1. Reference problem

1.1. Geometry

It is a material point, treated by SIMU_POINT_MATen 3D or in D_ PLANselon modeling or with a single element and STAT_NON_LINEpour COQUE_SOLIDE.

1.2. Material properties

The material obeys the law of fragile elastic behavior ENDO_LOCA_EXP. The macroscopic data correspond to:

\(E=34129\text{MPa}\)	Young’s module
\(\nu =0.2\)	Poisson’s ratio
\({G}_{f}=0.142{\text{N/mm}}^{2}\)	Cracking energy
\(p=2\)	Shape parameter
\({f}_{t}=3.024\text{MPa}\)	Traction limit
\({f}_{c}=40\text{MPa}\)	Compression limit
\({L}_{f}=200\text{mm}\)	Inter-crack distance

The internal parameters of the model are calculated by the macro command DEFI_MATER_GC.

1.3. Boundary conditions and loads

It is a request at a material point (SIMU_POINT_MAT). All deformation components are imposed; they are all zero except for EPXX. We start by imposing a uniaxial tensile deformation and then unloading until a compression deformation is imposed in order to verify the effect of the restoration of stiffness under compression.

1.4. Initial conditions

None.