Questions tagged [buckling]
70 questions
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Buckling: Do buckling mode shapes of n > 1 occur in reality?
In the buckling of columns we know that:
$$P = \dfrac{n^2\pi^2EI}{L^2}$$
The smallest value of P occurs when $n=1$ which gives a simple buckling shape (one wave):
$$P_{cr} = \dfrac{\pi^2EI}{L^2}$$
However for $n > 1$, as shown below the buckling…
pauloz1890
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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 wrinkling of a plate under shear. If a structure is…
S. Rotos
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Eccentricity for staggered 2x4 wall
I have a staggered 2x4 wall on a 2x6 sill plate as illustrated below (16" on center on each side = 8" on center each stud). The wall is loaded from both sides by floor joists, so I would consider it to be loaded in the center of the axis of the…
user2817017
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Do yielded columns buckle?
A sufficiently slender column will fail under compression below yield stress by bowing, releasing it's axial elastic strain. This is called buckling. Depending on the slenderness of the column, the buckling may be fully elastic, or may involve some…
4
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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 unclear to me how exactly I calculate the…
Beacon of Wierd
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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'm reading a derivation of the formula here.
The…
S. Rotos
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How thick does an aluminium vacuum cylinder have to be?
Take a hollow aluminium cylinder with outer radius $r$ and length $h$, capped with two circular endcaps. How thick does the aluminium have to be, that is what is the inner diameter of the cylinder, to withstand 1 atm on the outside and 0 mbar on…
user1717828
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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 not so pure. But I think there should be some…
Евгений Павлов
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Column Buckling Boundary Conditions -- Welded Tubing Practical Application?
I'm trying to do some calculations for a personal project. I'm trying to understand column strength / buckling. My questions relate to Effective Length Constant, which is based on Boundary Conditions (how the ends of the column are restrained) The…
zipzit
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How to compute core stress in honeycomb structure?
Assume I have a honecomb(sandwich) panel under distributed normal load. Each edge of this panel is simply supported(pinned) as on the picture below:
The problem is how to find the core stresses σ-z (not on sides of the panel) as on the picture…
Eugene
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Methods to Measure Buckling without Expensive Equipment
I'm working with some flexures (circularly symmetric tube with pins at the ends). Their bending stiffness matches my FEA. However, I'm concerned that they are buckling, reducing their overall axial stiffness.
I don't have a way to measure the…
user3533030
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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 without buckling?
Thanks.
Edit: My main question is…
AnatolianCat
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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 it is said:
One good strategy is to first…
S. Rotos
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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 allowed buckling load. The Perry-Robertson formula for…
S. Rotos
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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?
G.David
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