von Mises

The von Mises model is based on the criteria that material yielding is initiated when the octahedral shear stress reaches a critical value. The model is mainly applicable to ductile materials such as metal; anchor, nail and pipe pile made out of steel and to truss, embedded truss and plate elements.

Applicable Modules:

General Parameters

Modulus of Elasticity (E)

The slope of the stress-strain line for a linear isotropic material.

Poisson's Ratio (u)

The ratio of the radial (or lateral) strain to the vertical strain.

Temperature Coeff. (α)

The relative change of a physical property when the temperature is changed by 1 K.

Unit Weight (Υt)

The weight of soil per unit volume.

Saturated Unit Weight (Υsat)

The weight of saturated soil per unit volume.

Earth Pressure Coeff. (Ko)

The ratio of horizontal principal effective stress to the vertical principal effective stress.

Draining Condition

Drained

Dissipation of pore water pressure takes place upon the load application.

Undrained

Dissipation of pore water pressure does not take place upon the load application.

Skempton 'B' Coefficient

Enter the value of the coefficient for an 'Undrained' condition.

Additional Parameters

Yield Stress

                                    Uniaxial compressive stress.

Safety Factor Calculation

The safety factor is calculated on the basis of the ratio of the current state of stress of the material to the Mohr-Coulomb failure criterion.  The Mohr-Coulomb failure criterion is most widely used criterion for brittle materials like ground.  SoilWorks uses the criterion for all the material models in the Tunnel Module.