Distinguish between tensile stress and compressive stress
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Consider a rectangular bar subjected to an external force (F) in outward direction as shown in the figure. Such kind of force experienced by the rectangular bar is called tensile force. Now the ratio of force(F) applied exposed to the cross sectional area gives us the quantity of tensile stress.
When an object is applied with tensile force, the cross sectional area of the object reduces but the length of the object increases.
When we apply a compressive force to any object its cross sectional area increases but the length of the object decreases. This force is applied in inward direction.
Refer the given figures
Compressive stress is define as compressive force upon cross sectional area of the expose
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