GATE ME 2016 Set 1 — Question 48
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Machine Design → Static & Dynamic Loading → Theories of Failure
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Question
The principal stresses at a point inside a solid object are , and . The yield strength of the material is . The factor of safety calculated using Tresca (maximum shear stress) theory is and the factor of safety calculated using von Mises (maximum distortional energy) theory is . Which one of the following relations is TRUE?
Correct answer
(C) n_T = n_V
Solution
Given: , , , .Tresca Theory:
.
At yield, .Von Mises Theory:
.
At yield, .Therefore, .
.
At yield, .Von Mises Theory:
.
At yield, .Therefore, .
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