Dear sir, thank you so much for a very comprehensive video, I was wondering which statement in DNV-RP-C208 implied that the capacity is "200 ish" kN, as you mentioned at 37:50 mins. of the video.
@@endeavosThe ~210 kN is not the 'allowable limit' based on the non-linear buckling. The 210 kN is the unfactored capacity from the previous example which was based on LBA and empirical buckling curves. The design capacity from NLA is the max value on the chart divided by all relevant safety factors (load and resistance) based on whatever code you are working to.
Hi Benjamin. The scale factor is based on the manufacturing tolerance and as structural designer, it is basically your choice. If you want to be conservative, you can use the max tolerance. In this video, I followed the DNV's recommendation. Please see the document DNV-RP-C208. Thanks!
@@endeavos Thanks for the information! Can I also know which section did you get the value from? And another question I would like to ask is: In my project, I need to apply both hydrostatic and constant pressure onto a corrugated wall. When I get my eigenvalue, do I multiply the eigenvalue to both pressure or just the constant pressure? Thanks in advance!
Temperature can impact young's modulus if you have defined it as function of temperature. Buckling can happen at any temperature. There is no set "buckling temperature". If you want to find how buckling load varies with increasing temperature, you may have to run this simulation at different temperatures by inserting temperature as a load. You can use the temperature as a parameter and run this simulation at different temperatures to determine buckling load as a function of temperature.
@@endeavos sorry, i get it now, i want to change my question, what is the different between force based and displacement based analysis, and why both of analysis we get the similar result? Another question, why i cannot get the graph like you did? I m getting straight line. 😣
@@nuraisyahsamsul2831 In the force based analysis, we apply a force to initiate buckling which results in displacement whereas in the displacement based analysis, we apply displacement to initiate buckling. Both methods will give you the same buckling load, however, force based methods run into convergence problems. Displacement based loading is preferred because it will also show you post buckled behavior of the structure.
The way you have presented multiple buckling types in one single video is awesome. Hats off.
Glad you liked it!
Thats for sure the best NLBA on youtube.
Congratz!
Really nice video! Thank you!
Glad you liked it!
thank you so much for sharing your knowledge, it was a great video, I really enjoyed it.
Wonderful Endeavos! Thats what i needed to finish my analysis of a wing spar👏🏾👌🏾
Perfect!
How did you create the chart? 18:39
Amazing video! Thank you very much! You have helped me to solve a design problem in my work ❤
Glad it helped!. You are welcome
Thank you Endeavos Innovations. A great presentation.
Thanks!
Thank you very much for this clear explanation!
Could you be so kind as to share the link with models' geometry?
Very helpful video
16:16 I think the scale factor is not 15 mm, rather is 15 times the deformation of the linearized eigenmode shape. Please correct me if im wrong here.
The linear buckling load is normalized to unit deformation. So I can use scale factor = deformation.
Dear sir, thanks for a brilliant video. I'm wondering if it can couple two buckling mode shapes?
In some cases two buckling loads can happen successively as the buckling load is increased. Is that what you mean?
Great video! Thanks!
Glad you liked it!
@@endeavosThank you very much for this clear explanation!
Could you be so kind as to share the link with models' geometry or the final ansys file ?
Awesome sauce
Dear sir, thank you so much for a very comprehensive video, I was wondering which statement in DNV-RP-C208 implied that the capacity is "200 ish" kN, as you mentioned at 37:50 mins. of the video.
Thanks for watching. The ~200+ KN is the estimated capacity based on DNV's chart. it is marked right there on Fig B-17.
@@endeavosThe ~210 kN is not the 'allowable limit' based on the non-linear buckling. The 210 kN is the unfactored capacity from the previous example which was based on LBA and empirical buckling curves. The design capacity from NLA is the max value on the chart divided by all relevant safety factors (load and resistance) based on whatever code you are working to.
Are there any specific guidelines on defining the number of steps/substeps (initial, minimum, and maximum), plus Step End Time?
My apologies for the late response. It really depends on the nonlinearity of the model.
Hi, I am confused how you came up with the scale factor at 16:16, and does this work on all geometry like corrugated walls?
Hi Benjamin. The scale factor is based on the manufacturing tolerance and as structural designer, it is basically your choice. If you want to be conservative, you can use the max tolerance. In this video, I followed the DNV's recommendation. Please see the document DNV-RP-C208. Thanks!
@@endeavos Thanks for the information! Can I also know which section did you get the value from? And another question I would like to ask is: In my project, I need to apply both hydrostatic and constant pressure onto a corrugated wall. When I get my eigenvalue, do I multiply the eigenvalue to both pressure or just the constant pressure? Thanks in advance!
Hi, please can you explain to me the reason of 10 millimeters of displacement in the first example ( rod ) ? Thanks in advance
How do i scale it i didn't understood and i am getting the normal deformation not at center but at top how shall i change it
nice explanation
Thanks and welcome
For Non linear thermal buckling , how to find the critical buckling temperature
Temperature can impact young's modulus if you have defined it as function of temperature. Buckling can happen at any temperature. There is no set "buckling temperature". If you want to find how buckling load varies with increasing temperature, you may have to run this simulation at different temperatures by inserting temperature as a load. You can use the temperature as a parameter and run this simulation at different temperatures to determine buckling load as a function of temperature.
@@endeavos i assumed temperature is constant, only temperature varies across the thickness.
Go on, please!
The results I calculated are very different from those in your video. I hope to find the issue from your model.
Hey, I happened to have a very different results as well. Would you mind sharing what you have done?
why i cannot change the material properties from linear to non linear?
I didn't get your question. Can you elaborate it?
@@endeavos sorry, i get it now, i want to change my question, what is the different between force based and displacement based analysis, and why both of analysis we get the similar result?
Another question, why i cannot get the graph like you did? I m getting straight line. 😣
@@nuraisyahsamsul2831 In the force based analysis, we apply a force to initiate buckling which results in displacement whereas in the displacement based analysis, we apply displacement to initiate buckling. Both methods will give you the same buckling load, however, force based methods run into convergence problems. Displacement based loading is preferred because it will also show you post buckled behavior of the structure.
@@nuraisyahsamsul2831 Regarding the second question, can you tell me what example or problem you are referring to?
I m research scholar and I need your help in my research work
Hi, can i have your email, i want to ask about my problem regarding my project
Sure, its zaeem@endeavos.com