Constitutive modelling of material behaviour based on continuum mechanics

Starting date

7. Oktober 2019

Duration of contract

6 Monate


bis Entgeltgruppe 5 TVöD

Type of employment


"Cutting-edge research requires excellent minds – particularly more females – at all levels. Launch your mission with us and send in your application now!" Prof. Pascale Ehrenfreund - Chair of the DLR Executive Board

Lifetime prediction of ceramic matrix composites with consideration of plasticity in the material

In the department of ceramic composite structures at DLR (German Aerospace Center), Institute of Stuctures and Design, ceramic matrix composites (CMC) have been developed since the late 1980s. These materials exhibit damage tolerant fracture behavior, good thermal shock resistance and insensitivity towards cyclic fatigue. So called C/C-SiC materials are manufactured via liquid silicon infiltration (LSI), a robust process based on three characteristic steps: (1) Manufacture of a CFRP preform; (2) Pyrolysis, resulting in a porous C/C preform; (3) Siliconization by capillary infiltration of Si in the C/C preform and chemical reaction of Si with C, building up a SiC matrix. The resulting microstructure is complex and highly anisotropic in nature. In recent years, effort has been made to capture the material behaviour accurately with the help of constitutive equations based on continuum mechanics. The main task of this internship will be to extend the existing models in the department to include plastic strains.

The work will comprise:

  • Understanding the existing material models
  • Literature review for available plasticity models in brittle materials
  • Development of constitutive equations based on continuum mechanics
  • Validation of models with the help of experimental results
  • Integration of model in existing tool architecture to predict lifetime of CMCs

Your qualifications:

  • Student of Computational, Material or Aerospace Engineering
  • Knowledge of mechanics of composite materials
  • Knowledge of FEM Simulation
  • Experience with FORTRAN and ANSYS Workbench
  • Basic knowledge of Python

Your benefits:

Look forward to a fulfilling job with an employer who appreciates your commitment and supports your personal and professional development. Our unique infrastructure offers you a working environment in which you have unparalled scope to develop your creative ideas and accomplish your professional objectives. Our human resources policy places great value on a healthy family and work-life-balance as well as equal opportunities for persons of all genders (m/f/non-binary). Individuals with disabilities will be given preferential consideration in the event their qualifications are equivalent to those of other candidates.

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Technical contact

Neraj Jain
Institute of Structures and Design

Phone: +49 711 6862-8264

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Vacancy 42967

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DLR site Stuttgart

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DLR Institute of Structures and Design

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