Visualization of Drucker - Prager plasticity surface in principal stress space

What can be modified:
  • yield stress in shear, τ0,
  • coefficient of internal friction, α
  • the choice of displayed elements - it si possible to show or hide
    • section corresponding to plastically admissible area for plane stress,
    • axes corresponding to principal stresses,
    • hydrostatic axis,
    • plasticity surface itself.
  • View direction on the 3D picture can be modified with mouse (placing cursor on the picture, drag and drop).
  • It is also possible to choose a predefined view:
    • parallel to one principal stress axis (button "|| σ3"),
    • perpendicular to hydrostatic axis (button "⟂ (σ1=σ2=σ3)"),
    • parallel to hydrostatic axis (button "|| (σ1=σ2=σ3)").
  • Drucker-Pragerovy plasticity surface is a right circular cone with the top on hydrostatic axis.
  • The section corresponding to plane stress results in ellipse.
  • The deviatoric section results in circle.
  • While modifying cohesion, the cone is translated along hydrostatic axis.
  • While modifying internal friction angle, the top angle of the cone is changed.
  • For zero coefficient of internal friction, the cone transfers to cylinder corresponding to Mises plasticity surface.
Contact: jan.stransky(at)
Last update: 25th September 2018
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