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Srikanth
Uppiretla

◆Engineering PortfolioCAD/CAE · Mechanical Design · FEM · Technical Documentation

Target roles: Structural Analysis | CAE | Mechanical Design

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Available immediately · Job seeker visa · Open Germany-wide
Srikanth Uppiretla

I work across CAD/CAE, mechanical design and structural analysis - from CAD surfaces, prototype mechanisms and technical documentation to FEM-driven design validation. M.Sc. Space Engineering at the University of Bremen, thesis at Rocket Factory Augsburg, hands-on composite work with ASTRA e.V.

Work

FEA- Structural Simulation · FEMAP / NX Nastran

CFRPBucklingOptimization

CFRP Interstage - Structural Optimization

Python-based parametric optimization of a stiffened CFRP interstage under axial compression. Classical Laminate Theory, NASA SP-8007 knock-down factors and Bruhn local panel checks, validated with linear and nonlinear FEM in FEMAP / NX Nastran. The optimization converged on a lightweight stiffened configuration with close correlation between analytical and FEM-predicted buckling capacity.

Master’s Thesis - Rocket Factory Augsburg | 2024-2025

View case study

Master’s thesis work focused on the structural analysis and optimization of a stiffened composite cylindrical shell for an orbital launch-vehicle interface.

Context
Engineering problem

Explore lightweight stiffener configurations while maintaining credible resistance to global and local buckling under axial compression.

Constraints

Composite layups, shell stability, practical stiffener arrangements, traceable assumptions and confidentiality limits around launch-vehicle details.

My contribution

Built the parametric workflow, evaluated design variables, prepared and validated FEM models, compared analytical checks and documented decisions.

Engineering approach
Methodology

Python-based optimization, Classical Laminate Theory, NASA SP-8007 knock-down factors, Bruhn local panel checks, FEMAP and NX Nastran linear/nonlinear FEM.

Tools
  • Python
  • FEMAP
  • NX Nastran
  • MATLAB
Outcome
Verified result

The public work demonstrates convergence toward a lightweight stiffened configuration and close correlation between analytical and FEM-predicted buckling behaviour.

Engineering lesson

Boundary conditions, geometric imperfections and local stiffener behaviour must be treated consistently when analytical sizing and nonlinear FEM are compared.

Only material already approved for public presentation is shown. Proprietary geometry, loads and detailed technical values are excluded.

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Assembly FEMInterfacesNonlinear

Full Stage-Interface Assembly - Nonlinear FEM

Extension of the isolated shell analysis to the full launch-vehicle interface: CFRP interstage, aluminum separation flanges, steel integration skirt and the stage-1 tank dome, tied together with RBE2 connections. Nonlinear collapse analysis under combined axial compression and internal tank pressure showed how realistic boundary conditions change the buckling behavior versus the isolated shell.

Master’s Thesis - Rocket Factory Augsburg | 2024-2025

View case study

Extension of isolated-shell work to a wider launch-vehicle stage-interface assembly using public-safe geometry views.

Context
Engineering problem

Understand how connected metallic interfaces, tank structures and combined loading alter the response predicted by an isolated shell model.

Constraints

Mixed materials, connected interfaces, nonlinear response, realistic boundary representation and strict confidentiality.

My contribution

Prepared assembly connections, reviewed load paths, ran nonlinear collapse studies and compared system-level behaviour with isolated-shell results.

Engineering approach
Methodology

FEMAP, NX Nastran, shell idealisation, RBE2 connections and nonlinear static analysis.

Tools
  • FEMAP
  • NX Nastran
Outcome
Verified result

The study showed that assembly-level boundary conditions materially change the observed buckling response.

Engineering lesson

Model scope and interface stiffness can be as influential as material properties when instability is the governing mode.

Only previously public, non-sensitive images and high-level methods are included.

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SOL 106ImperfectionsPost-buckling

Nonlinear Buckling with Geometric Imperfections

Post-buckling behavior of both stiffener concepts analyzed with nonlinear static solutions (SOL 106), seeding initial geometric imperfections derived from the first eigenmode. The deformation follows classical shell-instability patterns; comparing imperfection-sensitive FEM capacity against knock-down-factor predictions validated the analytical design approach.

