I prepare a direct transient analysis in work. I have got a important problem because I´m not sure about the units of results. That´s why I`m asking You for help. Have anybody a table or note about the input and output units in FEMAP? Could you explain me how to use a units in FEMAP? Especially I am interesting in a units of frequency and acceleration.
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About the units the user must take care abut them. I use always:
- mass (M): tonnes
- time (T): seconds
- length (L): mm
Then you get stresses in MPa (N/mm2), frequency in Hz (1/sec) and acceleration in mm/sec2
Femap doesn't use any units. Units of your results depend of your input units.
For example if you use N as force and mm as lenght unit, you get stress results in MPa (N/mm2). See earlier post, f.e.
Thanks for your answer! I would like to ask for something else, what about acceleration? I have to make a half-sine function. And it is a chart acceleration vs. time. Time is in seconds but in which unit shall I signify the second axis to get mm/s2 in result? Now I have got just a m/sec2 but I am getting wrong results.
If you use as input:
- Mass in tonnes
- length in mm
- time in seconds
acceleration then must be in mm/sec2
the outputs are:
- force in Nw
- stresses in MPa
- acceleration should be in mm/sec2
Only saw the above post recently...
The short explanation for Femap units (also relevant to any other "unit-free" = "consistent units" FEA code) is here:
The detailed explanation including tables of metric / imperial + mech / thermal is here: