gs.materials.FEM.Muscle#

class genesis.engine.materials.FEM.muscle.Muscle(E=1000000.0, nu=0.2, rho=1000.0, model='linear', n_groups=1, friction_mu=0.1, contact_resistance=None)[source]#

Bases: Elastic

The muscle material class for FEM.

Parameters:

  • E (float, optional) – Young’s modulus, which controls stiffness. Default is 1e6.

  • nu (float, optional) – Poisson ratio, describing the material’s volume change under stress. Default is 0.2.

  • rho (float, optional) – Material density (kg/m^3). Default is 1000.

  • model (str, optional) – Constitutive model to use for stress computation. Options are: - ‘linear’: Linear elasticity model - ‘stable_neohookean’: A numerically stable Neo-Hookean model Default is ‘linear’.

  • n_groups (int, optional) – Number of muscle groups. Default is 1.

  • friction_mu (float, optional) – Contact friction coefficient for IPC/SAP coupling. Default is 0.1.

  • contact_resistance (float | None, optional) – IPC contact resistance/stiffness override. None uses the coupler global default. Default is None.

property stiffness#

Muscle stiffness. Equivalent to Young’s modulus.

property n_groups#

Number of muscle groups.