Mechanical and thermomechanical dimensioning

Our expertise

G-MET Technologies proposes to perform mechanical and thermomechanical dimensioning calculations. Sizing is based on a conservative approach. The safety factors and the resistance criteria are dependent on the normative codes used (RCC-M, CODAP, EUROCODES …). Complex designs use finite elements method to determine stresses and strains induced by mechanical/fluid or thermal loading. Assemblies are generally dimensioned analytically using worksheets. In order to optimize computation time the coupling of beam/shell, shell/solid or sometimes beam/solid can be used.

Concerning thermomechanical calculations, two methodologies can be used:

  • Strong coupling

The method of resolution can take into account the coupling between thermal and mechanics by the simultaneous analysis of temperature and strain. This is called a strong coupling which is relatively heavy in computation.

  • Weak coupling

In the case where thermal and mechanical problems are uncoupled (material properties not very dependent on temperature or heat contribution due to mechanical strains negligible), it is advisable to adopt a weak coupling resolution consisting in the initial determination of temperature field and then evaluation of stresses/strains generated by this temperature field.

Example of studies involving mechanical and thermomechanical dimensioning

Mechanical dimensioning of a handling gantry used for underwater robots

  • Coupled shell/solid modeling
  • Geometrical nonlinearity (large displacements)
  • Sizing according to specific customer standards. Design modifications and optimization.
  • Calculations made using ANSYS

Mechanical dimensioning of an articulated connection (metal structure)

  • Combined shell/solid modeling
  • Non-linearity (contact management)
  • Dimensioning according to customer-specific standards
  • Calculations made using ANSYS

Mechanical dimensioning of a gas-gas heat exchanger

  • Combined shell/solid modeling
  • Thermomechanical calculation (weak coupling, temperature field recovery as input data)
  • Dimensioning according to customer specific standards
  • Calculations made using ANSYS