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Structures (Stresses ((1.Link your two index fingers and pull on them.,…
Structures
Stresses
When you make a physical effort you may notice that you can feel tension that increases as the effort increases
Objects do not have feelings, but forces act on them in a similar way and produce deformations. In both cases this internal tension is called stress.
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- Press the palms of your hands together
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Main types of stresses
Compression 
Forces try to flatten or copress a body. Opposing forces move inwards towards one another along the same trajectory and in opposite directions.
Bending
Forces try to bend a body. This stress acts on elements that are supported at their extremites and have a weight applied to them
Tosion
Forces try to twist a body. They try to turn the ends of the ends of the body in opposite directions.
Cutting
The forces act like two scissor blades: they are very close together, moving in opposite directions, as they try to cut an object
Definition
A structure is the set of elements in a body that are intended to resist the efects of the forces that act on it.
Structures are necessary because all bodies are subjected to the effects of forces that tend to deform them
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