I have updated the video with timecodes for better and faster overview: Timecodes: 0:00 - Intro 0:44 - Analytical Buckling Analysis 5:09 - Create CAE model in ABAQUS 6:57 - Define Material data, Assign Material and Thickness 7:53 - Assembly definition 8:00 - Define Analysis Step (Linear Buckling) 8:20 - Create Boundary Conditions and Loading 9:21 - Mesh 9:53 - Create Job 1 - Linear Buckling 10:10 - Create Nonlinear Analysis (Riks) 10:47 - Modify Pressure Load 11:07 - Create Job 2 - Non-Linear Buckling 11:25 - Modify Output (Pressure) 12:38 - Create Models with dimple Imperfection 16:30 - Create Models with cutout Imperfection 20:47 - Numerical results (linear) 21:50 - Comparison with analytical solution 22:45 - Numerical results (nonlinear) 24:05 - Numerical results (dimple) 25:50 - Numerical results (cutout) 27:00 - Numerical results (real measured imperfections)

what kind of tutorial with spherical shells you want to see next ? comment below !

@sajidsarabi5748

Жыл бұрын

sir parabolic space seeing steel framed with glass roof of L=35M with Bow Height of 5.5M can you pleas make a video on above example for bulking analysis.

@hnrwagner

Жыл бұрын

@@sajidsarabi5748 I need a reference/paper or atleast a figure

@sajidsarabi5748

Жыл бұрын

@@hnrwagner oky i will share in a pdf file so please send me email or any other means to share the file.

@hnrwagner

Жыл бұрын

@@sajidsarabi5748 ro.wagner@tu-braunschweig.de

I have added here a repository for the excel file with all the equation for spherical shell buckling from the video: github.com/hnrwagner/Sphere_Pressure/blob/main/Shell_Buckling_002.xlsx

thank you sir for this innteresting video,sir i have one question about riks method, sir i have modeled hollow sphere under internel pressure uding hyperfoma material, my problem i dont know how plot pressure fonction deformed raduis ,and i need the curve after reache max pressure decrases

Hello Dr. Wagner, thank you so much for this video. How do you create a GNA model with initial imperfection? Do you use a python script to input it in Abaqus?

@hnrwagner

Жыл бұрын

no I got this one from a chinese research grp, it was already an input file

@hnrwagner

Жыл бұрын

a video for artifical imperfections is given here: kzread.info/dash/bejne/X2x7k6ehYaWWc7g.html

Sir, How do we plot the volume of the whole model with respect to arc length

Hello Prof. Wagner, is it possible to have some tutorials about FSI Simulation in Abaqus?

@hnrwagner

2 жыл бұрын

not likely because I have never worked with it, I am a structural engineer first :)

Hello Dr Ronald, how would we analyze the exact spherical shell but with varying thickness from the apex starting with 200mm thick at the top and to the base where the thickness is 700mm

@hnrwagner

3 жыл бұрын

The shell has a radius of 90 mm :) do you really mean 200 mm shell thickness ? otherwise, in the case of a varying thickness, the most sensitive part will be the apex with the minimum thickness and it will buckle there first. I will make a video about it, because i think its very interesting and i have never done it. Thanks.

@hnrwagner

3 жыл бұрын

the video for it will release 12.02.2021

@hnrwagner

3 жыл бұрын

here it is: kzread.info/dash/bejne/Y6p4k7qwe8a-lM4.html

@malefetsaneletsika9779

3 жыл бұрын

@@hnrwagner my deepest apologies i have internet issues at home and im only seeing your messages, these are the details for my spherical dome: * Plan Diameter: D = 60m * Rise of dome: = 8.04m * Radius of spherical shell: = 60m *Minimum shell thickness (at crest) = 200mm * Radius-to-thickness ratio (at crest) = 300 * Support angle = 30 degrees The loading is hydrostatic pressure because im trying to analyse the buckling loads using eigen-solutions for the dome supporting water above and therefore the pressure at the apex of the dome is 0kpa and at the base of the dome is 10kpa.

@malefetsaneletsika9779

3 жыл бұрын

@@hnrwagner thank you i will go over it

Dr. Wagner, why for GNA model error between the analytical solution and the numerical is almost 20%? But the LBA model works really good. Can we explain it from the theory?

@hnrwagner

Жыл бұрын

Nonlinear geometry reduces buckling pressure by 20 % for this particular shell configuration