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Mechanics of Materials
Normal Stress

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NORMAL STRESS is the intensity of the net forces acting normal (perpendicular) to an infinitely small area dA within an object per unit area. If the normal stress acting on dA pulls on it, then it is referred to as tensile stress, whereas if it pushes on the area, it is called compressive stress. An average normal stress at any point on the cross sectional area can be calculated as follows:

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Normal Stress