Learning Forum

[lucas.bienert]

Hi,

I have created a code snippet in my static structural analysis, which is executed at every load step. The point is to evaluate the results of the previous load step and change the load for the next load step accordingly (in my case, iteratively determine the load where the first element reaches a Tsai-Wu failure criterion value of 1). To do this, I have to add the commands /post1 and set,previous to read the results from the previous load step. Now, the problem is that Ansys then gets stuck at this load step and solves the selected load step again instead of the next one, as it should. How can I tell Ansys to procede with the next load step? Or is there a different workaround? Any help weill be appreciated! Here is my code so far... If it helps, I can share more information. Thanks in advance!

 

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! Commands inserted into this file will be executed just prior to the ANSYS SOLVE command.

! These commands may supersede command settings set by Workbench.

 

! Active UNIT system in Workbench when this object was created: Metric (mm, kg, N, s, mV, mA)

! NOTE: Any data that requires units (such as mass) is assumed to be in the consistent solver unit system.

! See Solving Units in the help system for more information.

 

! check the load step

*get,load_step,active,,set,lstp

 

! start the iteration after the first load step

*if,load_step,ge,1,then

 

(...)

 

! start the postprocessor and activate the previous load step

/post1

set,previous

 

(...)

 

! get average element stresses

etable,sigma_x,s,x

etable,sigma_z,s,z

etable,tau_xz,s,xz

 

! calculate tsai-wu values and the next load

(...)

 

! clear element table

etable,eras

 

! go to the preprocessor to save the loads for the next round

/prep7

 

! save the current load (P) and the determined next load (P_nxt)

! as real constants for the next round

r,101,P,P_nxt

 

! go to the solution processor

/solu

 

! reselect everything

allsel

 

! scale the load to the new P

factor_P = P_nxt / 10000

sfscale,pres,factor_P,factor_P

 

! activate the next load step .......

 

*endif

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