Drilling axial hole - Uniform strength

Q.  Drilling axial hole is a method used to achieve ______
- Published on 14 Sep 15

a. uniform strength
b. uniform stress
c. uniform toughness
d. all of the above

ANSWER: uniform strength

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    Discussion

  • rudransh tripathi   -Posted on 06 Jan 19
    hi,
    the formula of dia of drilled hole = v(Diameter of bolt)2 + (core diameter of bolt)2
    is wrong. it should be like this: The diameter of drilled hole = v{(Diameter of bolt)2 - (core diameter of bolt)2}
  • Sravanthi   -Posted on 04 Nov 15
    - Fracture of bolt occurs due to uneven distribution of impact energy. The cross-sectional area in threaded portion is minimum and the stress in this portion of bolt is higher than shank.

    - The two methods used to achieve bolts of uniform strength are:

    1) Reducing shank diameter: If shank diameter becomes equal to core diameter, the stress throughout the bolt is same. Hence uniform strength is distributed throughout the bolt. This makes the bolt lighter and stronger and is called as bolt of uniform strength.

    2) Drilling axial hole: An axial hole is drilled in this method instead of reducing the shank diameter. The cross-sectional area of shank and the core area of threaded portion become equal.

    - The diameter of drilled hole = √(Diameter of bolt)2 + (core diameter of bolt)2

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