Yield stress vs critical load stress

[fonseh]

Homework Statement

In Euler's theory , it's stated that the critical stress of beam is always larger than the yield stress of beam ...I don't really undertstand the differnce between them . Critical stress is defined as the stress that the mximum stress applied before the beam starts to buckle...

Homework Equations

The Attempt at a Solution

Does the yield stress here means the stress which the beam start to deform plastically ?
Why shouldn't the yield stress is smaller than the critical stress ?

When object is subjected to stress , the beam will deform plastically before it starts to bend and break ... So , i think that yield stress is smaller than the critical stress [/B]

 

[PhanthomJay]

Homework Statement

In Euler's theory , it's stated that the critical stress of beam is always larger than the yield stress of beam ...ISo , i think that yield stress is smaller than the critical stress

Who told you that?

 

[fonseh]

Who told you that?

it's based on my understanding , correct me if I'm wrong

 

[PhanthomJay]

Euler buckling applies to long columns where the critical buckling stress is less than the yield stress.

 

[fonseh]

Euler buckling applies to long columns where the critical buckling stress is less than the yield stress.

Do you mean for long column , the critical buckling stress is always less than the yield stress?