pushkaraj bhagwat profile presentation
TRANSCRIPT
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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
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ANSYS Inc. – Testing Engineer Intern
0
2000
4000
6000
8000
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
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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.
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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
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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
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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
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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