type: Hooke
references:
  - S.A. Kim and W.L. Johnson,
    Materials Science & Engineering A 452-453:633-639, 2007,
    https://doi.org/10.1016/j.msea.2006.11.147
C_11: 268.1e+9
C_12: 111.2e+9
C_44: 79.06e+9