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Junaid A.

FEA/Abaqus Engineer — Custom UMAT, Nonlinear Analysis & Material Characterization

Chandigarh, India

Global rank:

19,197 / 143,412

Skill pts: 5

Finite Element Analysis (FEA) Fortran Nonlinear FEA Python Script UMAT/VUMAT

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About

Final-year Mechanical Engineering (B.Tech) student with a focus that goes past standard coursework FEA — I write and debug custom Abaqus material subroutines (UMAT) in Fortran, not just run built-in models.

Recent work: reviewed and debugged a coupled thermomechanical shape-memory-alloy (SMA) constitutive UMAT — catching an incorrect transformation-strain direction tensor (causing ~18% underprediction), a memory-safety issue when NTENS ≠ 6, a missing corotational rotation of tensor state variables, and a secant-vs-consistent-tangent stiffness problem. I also build Python tooling for inverse material-parameter identification (Gauss-Newton / Levenberg-Marquardt refinement against nanoindentation and tensile-test data), and I'm developing my own browser-based FEA/material-characterization platform on the side — this is an active interest, not a one-off skill.

What I take on: nonlinear implicit/static analysis, custom material model (UMAT/USDFLD) development, Abaqus Python scripting for parametric or repetitive workflows, and material-parameter identification from experimental test data. Happy to start with a smaller, well-scoped task first so you can evaluate the work before a bigger commitment.

Experience

Research Project: Inverse Material Characterization IIT Ropar · Internship Aug 2025 – Present 1 yrs PB, India Built inverse-identification pipelines (Gauss-Newton and Levenberg-Marquardt refinement) to extract constitutive material parameters from nanoindentation and tensile-test data
Research scope also included dual-SMA metamaterial behavior and generative design methods

Education

PANJAB UNIVERSITY B.E, MECHANICAL ENGINEERING, null 2023 – 2027 (expected) Activities and Societies: null

Other experience

Independent technical work Reviewed and debugged a coupled thermomechanical SMA constitutive UMAT — identified an incorrect transformation-strain direction tensor, a memory-safety bug, and a tangent-stiffness formulation issue
Modulon Modulon — solo-built, browser-based engineering simulation platform

SimAtlas module (Abaqus-focused): includes MICA, a tensile-test material inverse-solver validated to under 1% error against synthetic Ramberg-Osgood data
Built a Python tool for automated, marker-based editing of Abaqus .inp files to support iterative inverse-identification workflows