deformation of solids Flashcards
tensile force
forces that stretch
compressive force
forces that compress a body
elastic deformation
the body will return to its original shape when the load is removed
plastic deformation
the body will not return to its original shape when the load is removed
ultimate tensile stress or breaking stress
the maximum stress that a material can withstand before breaking
yield point
if the stress is increased beyond the elastic limit, a point is reached at where there is a marked increase in extension
strength
the maximum force which can be applied to a material without it breaking
stiffness
the resistance which a material offers to having its size and shape changed
ductility
a ductile material is one which can be permanently stretched
brightess
a brittle material cannot be permanently stretched; it breaks soon after the elastic limit has been reached. brittle materials are often strong in compressions
what kind of material is copper and how does it deform
ductile material and deforms plastically
what kind of material is glass and how does it deform
brittle material that deforms elastically and breaks
what kind of material is rubber and how does it deform
polymeric material and deforms by elastic hysteresis (does not return to original length by the same path)
what is stress
the force per unit cross sectional area
what is strain
the extension per unit length of the un-stretched wire
