The unit can be both displayed as N/m2 or Pa, both of which represent pressure. The formula for calculating material stress:įor example, a force of 1 N applied on a cross-sectional area of 1 m 2, will be calculated as a stress of 1 N/m 2 or 1 Pa. Stress is defined as the ratio of the applied force to the cross-sectional area of the material it is applied to. Just like a balloon, for example, regains its original shape after a force is removed after application. When this applied force is removed, the metal regains its original dimensions (unless the force exceeds a certain point). When subjected to loading, the metal undergoes deformation but it may be too small to discern without special tools. Metals are elastic in nature up to a certain extent. There are five different ways in which these forces may be applied on a metal part. The act of applying the force is known as loading. Depending on the magnitude of these forces, the metal may or may not change its shape. XII Why is the Strain-Stress Curve Important? LoadingĪ metal in service or during manufacturing is subjected to different forces.
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