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.(adsbygoogle = window.adsbygoogle || []).push({});

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 dont 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;

: "Sand - well graded"Name

: SoilType

: 8e+07 PaE

: 0.3ν

: 2038.74 kg/m³ρ

: 3.07692e+07 PaG

: 1e-05 1/ΔKα

: 0 dayAct. time

: 36500 dayDeact. time

: Mohr-CoulombPlastic behavior

Densities

: Apparentρ type

: 20000 N/m³γ dry

: 20000 N/m³γ solid

: 20000 N/m³γ apparent

: 10190 N/m³γ submerged

: 20000 N/m³γ saturated

: 9810 N/m³γ water

: 2038.74 kg/m³ρ dry

: 2038.74 kg/m³ρ solid

: 2038.74 kg/m³ρ apparent

: 1038.74 kg/m³ρ submerged

: 2038.74 kg/m³ρ saturated

: 1000 kg/m³ρ water

: 0Porosity

: 0Void ratio

: 0Water content ratio

: 0Saturation grade

Mohr-Coulomb

: 0 PaEff. Cohesion

: 30 °Φ

: 0 PaHyperbolicity

: MarkedAutocalculate hyperbolicity parameter

: UnmarkedNon-associative flow rule

Damping

: MarkedAutomatic

: 0 1/sα

: 0 sβ

: 0 %Damping

: 0.1 1/sω min.

: 100 1/sω max.

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

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# Nonlinear material problem in ANSYS Workbench

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