The stress concentration factor is defined as the ratio of-

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BDL MT Mechanical 16 April 2022 Official Paper
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  1. Maximum stress to the nominal stress
  2. Nominal stress to the maximum stress
  3. Nominal stress to the endurance limit
  4. Maximum stress to the endurance limit

Answer (Detailed Solution Below)

Option 1 : Maximum stress to the nominal stress
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ST 1: BDL MT Thermodynamics
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Stress concentration factor (K) is defined as the ratio of the maximum stress in a member at discontinuity to the nominal or average stress at the same section based upon net area.

K or Kt = σmax0 = τmax0   where, σ0 and τ0 are nominal stress and σmax and τmax are localized stresses at discontinuity.  

Mathematically Kt = 1 + 2.a/b  

GATE ME Part TEST 3  Images Q1

Stress concentration factor K is used for consideration of stress concentration and to find out the localized stress at the discontinuity.

The value of Kt depends upon the material and geometry of the part.

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