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| Stress |
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| Elastic bodies regain their original shape due to internal restoring forces. This internal restoring force, acting per unit area of a deformed body, is called a stress. |
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| An object can be deformed in different ways. |
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| Here, the deforming forces act normally over an area of a body. The normal stress is subdivided into two categories: |
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| Tensile stress |
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| If there is an increase in the length of the body in the direction of force applied, the stress set up, is called tensile stress. |
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| Compression stress |
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| If there is a decrease in length (decrease in volume) due to the force applied, the stress is compression stress |
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| When the deforming force act tangential to the surface of the body, then this tangential force per unit area is called tangential stress (F). See diagram below. |
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