How to define the Field Variable in a Correct Way?

[SKSA]

Hi there,

I would like to define two field variable. First Field variable is the step time and second one is the plastic shear strain. So, I would like to vary the angle of internal friction as well as the cohesion with the step time and plastic strain. I have three step. First step time is 0.001, Second step time is 5 sec and third one is 30 sec.

I am analyzing a slope with CEL technique. So, I have to reduce the strength at a specific region and other part too.

Here I am attaching a photo where the FV1 is the step time and FV2 is the Plastic strain. I can call the field variable through the subroutine but I want to define it correctly in input file. How to define them?

 

[FEA way]

Which software are you using ?

 

[SKSA]

I am using ABAQUS.

 

[rb1957]

But you only have data (column 1) for FV2 = 0

You're trying to define "Angle of Internal Friction" as a function of two variables ("step time" and "plastic strain") ... something like AIF = A*FV1+B*FV2.
You need more than 1 data for each of the FV to be able to define the rate of change with respect to that variable (dAIF/dFV2).

 

[SKSA]

Sounds like very interesting. But I don't know how to define like this. can you please describe through an example? It would be very much appreciated.

 

[rb1957]

you can't (IMHO) define it ... you don't have enough data. How does the "Internal Friction Angle" change as "plastic strain" changes ? Ideally you want the angle for the same three "step time" values but with a different "plastic strain" value.

 

[SKSA]

I want to eroded a portion of that model so that some plastic strain will create. Based on that the internal angle of friction will be changed. And Field variable 2 is my plastic strain.