Machine Learning Summer Internship

Kamalendu Ghosh

**** * ****** ***** **, Unit ** C, Meridian, ID 83642

H 915-***-**** • B *********.******@*****.***

Í https://www.linkedin.com/in/kg5/

Summary

• 7+ years of extensive experience in implementation of non-linear FEM codes for incompressible dielectric/magnetorheological elastomers for using Abaqus Subroutines: UEL/UMAT and FEniCS

• Strong fundamentals of continuum mechanics, constitutive modeling, mechanics of composites, coupled-physics and partial differential equations

• Experience in determining macroscopic properties of composites based on microstructural inputs

• Experience in: a) developing multiphysics Finite Element codes from first principles, b) Finite Element models using commercial software & c) Physics Informed Machine Learning

• 3 years of professional experience at KLA, Thornton Tomasetti and Summer Internship at ASML

• Keywords: Nonlinear FEA, Nonlinear solid mechanics, Constitutive material modeling (Hyperelasticity, Viscoelasticity), Multi-physics (Electro-/Magneto-/Thermo-Mechanics) & Multi-scale modeling, Abaqus User Subroutines Education

University of Illinois Urbana-Champaign Aug 2016 – Nov 2022 Ph.D. in Applied and Computational Mechanics GPA: 4.0/4.0 Thesis: The Mechanics of Elastomers Filled with Electro-Active Solid and Fluid Inclusions Indian Institute of Technology Kharagpur May 2013 – Aug 2014 M.Tech. in Structural Engineering GPA: 8.97/10.0

Thesis: Numerical Analysis of Tuned Liquid Dampers (Best Thesis Award) Indian Institute of Technology Kharagpur Aug 2009 – May 2013 B.Tech. (Hons.) in Civil Engineering GPA: 8.97/10.0 Institute Silver Medal (Best Outgoing Student)

Technical Skills

• Programming: Abaqus UEL, Abaqus UMAT, Fortran, Mathematica, MATLAB, Python, Python scripting

• FE Packages/Libraries: Abaqus, ANSYS (MAPDL, PyMAPDL, PyAnsys), FEniCS

• CAE Tools: Catia, Solidworks

• Machine Learning: Physics-informed Neural Networks (PINNs), PyTorch

• Theory: Nonlinear Mechanics, Coupled-physics, Constitutive Modeling, Theory of Composites, Computational Mechanics Professional Experience

Micron Technology Sep 2024 – Present

Position: Equipment Development Engineer, Wafer-Wafer Bonding Boise, ID

• Skills: Wafer-Wafer Bonding, DOEs, Computational Mechanics, Mathematical Modeling, FSI, COMSOL

• Research and Develop strategies to improve Equipment maturity for First of a Kind (FOAK) bonding hardware

• Creating project roadmaps, Setting of milestones and checkpoints, using Physics Modeling to motivate hardware innovations

• Conduct root cause analysis to understand the limitations of current hardware to drive development projects

• Design and conduct DOEs for equipment repeatibility, stability and for generating data for simulations and data analysis

• Develop Data Modeling strategies for predicting bonding overlay for Automation/Feed-Forward overlay corrections

• Develop strategies for PCA Analysis for Bonder Fingerprinting

• Develop physics-based mathematical models and multiphysics simulations of wafer-bonding process

• Perform literature surveys, participate in industry research conferences, publish papers and submit disclosures KLA Nov 2022 – Aug 2024

Position: Research Scientist, Advanced Development Milpitas, CA

• Skills: Computational Mechanics, PINNs, Mathematical Modeling, Thermo-mechanics, FSI

• Creating project roadmaps, Setting of milestones and checkpoints, Engagements with Bonding vendors & Process Engineers for Wafer Bonding Integration

• Developed Finite Element models for multiphysics simulations of wafer-bonding process and predicting overlay errors in FEniCS

• Developed Physics Informed Neural Networks (PINNs) model for predicting overlay errors in Wafer-Wafer Hybrid Bonding

• Developed Physics Informed Machine Learning algorithm for Constitutive Model Discovery of Bonding Energy

• Mechanical and thermal Finite Element Simulations for IC Packaging: Die cracking, Junction Temperature Characteriza- tion, Failures due to CTE mismatch, Drop Tests

ASML May 2022 – Aug 2022

Position: FEA Engineering MDEV Intern San Diego, CA

• Skills: Abaqus User Subroutine, Thermo-mechanics, Python Scripting, Design of Experiments (DOE), Constitutive Modeling

• Developed a thermo-viscoelastic constitutive model for modeling melting of glass

