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Nonlinear Buckling of Cylindrical Tubes w/ ANSYS

Submitted by canavarr on
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Computational Mechanics Forum
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buckling
ansys

Hi all,

I'm trying to run a nonlinear (elastic for now) buckling analysis in ANSYS. Basically I have a thin cylindrical shell (made up of SHELL181). fixed at one end (rigid) and applied force and/or displacement specified on the other end to make it buckle.

I have pretty much tried all options. These were:

i) Linear buckling (Eigenbuckling)

ii) Displacement controlled buckling with a lateral point force to provide eccentricity/imperfection.

iii)Force controlled buckling with, again, a lateral point force (arc-length method)

Buckling of Stepped column

Submitted by GOPALAERO2000 on
education
buckling
column
stepped column

Hi everyone,

Does anyone have the work experience on stepped column kind of structure?

I would like to know, how to determine the crippling load for stepped column kind of structures? If anyone have the materials pertaining to the subject, please do share (if interested).

 

Thanks and Regards

 

M Gopalakrishnan.

Derivation of the bending stiffness from REBO potential -- Contribution from the dihedral term

Submitted by QiangLu on
buckling
R. Huang Group Research
molecular mechanics
bending
Nonlinear elasticity
research
graphene

Thanks to Marino, I have found the reason for the difference in our bending stiffness calculation. The original discussion is here:
node/4029

Mechanics of buckled carbon nanotubes on elastomeric substrates

Submitted by Jianliang Xiao on
research
Carbon nanotube
buckling
elastomeric substrate

We have studied the scaling of controlled nonlinear buckling processes in materials with dimensions in the molecular range (i.e., ～1 nm) through experimental and theoretical studies of buckling in individual single-wall carbon nanotubes on substrates of poly(dimethylsiloxane). The results show not only the ability to create and manipulate patterns of buckling at these molecular scales, but also, that analytical continuum mechanics theory can explain, quantitatively, all measurable aspects of this system.

Post-buckling and Snap-through Behavior of Inclined Slender Beams

Submitted by J Zhao on
research
buckling

In MEMS fields, a need arises in engineering practice to predict accurately the nonlinear response of slender post-buckling beams, especially the nonlinear transverse stiffness. The bistability of the post-buckling beams is excellent in reducing power consumption of micro-devices or micro-systems. However, the major difficulty in analyzing the post-buckling and snap-through response is the intractability of the geometric nonlinear control equations of large deflection beams.

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