Circular beam - average shear stress = 0.75 maximum shear stress.

Q.  The average shear stress in a beam of circular section is _______ times the maximum shear stress.
- Published on 21 Sep 15

a. 0.75
b. 1.5
c. 4/3
d. equal

ANSWER: 0.75

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    Discussion

  • Sravanthi   -Posted on 24 Nov 15
    - Maximum shear stress over a circular section is given as

    τ = (4/3) (S/A)

    here, S is the shear force and A is the area of circle

    But S/A is the average shear stress, therefore τ = (4/3) τavg

    τavg = (3/4) τ

    τavg = 0.75 τ

    Hence, the average shear stress in a beam of circular section is 0.75 times the maximum shear stress.

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