When a member is subjected to a direct stress in one plane, then the normal stresses on an oblique plane are given by:

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JKSSB JE CE 2021 Official Paper Shift 3 (Held on 27 Oct 2021)
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  1. σ cos θ
  2. σ cos2θ
  3. cos2θ
  4. σ cos 2θ

Answer (Detailed Solution Below)

Option 2 : σ cos2θ
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Explanation:

Member subjected to direct stress in one plane:
F1 Vishamber Sng 18.5.21 Pallavi D2

When a member is subjected to direct stress (σ) in one plane, the normal and shear stress on an oblique plane at an angle ϕ to the direction perpendicular of the direction of force is:

Normal stress, σn = σcos2ϕ  

Tangential or shear stress, τ = \(\frac{σ}{2}\sin{2ϕ}\)

Where, σ = \(\frac{P}{A}\)

P is the normal force due to stress and A is the area of cross-section of the member.

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