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stress and displacement in linear buckling analysis

Rahul_P1

Hello,

I created a model and set up a linear buckling analysis as shown in the tutorial 'RD-1040: 3D Buckling Analysis using RADIOSS' ( I use Optistruct as solver and another geometry). My objective is to be able to see the stress and displacement from the different buckling modes. At the moment I am only able to see the stress and displacement of the linear static subcase and the buckling modes without the result type of stress and displacement. I tried to follow the instructions from the videotutorial for creating a Tower buckling, because at the end he is able to show the stress and displacement for the buckling modes (http://youtu.be/BueeQiwc0JY?t=13m58s), but I dont have the same options of card editing the loadstep as shown in the video (http://www.youtube.com/watch?v=BueeQiwc0JY&feature=youtu.be&t=7m18s ;maybe because there was used Hyperworks 10 and I work with Hyperworks 12 in my university?).
How do I have to change the options in the card edit panel of the buckling loadstep to be able to see the stress and displacements from the buckling modes in Hyperview, or do I have to change something else?

Thanks in advance!

Dominik

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Rahul_P1

Dominik,

Firstly the user in the videos you describe uses nastran to solve and postprocesses its op2 result file, this gives him the displacement and stress results for different buckling modes individually

When you use optistruct, even with the above options you will see no displacement and stress results for different buckling modes in its H3D. The stress and displacement results are given in the linear subcase as this is part of the buckling analysis loadstep as well.

When you card edit your buckling loadstep and select the stress and displacement in the output section, choose format as op2 and then post process this op2 to see displacement results for different buckling modes, this however is the same result you get in the h3d buckling mode result type contour. the contour for each buckling mode result type will correspond to the displacement contour for each buckling mode, exactly.
please verify this with your model and get back to us.

Rahul_P1

Thanks for your responses,

I got the task to display the different buckling modes of my model and if possible, to show the stress and displacements in each buckling mode. I wasn´t aware that the buckling mode/factor coressponds to the displacement and stress contour. I verified it as you suggested. With this information i think, that the buckling mode results are sufficient for my given task. Thanks for your help and keep up the good work!