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Yield stress vs critical load stress

  1. Nov 28, 2016 #1
    1. The problem statement, all variables and given/known data
    In Euler's theory , it's stated that the critical stress of beam is always larger than the yield stress of beam ...I dont really undertstand the differnce between them . Critical stress is defined as the stress that the mximum stress applied before the beam starts to buckle....

    2. Relevant equations


    3. The attempt at a solution
    Does the yield stress here means the stress which the beam start to deform plastically ?
    Why shouldnt 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
     
    Last edited: Nov 28, 2016
  2. jcsd
  3. Dec 1, 2016 #2

    PhanthomJay

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    Who told you that?
     
  4. Dec 3, 2016 #3
    it's based on my understanding , correct me if I'm wrong
     
  5. Dec 3, 2016 #4

    PhanthomJay

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    Euler buckling applies to long columns where the critical buckling stress is less than the yield stress.
     
  6. Dec 3, 2016 #5
    Do you mean for long column , the critical buckling stress is always less than the yield stress???
     
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