# Constant Stiffness Block

Constant Stiffness blocks store the translational or rotational stiffness for a given direction.

The following table describes the parameters stored in a Constant Stiffness block. Abbreviations are: [A] = angle dimension, [F] = force, [L] = length.

Parameter | Type | Dimension FX, FY, FZ | Dimension TX, TY, TZ |
---|---|---|---|

K | real | [F][L^{-1}] |
[F][L][A^{-1}] |

If the direction block selects the constant stiffness formulation for the FZ
direction, then the property file, for example, must contain a
`[CONSTANT_STIFFNESS_FZ]`

block. The form of the block is:

```
[CONSTANT_STIFFNESS_FZ]
K = 6000.0
```

The dimension for stiffness for translational directions is [F][L^{-1}] and
for rotational directions [F][L]. When read from the property file, the stiffness is
converted from the units defined in the property file to the solver model units.