lizhengcalvin
Petroleum
- Sep 26, 2013
- 2
Hello all,
This is my first thread here.
Briefly, I want to take surface-to-surface open/close contact into account during linear natural frequency analysis. I thought this was impossible. But it seems that a method called "normal nonlinear modes" could be used to partly resolve this problem, and it is implemented in NASTRAN. Here's the thread which explains it:
[URL unfurl="true"]http://www.eng-tips.com/viewthread.cfm?qid=325574[/url]
It seems that NASTRAN detects the interpenetrated area in a previous static step and then in the frequency extraction step, it sets equivalent springs (stiffness matrix) between the two potentially contacting surfaces.
My question is: Is it possible to do a similar simulation under Abaqus? All suggestions are welcomed.
My colleagues told me that a complex frequency step could be the solution. He's quite confident about his answer. I searched in the Abaqus documentation and found that it was rather used for modeling frictional contact, but not open/close contact in which I'm particularly interested.
Again, all suggestions are welcomed. I will really appreciate your help.
This is my first thread here.
Briefly, I want to take surface-to-surface open/close contact into account during linear natural frequency analysis. I thought this was impossible. But it seems that a method called "normal nonlinear modes" could be used to partly resolve this problem, and it is implemented in NASTRAN. Here's the thread which explains it:
[URL unfurl="true"]http://www.eng-tips.com/viewthread.cfm?qid=325574[/url]
It seems that NASTRAN detects the interpenetrated area in a previous static step and then in the frequency extraction step, it sets equivalent springs (stiffness matrix) between the two potentially contacting surfaces.
My question is: Is it possible to do a similar simulation under Abaqus? All suggestions are welcomed.
My colleagues told me that a complex frequency step could be the solution. He's quite confident about his answer. I searched in the Abaqus documentation and found that it was rather used for modeling frictional contact, but not open/close contact in which I'm particularly interested.
Again, all suggestions are welcomed. I will really appreciate your help.
