# Questions tagged [buckling]

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### I can't understand what why they don't put Reaction momentum of torsional spring in FBD of whole system at B in instability analysis of column

this example is from Finite element procedures Book by Klaus-Jürgen Bathe pg 93 example 3.11 can somebody explain me why they don't consider reaction moment of torsional spring in whole system FBD but ...
44 views

### Buckling length of continuous steel H columns in multi story buildings

I have seen that steel columns in multiple story buildings span multiple stories, in that case how do you calculate the buckling length for the column? do you take the whole column's height, or just ...
60 views

### Minimal width of a carbon fiber shell to hold a flying airship

In Aves Æternæ: Building Perpetual Flying Machines you can find the specs for an airship with a rigid carbon fiber shell. It would be around 4m long and 2m wide and high, weigh around 10 kg empty (0 ...
208 views

### Hollow circular columns vs solid circular columns of exactly the same mass and length, which resist buckling better?

I've seen a number of mentions in the tensegrity literature asserting (without proof or reference) that, in the context of a tensegrity rod under pure axial compression, hollow columns perform better ...
52 views

### Is there a way to program a buckling analysis of an arbitrary shape, using a standard programming language/libraries (not Abaqus)?

I am trying to develop a program in Python that runs a few different basic analyses for optimization like minimizing compliance and buckling. I want to use machine learning to try to develop a fast (...
38 views

### Can a buckling steel column fracture on multiple points?

When a column buckles, then yields, and finally fractures fractures, along the most stressed point, this will initially reduce the axial and bending strains along other points. The apparent conclusion ...
146 views

### Determining the critical load of a fixed beam with non-uniform cross-section?

I am a computer scientist, not a mechanical engineer, so it is absolutely possible that I am missing some basic understanding here. I have a beam that is fixed in both ends and my goal is to ...
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### How to calculate maximum buckling load for hydrofoil strut?

I am a hobbyist and in the process of designing a human-powered hydrofoil (see Hydroped for reference) I'm kind of stuck in the calculation of the the maximum buckling load for a strut. The strut is ...
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1 vote
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### Describing 180 degree arcing/deflection of wire supported vertically at one end

I am trying to understand how to describe and calculate the shape a length of piano wire makes from its own weight when supported vertically at only one end. Is it a catenary or a parabola? ...
57 views

### What is the critical buckling force needed to be applied on a system of made out of two parts?

What is the critical buckling force needed to be applied on a system of made out of two parts? The parts of the system are as depicted in the picture: incompressible elastic beam - on top ...
132 views

### How to find the tension in wires before a column buckles

I already have the solution for this problem, I just need some explanation about a certain part. Can someone please explain the highlighted section, how do I obtain the tension formula used here?
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### Why isn't lateral torsional buckling of rectangular timber members dependent on torsional stiffness?

I'm reading about buckling of timber members from Eurocode 5: Design of timber structures part 1. Section 6.3.3 gives instructions to check the stability of beams subject to compression, bending or ...
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1 vote
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### How do I calculate how many newtons a hollow rod can carry without buckling?

how can I calculate how many newtons a 600[mm] long rod with a known yield strength (300 [MPa]), young modulus (190 [GPa]) and hollow (outer diameter = 16[mm], inner diameter = 10[mm]) will carry ...
533 views

### Beam buckling criterion?

If I have an I beam which I subject to some bending load, how can I calculate when the thinner middle part of the I beam will buckle? I though I could use Euler's critical load formula here, but it's ...
37 views

### How do FE solvers solve the case of panel buckling under pure shear?

How do FE solvers solve the case of panel buckling under pure shear? The main problem is that global matrix of initial stess is singular in that case. One method is to apply some forces that shear is ...
125 views

### Using modes from linear buckling analysis as imperfections

I'm reading this article on buckling. It first introduces us to linear buckling analysis, and then mentions that linear analysis can be unrealistic as it doesn't take imperfections into account. Then ...
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### Why is local yielding considered the limiting case in context of buckling in Eurocode?

In Eurocode, when use buckling curves to calculate the maximum load that a compressive member can be subjected to before it risks buckling. Buckling curves are based on the Perry-Robertson formula. I'...
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### Why is buckling said to be independent of material strength?

In many sources, such as here, it is said that buckling failure is independent of the material's strength. But in many building codes, yield stress of the material is a factor that changes the ...
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2k views

### Definition of buckling as a sudden deformation

On Wikipedia, buckling is defined as follows: In engineering, buckling is the sudden change in shape of a structural component under load such as the bowing of a column under compression or the ...
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56 views

### Can the critical buckling load from non-linear FE calculation be higher than the one from linear?

Let's consider a FE buckling calculation without plasticity. Is there theoretically any chance that the non-linear analysis will give a higher buckling load than the linear one?
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I have a very long beam which is subjected to a torque (I have the moments and shear forces with respect to X along the beam). I can calculate the critical load when the beam would bend if it was ...
1 vote
362 views

### For arc-length method in nastran, how to analyse post-buckling behaviour with load decrease

I am currently trying to model the buckling behaviour of a cylinder using sol 400 nonlinear static analysis using Nastran. I am using the arc-length (modified Riks) method as apparently it can ...
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1 vote
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### How would I do a buckling analysis with an additional fixed known lateral force?

I am using Nastran for buckling analysis, and I'm new to all of this so please bear with me. For a linear buckling analysis, I understand that you must first apply any compressive load in the static ...
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### Why is buckling caused by nonlinear geometry?

I've been reading the Comsol post on geometric nonlinearity. The article introduces situations where the small angle approximation and linear analysis of structures gives inaccurate results. For ...
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107 views

### What is meant by "perfect geometry" in the context of Euler buckling?

In this question for example (in the first answer) it is said that the Euler critical load formula is unrealistic, because it assumes perfect geometry and perfect alignment of the load. I've found ...
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