Complex structures consisting of intertwined, nominally vertical carbon nanotubes (CNTs) are called turfs. Under uniform compression experiments, CNT turfs exhibit irreversible collective buckling of a layer preceded by reorientation of CNT segments. Experimentally observed independence of the buckling stress and the buckling wavelength on the turf width suggests the existence of an intrinsic material length.
I am performing a nonlinear post buckling using Riks method. I went through different tutorials for the same. I happen to see that an *IMPERFECTION is introduced while performing the non linear buckling analysis.Why is it done? How does/will the model react differently if the Imperfection is no introduced?
I wish to plot the graph of load v/s displacement for 1,2,3,4...10 times the critical buckling load during the post buckling analysis (Riks method). How do I do that?
Xu, F., Potier-Ferry, M., Belouettar, S., Cong, Y.,
International Journal of Solids and Structures (2014), doi: http://dx.doi.org/10.1016/j.ijsolstr.2014.06.023
Abstract:
hi everyone,
i am doing my dissertation on buckling of channel section. so i have used abaqus software to do the analysis. i did the modelling and applided unit load n given pinned-pinned end condition. and i have used constraints to both ends such that the load applied on the edge is concentrated at a point .
but the results i.e mode shapes are not coming properly even the eigen values are very less compaired to calculated buckling load.
plz help me out.
dimensions of specimen channel section
width of web 100mm
width of flange 50mm
F. Xu, H. Hu, M. Potier-Ferry, S. Belouettar
International Journal of Solids and Structures (2014), doi: http://dx.doi.org/10.1016/j.ijsolstr.2014.05.011
Abstract:
Hello,
I have a problem with a stacked colum of elastomeric membranes (natural rubber or silicone).
I am looking for a compression buckling criterion that applies for hyperelastic materials in presence of large deformations (up to 400%).
I've read about Haringx formula, that should apply for these materials, but I suspect that it is valid for small strains only.
My question is:
- is there a suitable buckling criterion for this case?
HI,
I'm trying to simlate the buckling behavior of a grpahene sheet using ANSYS APDL 14.5
In my analysis I need to have a graphene sheet that is curved with a variable radius for different cases. I was wondering if there is a faster way to model the graphene sheet assuming that the carbon-carbon bonds are modelled as elastic beam elements( beam 188) and the nodes are represnted by the carbon atoms.
--Naveen R--
Hello every one.
I'm doing work on buckling analysis using abaqus. I want to continue my work on postbuckling of plates also. I'm not getting any tutorials on how to perform Postbuckling analysis of plates using abaqus. When i searched the abaqus help documentation, i got .inp file of a plate, but i didnt get the steps on how to perform the analysis.
I read in some books that after buckling of a plate, it still can take the load. How to do this in abaqus interface ?how to perform the postbuckling analysis in a proper way ?
Plz help
Hello everyone,
I want to reproduce global buckling of a 3D column (simply supported) using shell elements independently of its length.
I know that each section of the column should behave like a rigid body but I can't do it, so by doing the buckling analysis I get other buckling modes (like local buckling).
My initial idea was to use rigid body (tie) constraint in some sections (uniformly spaced) but what I got was some local buckling in the extremities of the column.
Does anyone know how to modify Bathe's subspace iteration eigensolver to compute the highest eigenvalue instead of the smallest ?
