Europlexus (EPX) is a simulation software dedicated to the analysis of fast transient phenomena involving structures and fluids in interaction. The program is co-owned by the Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA) and the Joint Research Centre of the European Commission (EC/JRC). Its development is carried out through a Consortium involving the co-owners and so-called major partners who are granted a complete access to the source code and development tools (see [2]).

Time integration is achieved through a conditionally stable explicit scheme.

Description of the interface

The following features are currently available:

• Support for finite strain behaviours
  • Small strain behaviours can be embedded though finite strain strategies: currently, MFront provides the FiniteRotationSmallStrain and the MieheApelLambrechtLogarithmicStrain strategies (see [4];[5])
• Europlexus is able to analyse the generated library to get helpfull information about the mechanical behaviour:
  • number and name of material properties
  • number, names and type of internal state variables
  • number and names external variables
  • symmetry of the behaviour (isotropy, orthotropy)
  • etc…
• An example of input file is automatically generated to help the user in assigning a MFront behaviour to a material.

Example of generated input file fragment

The following listing gives an example of generated input file fragment for an axisymmetric modelling hypothesis:

MFRONT
LIB 'libEuroplexusBehaviour.so'
LAW 'LogarithmicStrainNortonCreep'
!! material properties
MATP 'YoungModulus' ???
MATP 'PoissonRatio' ???
MATP 'A' ???
MATP 'E' ???
!! internal state variables
!! by default, internal state variables are set to zero
!! IVAR 'ElasticStrain'  ??? ??? ??? ???
!! IVAR 'EquivalentViscoplasticStrain'  ???
!! external state variables
EVAR 'Temperature' 293.15
LECT MESH TERM

The user must replace each occurrences of ‘??’ by appropriate values.

Qualification