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Structures (Stresses (Types of stresses (TRACTION:
Forces try to stretch…
Structures
Stresses
This internal tension is called stress.It happens to all bodies subjected to the applying of one or more forces on them.
Types of stresses
TRACTION:
Forces try to stretch the object they are acting upon.Opposing forces move outwards away from the body along the same trajectory but in opposite directions.
Bending
Forces try to bend a body.This stress acts on elements that are supported at their extremities and have a weight applied to them.Normally,there are two forces that are separated by a certain distance and a third force acting in the opposite direction
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Compression
Forces try to flatten or compress a body.Opposing forces move inwards towards one another along the same trajectory and in opposite direction.The body tends to lose its shape and becomes compressed.
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Shear or cutting
The forces act like two scissor blades:they are very close together,moving in opposite directions,as they try to cut an object.
This stress is the same when we put an object aver the edeg od a table and hit it to try and break it.This is also calles tensile stress.
Forces
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Definition:A force is anything that can deforma body(static effect) or change its state of movement or rest(dynamic effect)
Structures
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The two types of loads
Fixed or permanent loads dont vary over time.They always affect the structure in the same way.For example,the objects own weight,the weight of bodies always on top of another object,etc.
Variable loads are occasinal and changeable.For example,the weight of snow on a roof,the pressure of water on a dam(the water level can vary)etc.