• Implemented thermo-viscoelastic constitutive model along with surface tension for modeling glass-capillary closing in Abaqus User Elements

• Prepared pre- and post-processing python scripts for performing DOE and parametric studies Research Experience

University of Illinois Urbana-Champaign May 2017 – Nov 2022 PhD Candidate Urbana, IL

• Skills: Nonlinear Mechanics, Interfacial Mechanics (Surface Tension & Elasticity), Constitutive Modeling, Multi-physics

& Multi-scale, Elastomers, Composites, Abaqus Subroutines, Nonlinear Finite Element Analysis (FEA)

• Thesis Research: The Mechanics of Elastomers Filled with Electro- and Magneto-Active Fluid Inclusions

- Proposed constitutive model of electro-/magneto-active elastomers accounting for dissipation in both mechanical and dielectric/magnetic response

- Conceptualized constitutive model of the elastomer-fluid interface

- Formulated a robust and stable numerical scheme: (a) conforming Crouziex-Raviart mixed Finite Element formulation for spatial discretization coupled with (b) higher-order explicit Runge-Kutta discretization in time

- Implemented the numerical scheme for the multi-physics problem with interface elasticity in Abaqus User Elements

- Led experimental collaborations across different research groups in two different universities

- Demonstrated extreme and non-intuitive macroscopic properties on account of interfacial physics University of Illinois Urbana-Champaign Apr 2017 – Oct 2021 Research Assistant Urbana, IL

• Skills: Nonlinear Mechanics, Constitutive Modeling (Hyperelasticity, Viscoelasticity), Multi-physics & Multi-scale, Elastomers, Composites, Abaqus Subroutines, Nonlinear Finite Element Analysis (FEA)

• The nonlinear viscoelastic response of suspensions of rigid and porous inclusions in rubber

- Performed a first homogenization result for nonlinear finite viscoelasticity of soft composites

- Constructed microstructures adopting Random Sequential Adsorption (RSA) algorithm in Python and Mathematica

- Formulated a robust solver: a Newton-like solver staggered with fifth-order explicit Runge-Kutta time integration

- Implemented the framework in Abaqus User Elements and FEniCS

• The two-potential constitutive modeling of dielectric elastomers

- Introduced a constitutive framework for dielectric elastomers for coupled dissipative electro-mechanical response

- Introduced the concept of apparent permittivity for spectroscopy measurements on a stretched elastomer

- Implemented the constitutive framework in MATLAB and validated the model to experiments performed on VHB 4910

• Homogenization of time-dependent dielectric composites containing space charges

- Introduced constitutive models for interphasial space charges

- Developed the physics explaining extreme enhancement and diminishment of dielectric response of composites

- Proposed strategy to design composites with exceptional macroscopic properties

- Finite Element implementation of the emerging coupled complex-variable PDEs in Abaqus User Elements Indian Institute of Technology Kharagpur May 2012 – May 2014 Research Assistant Kharagpur, India

• Skills: Structural Dynamics, Fluid-Structure Interaction, Seismic Loading, Frequency Domain Analysis, Coupled Eulerian- Lagrangian, Abaqus

• Master’s Thesis: Numerical Analysis of Tuned Liquid Dampers (TLDs) [Thesis Report]

- Performed numerical modeling using Abaqus Coupled Eulerian-Lagrangian formulation

- Developed energy based indices to measure the damped response

- Investigated the effect of mass ratio on the performance of a TLD

- Performed a frequency domain analysis of the TLD-structure system to explain the improved damped response

- Improved the effectiveness of TLDs over a broader range of excitation frequencies by installation of baffles Fellowships and Awards

• Conference Travel Award, UIUC, 2022

• Recognized in the List of Teachers Ranked Excellent by their students in Fall 2020 [Link]

• Mavis Future Faculty Fellowship, UIUC, 2020-2021

• Ravindra Kinra and Kavita Kinra Fellowship, UIUC, 2016-2017

• Institute Silver Medal (best outgoing student in the Department of Civil Engineering), IIT Kharagpur, 2014

• Proficiency Award (best thesis work), IIT Kharagpur, 2014 Publications

• 8+ papers in High Impact factor journals (e.g. JMPS, Soft Matter)[Google Scholar] Conference Organization & Presentations

• Session Chair: ASME InterPack 2024

• Presentations in Industry Conferences: ECTC (IEEE) 2024, NAFEMS 2024

• Presentation in Academic Conferences: European Solid Mech. Conf. 2022, USNCTAM 2022, SES 2020, SES 2019, Int. Forum on Earthquake Eng. 2017

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