Buckling

[nabeel3]

Following is a Exam Question. What is the correct answer

Buckling of a Member depends on which of the following

a) Ductility
b) Geometry
c) Yield strength or(Point)
d) Tensile strength

 

[WARose]

Assuming we are talking about linear, elastic buckling.....I'd say (b). (Unless all of the above is an option.)

 

[centondollar]

In reality: all of them.

In idealized bifurcation buckling for columns and unstiffened plates (eigenvalue analysis, elastic behavior): span (length of a column or lengths of sides of a plate), Young´s modulus, cross-sectional geometry (second moment of area in weak axis for beams, plate thickness and Poisson's ratio for plates), and boundary conditions. These four aspects are immediately obvious by inspection of e.g., the basic Euler buckling cases, which you should find in your textbook.

 

[nabeel3]

The question was that a welder was asked to fabricate a structure to minimise buckling.

 

[SWComposites]

Um, aren't student postings not allowed. Why should we answer exam questions???

 

[PEinc]

nabeel3 does not appear to be a student. Been a member since 2006.

http://www.PeirceEngineering.com

 

[dik]

missed elasticity... one of the most important ones...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[nabeel3]

Dear SWComposites, There is no age limit for writing exams.

 

[centondollar]

Well, a welder is typically not qualified to perform structural analysis and design, nor does a welder typically decide the geometry or material properties, so the question should be rephrased.

The basic relations relevant for elastic buckling (the most "basic" type of buckling analysis) are found in your course textbook in the chapter on buckling of e.g., columns.

 

[nabeel3]

Dear centondollar
There is no course and text book. Exam was for engineer qualification .

 

[JStephen]

In the case of a welder, I'd say the question relates to buckling due to weld distortion, not due to exterior loads, so quite a bit different issue.
Geometry would be the major issue out of the four with all four having some effect.
And some major issues not listed such was weld sequence, size, etc.

 

[nabeel3]

Thanks Jstephan and WARose and entondollar