structures and forces - copy
structure
made up of one or more parts
strucural strength
the strength needed to hold itself and any weight added to it
strucural stability
ability to maintain position even when force is added
solid structure
made up of a solid piece
frame structure
made up of rigid arrangement of parts fastned together
shell structure
has a solid outer surface and hollow inside
norman breaky
invented paint roller
michael kelly
invented barbed wire
design
how a structure is put together to complete a task
function
describing what a structure can do
natural structure
made by mother nature
manufactured structure
made by humans
external force
force applied on a structure by something else
mass
amount of matter in an object
centre of gravity
imaginary point of an object where a downward force a gravity acts
symmetry
a balanced arrangement of mass
load
external force on a structure
static load
the weight of the structure and the non living load it supports
dynamic load
an external force that moves changes with time
performance requirements
conditions that a must meet after it is built
beam
flat structure supported at both ends
truss
framework of beams joined together
triangle
strongest structural shape
cantilever
beam supported at one end
structural stress
internal and external forces acting on a structure at one time
strucural fatigue
weakening of a structure do to forces acting on it
structural failure
breakdown of a structure do to forces acting on it
structural stiffness
ability to change in shape under a load
deformation
a change in shape of any structural component
flexibility
ability of a material to be bent under force
brittleness
how easy does the material break
plasticity
how easy is the material to shape
ductility
how easy can the material be made into wire
joints
a place where structural parts are joined together
rigid or fixed joints
rigid to prevent movement
movable joints
flexible or mobile so the structure can move as required
ligaments
flexible connective tissue that connects bone to bone
cartilage
reduces friction between bones and absorbs shock from bumbs
bones
rigid, hard, provides support and protection
margin of safety
limits to within a structures safety
corrugation
forming a material into wave like rigids or folds
lamination
gluing layers of material together to make a strong bond
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