non linear buckling analysis " boundary condition problem"
non linear buckling analysis " boundary condition problem"
(OP)
hello everyone,
Currently, I am working on Plain channel section having dimensions 180 mm length, 60 mm web x 30 mm flange and 1.1 mm thickness. I have generated codes for axis symmetrical section for analysis but whenever I am running those codes, ANSYS gives me warning message (Non-linear buckling analysis) "Both solid model and finite element model boundary conditions have been applied to this model. As solid loads are transferred to the nodes or elements, they can overwrite directly applied loads". After few minutes solution gets converged. But results obtained are different from my theoretically calculated results. results differ by 50% in ANSYS and calculated.
it would be great if any on help me out...
thanks a lot
aniket
Currently, I am working on Plain channel section having dimensions 180 mm length, 60 mm web x 30 mm flange and 1.1 mm thickness. I have generated codes for axis symmetrical section for analysis but whenever I am running those codes, ANSYS gives me warning message (Non-linear buckling analysis) "Both solid model and finite element model boundary conditions have been applied to this model. As solid loads are transferred to the nodes or elements, they can overwrite directly applied loads". After few minutes solution gets converged. But results obtained are different from my theoretically calculated results. results differ by 50% in ANSYS and calculated.
it would be great if any on help me out...
thanks a lot
aniket





RE: non linear buckling analysis " boundary condition problem"
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RE: non linear buckling analysis " boundary condition problem"
Do you mean you are using a quarter-section model for the analysis, and applying symmetry boundary conditions across the "cut" faces? If so, then you are artificially constraining the mode shapes available, since no deformation is allowed on the lines of symmetry, and thus artifically constraining the part to higher order buckling modes.
RE: non linear buckling analysis " boundary condition problem"
but still i am struggling with same problem.
RE: non linear buckling analysis " boundary condition problem"
Brian
www.espcomposites.com
RE: non linear buckling analysis " boundary condition problem"
RE: non linear buckling analysis " boundary condition problem"
Chris
www.value-design-consulting.co.uk
RE: non linear buckling analysis " boundary condition problem"
but still i am struggling with same problem. "
Umm, maybe we have answered the wrong question. Can you post a sketch or jpg of your model, with boundary conditions (including lines/planes of symmetry if they exist) noted?