FLAC3D Principal Stress input

FLAC3D
1

Hello,

What is the proper syntax to use the zone initialize stress-principal command? I want to input my principal stresses at an angle but I can’t figure out the syntax. I tried:

zone initialize stress-principal direction-maximum (0.5,0,0.5)
zone initialize stress-principal direction-minimum (0.5,0,0.5)

also:

zone initialize stress-principal direction-maximum (0.5,0,0.5) direction-minimum (0.5,0,0.5)

and other combinations of the same. All give me the following error:

image

cheers,

2

At first glance I would guess the problem is that your directions for the principle directions are the same, which does not make sense.

3

Hi!

Thanks, I didn’t see that. However, even if I input something like:

zone initialize stress-principal direction-maximum (1,0,0) 
zone initialize stress-principal direction-minimum (0,0,1) 
zone initialize stress-principal direction-intermediate (0,1,0)

or

zone initialize stress-principal direction-maximum (1,0,0)  direction-minimum (0,0,1)  direction-intermediate (0,1,0)

I get the same error

4

Need to assign three principal values and two principal directions to define a tensor, e.g.,

zone initialize stress-principal minimum -300 intermediate -200 maximum -100 direction-minimum 1 1 0 direction-intermediate 0 1 0

1 Like
5

The principal stress required magnitude assignment, for example;

zone initialize stress-principal -30 direction-maximum (1,0,0)
zone initialize stress-principal -15 direction-minimum (0,0,1)
zone initialize stress-principal -24 direction-intermediate (0,1,0)

The direction cosines required are only 2, here you included 3 of them.