Define Compound Stress.
Sol.: Simple stresses mean tensile stress or compressive stress or shear stress. The tensile and compressive stresses act on plane normal to the line of action of these stresses, and shear stress acts on plane parallel to line of action of this stress. But when plane in a strained body is oblique to applied external force, this plane can be subjected to tensile or compressive stress and shear stress. That is
This type of system or plane in which direct or normal stresses and shear stresses act at the same time are called as compound stress or complex stress.