Master’s Thesis - Rocket Factory Augsburg | 2024-2025

View case study

Imperfection-sensitive nonlinear analysis of alternative stiffener concepts for composite cylindrical shells.

Context
Engineering problem

Estimate a more realistic shell-instability response than an ideal linear eigenvalue analysis can provide.

Constraints

Sensitivity to imperfection amplitude, mesh strategy, convergence and interpretation of post-buckling response.

My contribution

Prepared meshes, seeded modal imperfections, ran nonlinear studies and compared the results with analytical knock-down approaches.

Engineering approach
Methodology

NX Nastran SOL 106, eigenmode-derived imperfections and comparison against analytical shell-stability checks.

Tools
  • FEMAP
  • NX Nastran
Outcome
Verified result

The public results show classical shell-instability patterns and support the analytical design approach at a high level.

Engineering lesson

Imperfection assumptions must be explicitly documented because they strongly influence nonlinear shell capacity.

Detailed loads, dimensions and proprietary design values remain excluded.

Select an image to view it full screen.

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Experience

Apr 2024 - Jun 2025
15 months

Master’s Thesis - Structural Optimization

Rocket Factory Augsburg AG | Augsburg, Germany

FocusStructural analysis and parametric optimization of stiffened CFRP cylindrical shells.

  • Developed a Python-based optimization framework for stiffened CFRP cylindrical shells under axial compression.
  • Evaluated design variables such as skin thickness, stringer spacing, ring spacing and stiffener arrangement for lightweight structures.
  • Validated finite element models in FEMAP and NX Nastran using composite layups, shell elements and realistic load assumptions.
Jan 2024 - Mar 2024
3 months

Structural Analysis Intern / Working Student

Rocket Factory Augsburg AG | Augsburg, Germany

FocusFEM, CAD-surface preparation and mechanical hardware assessment.

  • Analyzed a LOX tunnel under axial and radial pressure using FEM and structured load assessment.
  • Identified stress hotspots and evaluated dome inversion risks for technical reviews in a development environment.
  • Created CAD surfaces for FTS simulations and supported simulation-oriented integration planning.
Aug 2022 - Dec 2023
17 months

Composite Structural Engineer

ASTRA e.V. Rocketry Group | Bremen, Germany

FocusComposite design, manufacturing support, quality review and pressure-load FEM.

  • Designed and fabricated a filament-wound CFRP outer shell for a student sounding rocket.
  • Defined winding angles, mandrel geometry and ply layup for a manufacturable composite structure.
  • Supported fabrication, curing and quality control to review part quality during the project.

Education

University of Bremen

M.Sc. Space Engineering

Bremen, Germany | 2020 - 2025

Master’s thesis: Structural Analysis and Optimization of a CFRP Interstage of an Orbital Launch Vehicle.

Key modules
Space Systems EngineeringStructural Design & AnalysisThermal Control of SatellitesDesign of Space VehiclesMission Analysis & DesignTrajectory OptimizationSpacecraft Navigation & ControlSpace Propulsion SystemsOrbital SystemsProduct Assurance & Space TechnologyFatigue & Loads
Lovely Professional University

B.Sc. Mechanical Engineering

Jalandhar, India | 2013 - 2017

Bachelor project: Design and Fabrication of a Four-Wheel Steering System.

Key courses
ThermodynamicsHeat TransferFluid MechanicsSolid MechanicsDesign of Machine ElementsMachine Tools & MachiningComputer Aided Design & AnalysisStructural & CFD AnalysisIC EnginesVehicle DynamicsControl EngineeringManufacturing Processes
English
C1
German
B1
Hindi
Fluent
Telugu
Native

Certificates

Certificate
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Skills

CAD and Manufacturing

  • CATIA V5 · V6
  • Siemens NX · Inventor
  • Drafting · GD&T
  • CFRP · Manufacturing

FEM and Simulation

  • Simcenter Nastran
  • FEMAP
  • ANSYS
  • Strength · Buckling

Programming, Docs and Standards

  • Python · MATLAB
  • Technical Documentation
  • LaTeX
  • ECSS · NASA-STD · ISO

Contact

Let's build something that works.

Email
srikanth.uppiretla@gmail.com
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