Material Science Flashcards
What is the definition of tensile stress?
Tensile stress is the force applied per unit cross-sectional area of the wire.
What is the formula for tensile stress?
Tensile stress = force/cross-sectional area
What is the definition of Tensile Strain?
Tensile strain is defined as the fractional change in the original length of an object.
What is the formula for Tensile strain?
Tensile strain = extension/original length
What is the ultimate tensile strength of a material?
It is the maximum stress that a material can withstand when being stretched before it breaks. Beyond this point the material may become longer and thinner at the weakest point before eventually breaking.
What is a ductile material?
A material that can easily be drawn into a wire or hammered into thin sheets.
What is the limit of proportionality?
The limit of proportionality is the point to which a material obeys Hooke’s law.
What is the young modulus?
The young modulus is the constant ratio of stress to strain in a material.
What is the formula for the young modulus?
Young modulus = tensile stress/ tensile strain
What unit is the young modulus in?
Pascals
What unit is tensile stress in?
Pascals
What unit is tensile strain in?
N/A
What is plastic deformation?
Permanent deformation.
What is a brittle material?
A material for which ultimate tensile strength is the same as breaking strength.
How to calculate work done on the extension of a spring?
Work done = EPE= 1/2kx^2
What is the equation for the EPE of a spring.
EPE =1/2kx^2 = 1/2 force constant x (extension squared)
What is the formula for EPE ( elastic potential energy)?
EPE = 1/2 (extension)^2 x force constant
Look at annotated pag diagram photo
