How to use User Subroutine, "SIGINI", to define initial stress on beam element, B33 ?

[Steven1983]

Hi,

I am modeling a simple supported I section beam with only one B33 element. In default ,this model with one B33 element will have 3 integration points along the length directions, and each integration point will have 13 section integrations points on the cross section.

I am trying to use " *initial condition , type=stress, USER" to define the initial stress. However, I am not sure how to do it.

I know I should create a "xxx.for" first. However, I am not sure about how to write the codes to assign the stress on specific section integration points at the specific integration point along the length directions . For example, I will like to assign normal stress, S11 = -10, on section points 1, 5, 9, and 13 at integration point,2.

Can anyone kindly give me some hint?

Steven

 

[Staszkinson]

First of all you need Fortran Compiler connected with Abaqous.
Have you tried to compile any source code .for using Abaqus?