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Permissible bending moment in a circular shaft under pure bending is M, according to maximum principal stress theory of failure. According to maximum shear theory of failure, the permissible bending moment in the shaft is
  • a)
    M/2
  • b)
    M
  • c)
  • d)
    2 M
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Permissible bending moment in a circular shaft under pure bending is M...
According to maximum principal stress theory, 
σ1 = σy
According to maximum shear stress theory,

Under pure bending, 
Therefore, in both the cases, permissible bending moment is M,
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Most Upvoted Answer
Permissible bending moment in a circular shaft under pure bending is M...
M/√2
d)2M
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Permissible bending moment in a circular shaft under pure bending is M, according to maximum principal stress theory of failure. According to maximum shear theory of failure, the permissible bending moment in the shaft isa)M/2b)Mc)d)2 MCorrect answer is option 'B'. Can you explain this answer?
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