: This describes the direction and relative magnitude of plastic strain increments once yielding occurs.
: The yield surface expands uniformly, representing an increase in strength. fundamentals of plasticity in geomechanics pdf
: Used when a material's volume change (dilatancy) does not follow the yield surface, which is a hallmark of many granular soils. : This describes the direction and relative magnitude
: These rules describe how the yield surface evolves as the material deforms. : These rules describe how the yield surface
Modern geomechanics relies on sophisticated constitutive models that bridge the gap between theory and field observations. Plasticity Theory For Anisotropic Rocks And Soil - OnePetro
Plasticity theory replaces real, particulate materials (like sand or clay) with an idealised continuum that behaves elastically until a specific stress limit is reached. Key elements of this theory include:
: Traditionally used for metals but adapted for certain cohesive soils like undrained clay.