ABAQUS/Explicit: Obtaining strain rate of individual element

[ShadowWarrior]

I am trying to find out the total strain rate of an individual element.

From ABAQUS documentation -

http://50.16.225.63/v6.14/books/usb/default.htm?startat=pt02ch04s02xbv01.html

ER
All logarithmic strain rate components.
.fil: yes .odb Field: yes .odb History: yes

These are the output options -

Which one of these options should I use? Is there any formula to combine the ER_ij tensor components to get an unified value similar to von Mises stress?

 

[ShadowWarrior]

Help appreciated.