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Question

The details of the principal stresses at a certain point in a steel member are as follows :
Major principal stress σ1=180 N/mm2 (Tensile)
Minor principal stress σ2 is Compressive.
If the uniaxial tensile yield stress is 240 N/mm2, according to maximum shear stress theory, what would be the value of σ2 in N/mm2 at which yielding will commence?

A
120 tension
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B
90 tension
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C
80 compression
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D
60 compression
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Solution

The correct option is D 60 compression
As per maximum shear stress theory

σ1σ22=σy2

σ1σ2=σy

180(σ2)=240

σ2=240180

σ2=60N/mm2


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