ABAQUS Tutorial: BUCKLING OF NASA‘s LARGE SCALE SANDWICH COMPOSITE CYLINDER

[@hnrwagner]

What kind of shell buckling analysis do you want to see next ? comment below !

[@liboyan4897]

Finite elastoplasticity shell (isotropic / orthotropic)!

[@kitty861987]

Can you consider the effects of the stiffened cylinders on their strength? It í very interesting.

[@hnrwagner]

@@kitty861987 I do not understand the question ? could you rephrase it and give an example.

[@kitty861987]

@@hnrwagner I mean can you perform the numerical analysis of ring- and/or stringer-stiffened cylinder under combined loading? For example tension leg platform structures.

[@gopika219]

Sir, is modelling of ETTA1similar to this

[@onurbilgen214]

Hello sir. Could you show how to do nonlinear analysis with material imperfection for a flat plate composite shell? I changed the elastic modulus of the material for a small region and tried to get result in Abaqus. But, Abaqus cannot solve nonlinearly.

[@drury2d8]

Excellent videos, Doc

[@abijithkp574]

Hi Doc., I’m doing nonlinear buckling for the same sandwich cylinder problem. The material data i received are as follows: Compressive modulus - 402MPa Modulus (L-Direction) - 220MPa Modulus (W-Direction) - 103MPa Density - 36.8 kg/m3 How can we create a sandwich material using the above data?? Do we need to assume the rest of engineering constants? Or is there any calculations? Please help!!

[@hnrwagner]

I added Timecodes for better Overview: Timecodes: 0:00 - Intro 1:15 - Create Part 2:02 - Create Partitions 4:19 - Assembly and mirror part 4:56 - Define Material Data for CFRP 5:30 - Define Material Data for Sandwich 6:30 - Define Orientation and Coordinate System 7:00 - Define Laminate Stacking 12:17 - Define Analysis Step (Linear Buckle) 12:41 - Define Rigid Body Constraints and Reference Points 13:33 - Define Boundary Conditions and Loading 14:01 - Define Mesh 14:30 - Prepare Nonlinear Model 14:40 - Define Analysis Step (Nonlinear Static General) 15:05 - Modify Boundary Conditions 16:40 - Results of Linear Analysis 17:14 - Results of Non-Linear Analysis 19:00 - Export Load-displacement Curve to MS Excel 20:11 - Comparison of Test and Simulation 20:40 - Calculate Knockdown Factor 21:20 - Experimental Test Video

[@waqashafizmuhammad5756]

thank you so much. can you please give me your what's app number? or email? I want to discuss something with you. I sent you email on the address given in the video. but it was bounced back

[@hnrwagner]

@@waqashafizmuhammad5756 Email given in the video has a spelling error: [e-mail]

[@waqashafizmuhammad5756]

@@hnrwagner please check your email

[@waqashafizmuhammad5756]

Hi. if we want to add imperfections on which step on the timecode we can insert that. if possible please make a video on that too. and also in BC and loading section I haven't seen where you put the loading force.

[@hnrwagner]

@@waqashafizmuhammad5756 Loading for linear Analysis at 13:50 Loading for nonlinear Analysis at 16:10 I make a new video soon with imperfections.

[@mehulardeshana]

Dear sir, how can we get thickness distribution in metal forming in abaqus

[@hnrwagner]

Can you give a reference? Dont know what you mean

[@zhiminghe6310]

Sir, where can I get the data of axial force to axial displacement of experimental? I want to practice making graphs use excel just like the video. Your serials of abaqus tutorial are very helpful. Thank you very much .

[@hnrwagner]

ntrs.nasa.gov/api/citations/20180002092/downloads/20180002092.pdf

[@zhiminghe6310]

@@hnrwagner In this report，the predicted buckling loads and measured buckling loads agreed within 1%, so why NASA concerned about the knockdown factors?

[@hnrwagner]

@@zhiminghe6310 ​ @Zhiming He a KDF is always required for certification plus an additional safety factor. The official KDF for this shell would be 0.60 according to the NASA SP-8007. The KDF with respect to the exp. test is 0.87. The KDF according to new design methods would be for this shell 0.68.

[@waqashafizmuhammad5756]

what happened to you? why are you so fast. please repeat the steps slowly. very difficult to follow you

[@hnrwagner]

just watched the entire video and added timecodes for better overview. What is too fast for you? I think it is appropriate, it is not for beginners for sure.