Logarithmic rate based elasto-viscoplastic cyclic constitutive model for soft biological tissues

- An elasto-viscoplastic constitutive model is developed at finite deformation.
- Piecewise linearization theory is introduced in the hypo-elastic relations.
- Anisotropy is considered by some parameters dependent on the load direction.
- Anisotropic monotonic deformations of soft tissues are reasonably described.
- Uniaxial ratchetting of soft tissues is well predicted.