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Question

Consider the following statements: 

1.On planes having maximum and minimum principal stresses, there will be no tangential stress.

2.Shear stresses on mutually perpendi-cular planes are numerically equal. 

3.Maximum shear stress is equal to half the sum of the maximum and minimum principal stresses. 

Which of these statements is/are correct? 

 

A.
Only 1
B.
1 and 2
C.
2 and 3
D.
1 and 3
Answer ( Option B)

1 and 2

Solution

1. On principal planes, shear stress is zero - Correct.

2. Shear stresses on mutually perpendicular planes are equal in magnitude - Correct.

3. Maximum shear stress is:

 

It is half the difference, not half the sum – Incorrect

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