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A shaft is subjected to a bending moment of 30 Nmm and a twisting moment of 40 Nmm. The equivalent twisting moment on this shaft is

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  1. 140 Nmm
  2. 50 Nmm
  3. 10 Nmm
  4. 70 Nmm

Answer (Detailed Solution Below)

Option 2 : 50 Nmm
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Detailed Solution

Download Solution PDF

Concept:

Equivalent Twisting TM:

It is the twisting moment Teq that alone produces maximum shear stress equal to the maximum shear stress produce due to combined bending and torsion.

Let Teq be equivalent TM.

As per the definition of Teq τ = τmax

Calculation:

Given:

M = 30 Nmm, T = 40 Nmm

Equivalent Twisting TM:

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