaching and Research

Teaching Experience

NIT Tiruchirappalli

1. Finite Element Method

2. Metrology

3. Vehicle Dynamics

4. Operations Research

IIT Delhi

1. Solid Mechanics Laboratory

2. Finite Element Method Laboratory

Thesis and Projects

Ph.D. Thesis

Title: Modelling of Nanostructures Using Second-Order Strain Gradient Nonlocal Theory.

Supervisor: Prof. B. P. Patel, Professor, Department of Applied Mechanics, Indian Institute of Technology Delhi.

Abstract: To capture the size effects which are predominant at the Micro- /Nano-scales, analytical techniques and Finite Element Method (FEM) are employed. Static bending, buckling and vibration analyses of linear and geometrically nonlinear elastic isotropic nanobeams/nanoplates are carried out using second-order positive/negative strain gradient nonlocal theories. New elements are developed to take care of the additional non-classical boundary conditions obtained due to the nonlocal effect. Navier and Levy’s solution techniques are used to derive the analytical solutions, whereas numerical codes are developed using MATLAB and Fortran to implement the finite element models for beams and plates, respectively. Present results are found to be in excellent agreement with those from experiments and Molecular Mechanics simulations.

M.Tech. Thesis

Title: Nonlinear Analysis of Nanobeams Using Nonlocal Theories.

Supervisor: Prof. B. P. Patel, Professor, Department of Applied Mechanics, Indian Institute of Technology Delhi.

Abstract: Two nonlocal continuum theories, viz., Eringen’s stress gradient theory and Mechanically based integral theory were considered to model Euler-Bernoulli beam with geometric nonlinearity. Numerical codes were developed in MATLAB employing Finite Element Method (FEM) to solve the equation of motion for numerous boundary conditions. Newton-Raphson iteration technique was used to solve the nonlinear equations and transient response was obtained by employing Newmark's constant-average acceleration technique. Dependence on the boundary conditions was observed for linear analyses using Eringen’s model, whereas the Mechanically based model was apparently free from it. This boundary dependence behaviour did not hold good for nonlinear analyses at higher loads.

B.Tech. Project

Title: Methoding and Testing of Grey Cast Iron Pipe.

Supervisor: Prof. P. K. Mohapatra, Professor, Department of Mechanical Engineering, Institute of Technical Education and Research, Siksha ‘O’ Anusandhan University, Bhubaneswar.

Abstract: A gray cast iron pipe joint with non-uniform cross-section was drafted. Wooden pattern and core box were designed including suitable allowances. The calculations for gating system and riser was carried out. Green sand moulding and core making technique was employed for the casting process. The sample was then examined for various defects like blow holes, gas porosity, shrinkage defects, pouring metal defects, and metallurgical defects. Tensile test and Vickers harness test were also performed for the tensile strength and hardness number, respectively. Microstructure analysis ascertained that the graphite flakes were of Type C and were distributed uniformly with random orientation.

Industrial Project

Title: Study of Turbo Jet Engine and Module and Assembly of AL-31FP Engine Used in SU-30MKI.

Industry: Engine Division, Hindustan Aeronautics Limited (HAL), Koraput, India. May 29- June 27, 2009.

Abstract: The working principle of gas turbine engine was studied. Various parts of the AL-31FP turbojet engine such as compressor, combustion chamber, turbine, afterburner and nozzle were identified and their individual functions as well as the operation of the whole engine as a unit were learnt in the assembly shop. The intricate parts such as fuel lines, lubrication system, control valves, air-to-air heat exchanger, gearboxes, turbocharger and balancing of the rotating parts were also studied. Five different phases involved in the manufacturing of AL-31FP engine in India with the gradual translation of the Russian technologies were learnt as well.