I have finished my undergraduation in Mechanical Engineering at Indian Institute of Technology Madras. I am going to pursue my graduate studies in Applied Mechanics at Caltech. Though it is still not fairly certain as to what I want to do in life, my interests are in Research and Academics.
As a part of my under graduate studies at IIT Madras, I spend some time in research projects in Mechanical Engineering. A Brief summary of the projects and links to the the published papers follow.
This work deals with modeling of three-dimensional topography produced on abrasive water jet cut surface. It makes use of the trajectory of jet predicted from the theory of ballistics and Bitter’s theory of erosion for numerical simulation of cutting front. The two dimensional topography at different depths of the cut surface is generated by considering the trajectories on the cutting front and the abrasive particles impacting the walls of cut surface randomly. For realistic generation of topography on cut surface, several instantaneous profiles generated in each region of cut are superimposed to obtain an effective profile. The nature of effective profiles thus predicted is analyzed and validated using power spectral density analysis. The effective profiles predicted at different depths are in turn used to generate the 3-D topography of AWJ cut surface. Results obtained by the proposed model are validated with experimental results.
The present work deals with an analytical approach that can suggest feed rate variations over the contour of complex surfaces while finish machining with ball nose end mill. In selecting the feed rate, this approach considers the material removal rate and tool life, apart from the consistent dimensional accuracy over the contour. A multi-objective optimization was done with an aggregating function with appropriately chosen weights. The effectiveness of the proposed approach is demonstrated by comparing its results with those obtained with the approach proposed by other researchers. Finally, the suitability of the proposed approach for efficient machining of complex surfaces is highlighted.
In the present work an analytical model is proposed to predict the bed behavior and hydrodynamics in the swirling regime using a lumped formulation where, the whole mass is assumed to be rotating with constant angular velocity. The model is based on principles of angular momentum conservation and moment equilibrium. This formulation gives results that agree very well with experimental results in terms of bed pressure drop and angular velocity of rotation of the bed. Also a parametric study of the influence of different parameters such as superficial velocity, blade angle, distributor and wall friction coefficients and cone angle on the properties of the swirling bed was conducted in order to determine the relative importance of the input parameters. Interestingly, it was found that the results were relatively insensitive to the values of friction coefficients chosen at the distributor and the wall. It is seen that changes in the blade angle do not affect the swirling greatly, in comparison to changes in superficial velocity.
This model is an improvement over a previous model which lumps the angular velocity of the particles throughout the bed. The basic assumption of the present model is that the bed can be viewed as a 2-dimensional system with rings at different radii and heights, each ring swirling with a specific angular velocity which is a function of the position of the ring. The model can predict the radial and axial variation of angular velocity of particles and the pressure drop across the bed height as a function of superficial velocity of gas, angle of injection, the properties of particles and those of gas.
This work attempts to find a closed form expression for the estimation of residual stresses in water jet peening. The dynamic material response to jet impact, assuming elastic behavior, is determined using the Navier’s equations. Owing to the symmetry of the problem, the equations are transformed to Hankel space using zero and first order Hankel transforms and solved. Due to the inability to find a closed form expression for the inverse Hankel transform of the solution, suitable engineering approximations are made. The results thus obtained are used to determine the strain field, which in turn is used to determine the zone of plastic deformation. Using von misses criteria for yielding and assuming kinematic hardening of the material, the residual stresses are evaluated upon unloading. The predicted results are compared with the experimental results.
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