Units to be used in structural analysis
Units to be used in structural analysis
(OP)
Hi
I am confused with units in a structural analysis. I have modelled the geometry in mm (keypoints selected assuming mm dimensions).
It is a tube subjected to internal pressure.
I need to apply the following loads and get deflection in mm? What are the units I should follow?
1) Youngs Modulus
2) Density
3) Gravity (Unit of acceleration)
4) Internal pressure
5) External force.
6) Thermal expansion
7) Thermal conductivity
Pls help
I am confused with units in a structural analysis. I have modelled the geometry in mm (keypoints selected assuming mm dimensions).
It is a tube subjected to internal pressure.
I need to apply the following loads and get deflection in mm? What are the units I should follow?
1) Youngs Modulus
2) Density
3) Gravity (Unit of acceleration)
4) Internal pressure
5) External force.
6) Thermal expansion
7) Thermal conductivity
Pls help





RE: Units to be used in structural analysis
If you work in mm, just be sure you units are consistent, i.e :
1) MPa
2) kg.mm-3
3) kg.mm.s-2
4) MPa
5) N
For thermal units, I don't remember them, but as for structural ones, check that they are consistent.
RE: Units to be used in structural analysis
But, i think , for point 3, the unit is wrong..
Should i specify gravity in 9.81m/s2 or 9810 mm/s2
Pls confirm
Can you also specify why density needs to be in kg/mm3 where as all other items are in N, MPa etc.
Or is it shall be in N/mm3
Reply pls.
Thanks a lot.
RE: Units to be used in structural analysis
For density, simply because a density is in kg/mm3, so that if you multiply it by the volume of your body you get your mass.