Nonlinear material problem in ANSYS Workbench

[Anders Johnsen]

I'm currently conduction a nonlinear analysis of a partially buried, cylindrically shaped sump-system. I've decided to best simulate the stresses on the sump by modelling a shallow cylinder with gravel-properties around it and a cube with soil-properties surrounding both sump and gravel.

As I'm writing my bachelor's thesis in mechanical engineering, soil mechanics is not my field of study. As a result, I've approximated some values from an external program, CivilFEM.

However, I don't seem to be able to solve the model after adding the nonlinear Mohr-Coloumb properties to engineering data.

The data from CivilFEM is as follows;
Name: "Sand - well graded"

Type: Soil

E: 8e+07 Pa

ν: 0.3

ρ: 2038.74 kg/m³

G: 3.07692e+07 Pa

α: 1e-05 1/ΔK

Act. time: 0 day

Deact. time: 36500 day

Plastic behavior: Mohr-Coulomb

Densities
ρ type: Apparent

γ dry: 20000 N/m³

γ solid: 20000 N/m³

γ apparent: 20000 N/m³

γ submerged: 10190 N/m³

γ saturated: 20000 N/m³

γ water: 9810 N/m³

ρ dry: 2038.74 kg/m³

ρ solid: 2038.74 kg/m³

ρ apparent: 2038.74 kg/m³

ρ submerged: 1038.74 kg/m³

ρ saturated: 2038.74 kg/m³

ρ water: 1000 kg/m³

Porosity: 0

Void ratio: 0

Water content ratio: 0

Saturation grade: 0

Mohr-Coulomb
Eff. Cohesion: 0 Pa

Φ: 30 °

Hyperbolicity: 0 Pa

Autocalculate hyperbolicity parameter: Marked

Non-associative flow rule: Unmarked

Damping
Automatic: Marked

α: 0 1/s

β: 0 s

Damping: 0 %

ω min.: 0.1 1/s

ω max.: 100 1/s

The data was input to ANSYS Workbench as shown on the picture.

Why won't the model solve? Is this due to the mix between linear properties and nonlinear properties?

Any help would be appreciated

 

[Navin A S]

! It is possible that the mix of linear and nonlinear properties is causing issues with the model. The Mohr-Coulomb parameters you inputted may not be compatible with the soil properties you have chosen, or the Mohr-Coulomb parameters may not be properly configured. It is also possible that the damping parameters are not set up correctly. If these settings are incorrect, the model may not be able to accurately simulate the stresses on the sump. You may need to adjust the settings or choose different soil properties in order for the model to solve. Additionally, you may need to make sure the model is properly meshed, as an improper mesh can lead to problems with solving the model.