quantity.observables.stiffness_tensor_components_cubic_crystal#
- stiffness_tensor_components_cubic_crystal(stiffness_tensor)[source]#
Computes the 3 independent elastic stiffness components of a cubic crystal from the whole stiffness tensor.
The number of independent components in a general stiffness tensor is 21 for isotropic pressure. For a cubic crystal, these 21 parameters only take 3 distinct values: c11, c12 and c44. We compute these values from averages using all 21 components for variance reduction purposes.
- Parameters:
stiffness_tensor – The full (3, 3, 3, 3) elastic stiffness tensor
- Returns:
A (3,) ndarray containing (c11, c12, c44)