A cylindrical rod has equal and opposite forces applied perpendicular to its circular ends. The forces are directed toward the rod, compressing the rod. What type of stress is this rod subject to?
the rod is subjected to tensile stress. In such cases, the volume of the rod remains constant, however there's an increment in the length.
Tensile stress makes material elongate along the axis of the applied load.
In this case, the rod elongates along its axis yet the volume remains constant.