Implicit backward-eulerian nonlinear integration

Advantage: Efficient and precise

Reference:
Belytschko et al. "Nonlinear Finite Elements for Continua and Structures"

Explicit nonlinear integration

Advantage: Stable

Reference:
Owen & Hinton£¬"Finite elements in plasticity"

Uniaxial compression with different hydraulic pressure

Poisson ratio in uniaxial compression

Plastic strain in a slope

Tri-axial compression

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