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Question

At a certain point in a strained material, there are two mutually perpendicular stresses σx=100N/mm2 (tensile) and σy=500 N/mm2 (compressive).
[Notation : tension (+); compression (-)]
What are the values of the principal stresses in N/mm2 at the point?

A
100, -50
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B
-100, 50
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C
75, -25
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D
-75, 25
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Solution

The correct option is A 100, -50
The given stresses are principal stresses as they are given on two mutually perpendicular planes and associated shear stress on these planes is zero.

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