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ISRO VSSC Technical Assistant Mechanical held on 07/04/2012

Option 1 : Ratio of maximum stress occurring near discontinuity to average stress at critical section.

**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 K _{t} = σ_{max}/σ_{0} = τ_{max}/τ_{0} ** where, σ

**Mathematically K _{t} = 1 + 2.a/b**

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

The value of K_{t} depends upon the material and geometry of the part.

ISRO VSSC Technical Assistant Mechanical held on 09/06/2019

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