Internal Forces
·
Can be classified
as:
o
Compression – a force that squeezes or presses something together
o
Tension – a force
that stretches apart to expand or lengthen
o
Shear – a force
that pushes in opposite directions
o
Torsion – a force
that twists
o
Bending – A force that
acts to bend a component putting one side of the part in tension and the
opposite side in compression
The forces occur within the human body as well since
the human body is a structure; e.g., when a skater twists, torsion occurs
within her body.
Designing for Forces
Engineers have to consider all these forces when
designing structures, e.g., they have to consider the load of the snow on a
bridge in addition to the truck.
Engineers design structures to withstand a hundred year storm, a large storm that
occurs once in a hundred years.
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