I am studying the behaviour of cylindrical shells under bending loads. I simulated in Abaqus a straight cylinder of length = 100 , radius = 2 and thickness =0.05 . S4R elements are used. The cylinder has one end fixed and the other is free. (Rigid body kinematic conditions are applied in a reference point in middle of cross section at both ends). A displacement load is applied at free end and a geometric non-linear analysis is followed.
The model under bending load is subjected to ovalization of its cross section. My question is how can I measure this ovalization and how can I find the moment distribution across the cylinder in order to find at which moment the collapse occurs?
You can use the Riks solver in Abaqus. Regarding the extraction of bending moments, there are many videos on youtube.
Yiheng Song Riks solver is for solving and obtain post-buckling behavior. I want to find a way to calculate the ovalization of cross section and the moment distribution at bifurcation point.
As far as I know, Abaqua solver will give you stess distribution as an output. You need to post process to find the moment distribution. For example, in your case, you can store the coordinates os the section of interest, you can locate the neutral axis by finding major and minor axis of the oval. Using standard beam formula (Moment= stress*I/z) you can estimate the moment at any location z from neutral axis.
Shubham Agarwal I was thinking to use free body cut module in order to take moments . I want to check is the current moment is closer to Brazier moment.Using beam formula as you mentioned is kind of confusing at wich stress component should I take.
Regarding on ovalization calculation, I was thinking ton measure the distance between 2 nodes in deformed state (these nodes where parallel to each other in undeform configuration).
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