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    According to which theory of failure does the ductile material begin to yield, when the maximum principal strain reaches the strain?
    Question

    According to which theory of failure does the ductile material begin to yield, when the maximum principal strain reaches the strain?

    A.

    Rankine's theory

    B.

    Haigh's theory

    C.

    St. Venant's theory

    D.

    Guest theory

    Correct option is C


    Theory of Failure
    Description
    Maximum Principle Stress/ Rankine’s /Lame’s Theory
    It states that for no failure maximum principle stress should always less than the yield stress under uniaxial loading.
    Maximum Principle Strain/ St. Vennant’s Theory)
     It states that for no failure maximum principle strain should always less than the yield strain under uniaxial loading.
    Maximum Shear Stress/ Tresca’s /JJ Guest theory
    It states that for no failure absolute maximum shear stress should always less than the maximum shear stress under uniaxial loading.
    Maximum Shear Strain Energy/Missess-Henky Theory
    It states that for no failure distortion of maximum shear strain energy per unit volume should always less than shear strain energy per unit volume under uniaxial loading.
    Maximum Strain Energy Theory/ Betrami Haigh theory
    It states that for no failure strain energy per unit volume should always less than strain energy per unit volume under uniaxial loading.

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