Question regarding units in Abaqus

[moonmoon2007]

Hello All,
I have a question regarding units:

I have the length in ( micrometer )

Young’s modulus and yield stress in ( MPa )

I am using DLOAD subroutine to apply Pressure

The Pressure is a function of distance ( which in micrometer ) and Adhesion Energy

The Adhesion Energy is energy/unit area

If I want to use Adhesion Energy = 1 J/m^2

What value I should enter with the above unit system to be consistent

THANKS to every one

 

[bassmanjax]

According to my units 'ready reckoner';

If the base units are;

Length - micrometres µm
Force - micronewtons µN
Time - seconds (s)

then;

Energy is in pJ (1e-12 J)

Should be able to work out the adhesion energy from that

Regards

Martin Stokes CEng MIMechE

 

[rstupplebeen]

Has anybody found or written a program to figure this out? People seem to always have goofy units.

 

[MNS747]

Afterwards what bassmanjax said i think J should be changed into mJ if you are using MPa.

Regards

 

[bassmanjax]

I know what you mean rstupplebeen - I do nearly all my modelling in N mm and s so I usually have to scratch my head to figure out other unit schemes

The PDF I keep pinned up is this one, from PolymerFEM.com

Regards

Martin Stokes CEng MIMechE

 

[rstupplebeen]

Martin,

I use the same units and try to not deviate. That is a good sheet. Attached is what I have compiled. I do not remeber where I found it all but I think one of the pages was from LS-DYNA. Enjoy.

Rob Stupplebeen

 

[moonmoon2007]

Hello every one ,

I really want to Thank all of you for your helpful information .

Thanks