Strength of Materials - Mechanical Engineering (MCQ) questions and answers for Q. 11478

Q.  When a component is subjected to axial stress the normal stress σn is maximum, if cos θ is _______ . (σn=σxCos2θ)

1. maximum
2. minimum
3. always one
4. always zero
- Published on 21 Sep 15

a. 1 and 4
b. 1 and 3
c. 2 and 3
d. 2 and 4

ANSWER: 1 and 3

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    Discussion

  • Sravanthi   -Posted on 25 Nov 15



    - In the above diagram, on plane QS the stress acting is σx and the stress acting on plane QT is σx cos θ

    - The normal stress acting is given σn = σx cos2 θ

    - When cos θ is maximum, normal stress is maximum. Hence the maximum value of cos θ is always one.

    - When cos θ = 1, θ = 0

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