[Karamba] Principal stress lines

Hi Karamba Users!

I am currently working on principal stress lines but I don't understand how to improve line's precision.

I made a shell with large deformation of a plate supported on 4 edges (deformed mesh into brep) and I try to create "clean" principal stress lines on it (see photo attached and grasshopper file).

I have some trouble at the top of the shell where the lines are messy, is it due to the curvature? How can I improve the precision of the lines?

Thank you very much!

Francois

Attachments:

Shell_4_corners.png, 536 KB
Shell_4_corners.gh, 413 KB

Replies to This Discussion

Permalink Reply by Karamba3D on May 31, 2016 at 12:28am

Hi Francois,

it seems like there are gaps in your shell which cause the irregularities (see attached definition).

Best,

Clemens

Attachments:

Shell_4_corners_cp.gh, 413 KB

Permalink Reply by Francois Latour on June 3, 2016 at 6:20am

Hi Clemens!

Thank you very much. It seems that the definition of my shell was bad (deformed mesh converted into NURBS). I re-patched it and it is far better!

Best,

Francois

Permalink Reply by abdullah y. ibrahim on November 23, 2017 at 10:31am

how can you explain or describe those lines in relation to the structure? as tension and compression stress lines.

Permalink Reply by Karamba3D on November 23, 2017 at 12:47pm

Dear Abdullah,

the principal stress lines are formed by integrating the directions of the first and second principal stresses of a two-dimensional stress state on a layer of a shell. They give the direction of the largest and smallest in-plane normal stress in each point they pass.

Best,

Clemens

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