Consider a bar of uniform cross-section, subjected to equal and opposite tensile forces at its ends. A plane section is shown in the diagram by dotted line. Normal of this section makes an angle $θ$ with the axis of bar. With change in $θ$ , orientation of this plane changes.

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CT48 diagram

TestHub · Accepted Answer

Normal stress on a plane is σcos²θ and shear stress is σsinθcosθ. Hence normal stress is maximum at 0° and shear at 45°.

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