The aim of this test case is to validate the following functionalities:
creep material behavior
standard and reduced integration elements
automatic time stepping
The simulation results of SimScale were compared to the analytical results in [NAFEMS_R27]. The tetrahedral meshes used were created with the parametrized-tetrahedralization-tool on the SimScale platform.
creep formulation: Time Hardening, A = 2.6041667e-46, n = 5, m = -0.5
The material Data of the reference was given in MPa, mm and h units and were converted to SI units using the following relation:
for the parameters as given in followig Time Hardening formulation:
face ADEH: dx=0.0
face ABFE: dy=0.0
face ABCD: dz=0.0
face BCGF: σxx
= 300 MPa
face CDHG: σyy
= 200 MPa
face EFGH: σzz
= 100 MPa
Advanced Automatic Time Stepping:
Retiming Event: Field Change
Target Field component: internal variable V1 (accumulated unelastic strain)
Threshold value: 0.0001
Timestep Calculation Type: mixed
Field Change Target Value: 0.00008
The equations used to solve the problem are derived in [NAFEMS_R27]. As the SimScale solution is calculated using SI units, the reference solution was adopted to a time unit of seconds instead of hours.
Comparison of the average creep strain ϵcxx
of the cube after a creep time of 3.6e6 s (1000 h) with the analytical solution presented in [NAFEMS_R27]:
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