abaqus is not recognising my imperfection input from buckle analysi
abaqus is not recognising my imperfection input from buckle analysi
(OP)
Hi all,
I ran a buckle analysis to get the buckling modes and then copied the .fil and .prt files with the cae file to a new folder, renamed the .fil and .prt files. I also replaced the buckle step with a Rik's analysis step. I then remove the modal file and node file commands in my keywords. After doing all these I ran the risk analysis, the structure just behaves like there is no imperfection inputed. So, I thought to remove the imperfection file and the structure behaves excatly the same way. I dont know why Abaqus doesnt recognise the imperfection.
PLEASE HELP.
I ran a buckle analysis to get the buckling modes and then copied the .fil and .prt files with the cae file to a new folder, renamed the .fil and .prt files. I also replaced the buckle step with a Rik's analysis step. I then remove the modal file and node file commands in my keywords. After doing all these I ran the risk analysis, the structure just behaves like there is no imperfection inputed. So, I thought to remove the imperfection file and the structure behaves excatly the same way. I dont know why Abaqus doesnt recognise the imperfection.
PLEASE HELP.





RE: abaqus is not recognising my imperfection input from buckle analysi
Martin Stokes CEng MIMechE
RE: abaqus is not recognising my imperfection input from buckle analysi
RE: abaqus is not recognising my imperfection input from buckle analysi
Did you use the first buckling mode as the trigger, or a combination of modes?
What scaling factor are you using, and how did you decide what factor to use? For shells, I use a percentage of the shell thickness to start, say 10%.
I used to try a number of scaling factors, and then plot them against the collapse load to see what effect it was having on the structure.
Martin Stokes CEng MIMechE
RE: abaqus is not recognising my imperfection input from buckle analysi
I tried running the Riks analysis without the imperfection file, and the results i am getting is exactly the same as when i included the imperfection file, so i presume its not seeing it at all.