Material units

[material_girl]

Hi,

I am attempting to figure out why my explicit model is progressing so slowly. I have tried mass scaling, but it has not helped much. Could someone tell me if my material parameters are correct? My geometry is in mm, so the units I have chosen are:

conductivity: W/mm*k (for example: 0.0298174 at 310 degrees C)


Young's modulus: N/10^6 mm^2 (example: 188053.95 at 310 degrees C)

density: kg/mm^3 (example: 7.64E-06 at 310 degrees C)

specific heat: J/kg*k (example: 610.42 at 310 degrees C)

Thank you

 

[FEA way]

Consistent commonly used SI(mm) units are:
- Young’s modulus [MPa]
- density [tonne/mm^3]
- thermal conductivity [mW/mm*K]
- specific heat [mJ/tonne*K]

If you search for "Abaqus units" you will find some helpful tables with other consistent unit systems.

 

[Vishakh_Rajendran]

Hello,

Can you clarify whether your Young's modulus is in Pa or MPa or GPa. It is unclear from your description.

Example - If my Young's modulus is 20 GPa, and if I use 'mm' for length, I should define the material properties in the 'MPa scale' as this is what directly correlated to 'mm' (provided your Force is in 'N'). So, I will define the Young's modulus as 20 e3 to the ABAQUS input (that is, 20e3 MPa).

So, E is in MPa if 'mm' scale (and) E is in Pa when using the 'm' scale.

Best Regards,

Vishakh.