Which stress is induced in screw body?

Q.  Which type of stress is induced in a screw body?
- Published on 14 Sep 15

a. Bearing pressure
b. Direct shear stress
c. Torsional shear stress
d. None of the above

ANSWER: Torsional shear stress


  • Sravanthi   -Posted on 04 Nov 15
    Different stresses induced in a screw body are:

    1) Direct compressive or tensile stress: This stress is induced due to axial force.
    It is given as σ = W / (π /4) d2

    2) Torsional shear stress: This stress is induced due to twisting moment or torque.
    It is calculated using the formula: τ = 16 T / πd3

    3) Buckling of screw: Buckling failure is checked when axial load on screw is compressive and the unsupported length of screw is long.

    Different stresses induced in screw threads are:

    1) Bearing pressure: This pressure exists between screw and nut, which have relative motion between them. The formula to calculate bearing pressure is: P = W / (π/4 [d12 – d22] Z)

    2) Direct shear stress in screw and nut threads: This stress is induced in screw threads at core diameter and in nut threads at nominal diameter due to axial load acting on them. The formula to calculate direct shear stress is:
    τ = W/ (π d t Z)

Post your comment / Share knowledge

Enter the code shown above:
(Note: If you cannot read the numbers in the above image, reload the page to generate a new one.)