doc:user:general:unites
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Units
The unit system must be consistent:
| SI | SI (mm) | |
|---|---|---|
| Lenght | $\mbox{m}$ | $\mbox{mm}$ |
| Force | $\mbox{N}$ | $\mbox{N}$ |
| Mass | $\mbox{kg}$ | $\mbox{tonne}$ |
| Time | $\mbox{s}$ | $\mbox{s}$ |
| Stress | $\mbox{Pa } \left ( \mbox{N}/\mbox{m}^2 \right ) $ | $\mbox{MPa } \left ( \mbox{N}/\mbox{mm}^2 \right ) $ |
| Energy | $\mbox{J}$ | $\mbox{mJ } \left ( 10^{–3} \mbox{J} \right ) $ |
| Density | $\mbox{kg/m³}$ | $\mbox{tonne} / \mbox{mm}^3$ |
Units are not explicitly defined, the user must enter its data in a consistent way. For example, if the geometry is expressed in meters and the boundary conditions in Newton, Young Modulus must be in $\mbox{N/m}^2$. Likewise, a geometry in meters and a Young Modulus in $\mbox{kg/m}^2$ lead to forces in $\mbox{kg}$.
doc/user/general/unites.1407336853.txt.gz · Last modified: 2016/03/30 15:22 (external edit)