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Aluminum surface made up of many
microscopic asperities
Simplified single
half-asperity
Thesis –A computational study of the effects of material hardening and damage in micro-asperity friction
2D axisymmetric asperity compressed
until failure
3D asperity compressed and sheared
until flake formationEffect of strain hardening on friction Effect of rate hardening on friction
ANSYS Inc. – Testing Engineer Intern
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2000
4000
6000
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17.0 (9.1.3.1) 16.0 (9.1.2.1) 15.0 (9.1.2.1)
ρ=1000
ρ=1e-4 ρ=100
ρ=10
ρ=1e-2
ρ=1
ρ=1e-1ρ=1e-3
• Ran benchmark-tests
across different
hardware and software
platforms.
• Compared computation
time needed by latest 3
ANSYS versions.
• Assigned different
densities at each node of
a single element.
• Tested for correct
element mass matrices
and moments of inertia.
• Modelled a static crack
within a body with an
unstructured mesh.
• Calculated J-integrals
using UMM
(Unstructured Mesh
Mapping).
• Checked convergence
and accuracy of J-
integrals to ensure
effectiveness of UMM
tool.
• Simulated 3D fluid body
with heat flow due to
unequal temperatures.
• Tested user subroutine
of fluid elements for
correct state variable
calculations.
Project 1 Project 2 Project 3 Project 4
Procter & Gamble - UC Simulation Center(Confidential projects, hence no images)
Vibration reduction
(Hertzian theory, Abaqus, Matlab)
• Non-uniform contacting roller circumference was
causing vibrations.
• Drew analogy between rollers and simple springs.
• Calculated nonlinear spring stiffness using Hertzian
contact for round bodies.
• Equalized equivalent stiffness throughout the rolling
cycle using principles of ‘springs in series and parallel’.
• Reduced vibrations by nearly 90%.
Bond tearing
(Abaqus)
• Simulated and experimentally validated tearing of diaper
fabric bonds.
• Determined all possible failure modes.
• Suggested guidelines for improved bond pattern shape,
size and positions.
Glue flow simulation
(Abaqus - Smoothed Particle Hydrodynamics and
Fluid Structure Interaction)
• Glue is costly and overflows in all directions during
diaper production, making the assembly line messy.
• Simulated glue flow between diaper fabrics when they
are squeezed between rollers.
• Suggested solutions for constraining glue between diaper
layers (less glue lines, diaper edge fold-over).
Compression bonding process optimization
(Abaqus, SolidWorks)
• Simulated & calculated energy and force required for
creating each diaper-ear bond.
• Varied nub height and shapes to optimize energy and
force consumption.
• Varied bond patterns to find best possible solution.
SpaceX Hyperloop competition – Structural Team Lead of Hyperloop UC
Featured on Time.com
Amongst top 22 out of
more than 1200 teams
world over, selected to
test their pods at the
SpaceX test-track
My contribution –
Designed, optimized and
modeled
• Pod structure
• Braking characteristics
• Levitation assemblies
• Fail-safes
Graduate Research Assistant – Optimization of Mandibular fracture plates
Fracture close to
center of mandible
Fracture along
side of mandible
Hexahedral
mesh
Anatomy of mandible
CT Scans
3D Slicer
Meshlab
SolidWorks
Hypermesh
Abaqus
Toughening by weakening
2D FEM code development (▯and Δ)
High Performance ComputingGraduate Projects
Simulated idea for increasing
toughness of brittle materials by
artificially introducing weak areas.
Developed a finite element code in
MATLAB for the plane stress and
plane strain cases.
Worked with force controlled loads.
Developed C code to solve the Laplace
eqn. across multiple processes using the
Additive Schwarz method and MPI.
von M
ises
Str
ess
dis
trib
uti
on u
nder
dia
gonal
shea
r lo
ad
Undef
orm
edan
d d
eform
ed m
eshes
due
to t
ensi
on
Over
lappin
g
sub-d
om
ains
(Addit
ive
Sch
war
z)
Solv
ed L
apla
ce e
quat
ion
FSAE Supra 2011, 2012Robocon 2010
Design and Modelling of an Air Compressor
Senior year project
Truck Tippler
Undergrad
Projects
Designed, modelled, manufactured and raced 2 FSAE race cars
Designed a truck tippler for rapid unloading of trucks.
Also manufactured a working prototype (scale 1:100)
Built manual as well as autonomous robots that could build
multiple styrofoam pyramids within 3 minutes
Designed and modelled a reciprocating air compressor and all
its components according to customer specifications
