Learning Forum

[Zoe69]

Hello !

I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. I have read that negative load multiplier significate that the reverse applied load would create buckling in the structure. Why do I have just negative load multiplier here ? Does it mean that my structure is well design for buckling ? 

I also noticed that modes change with the number of modes used in the analysis settings. Can someone explain me why ? 

 

Thank you a lot for your answers !

Zoë

[Wenlong]

Hello Zoë,

The following comment is from the Ansys documentation "Based upon how you apply loads to a structure, load factors can either be positive or negative. The application sorts load factors from the most negative values to the most positive values. The minimum buckling load factor may correspond to the smallest eigenvalue in absolute value."

You can find the detailed information here: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/wb_sim/ds_buckling_analysis_type.html?q=negative%20load%20factor

If you have trouble accessing the Ansys help, please refer to this post: /forum/forums/topic/how-to-access-the-ansys-online-help

Regards,

Wenlong

[Zoe69]

Thank you very much for your answer !

Regards 

Zoe

[Wenlong]

Hi Zoë,

If you think this answers your question, please click on "is solution" button so that we know the problem is solved. Thank you!

Regards,

Wenlong