Question 26.3.49: The principal stresses σ1, σ2 and σ3 at a point respectively...

A Textbook Of Strength Of Materials: Mechanics of Solids

The principal stresses $σ_1, σ_2$ and $σ_3$ at a point respectively are 80 MPa, 30 MPa and – 40 MPa. The maximum shear stress is
(a) 25 MPa (b) 35 MPa (c) 55 MPa (d) 60 MPa.

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