type: Hooke
references:
  - L. Wang et al.,
    Acta Materialia 132, 598-610, 2017,
    10.1016/j.actamat.2017.05.015
C_11: 162.4e9
C_33: 181.6e9
C_44: 47.2e9
C_12: 92e9
C_13: 69e9