Year 1- Mechanics and Materials Flashcards
Density definition
Mass per unit volume of a material
Density equation
density (p) (kgm-3) = mass (metres) / volume (metres cubed)
Elasticity definition
The ability for an object to resume to its normal shape after being stretched or compressed
Limit of proportionality definition
The point of which Hooke’s Law is no longer obeyed
What is Hooke’s Law
Extension is proportional to the force applied
Elastic limit definition
The final point where the material will return to its original length
Yield point definition
Beyond the elastic limit a point where a small increase in stress causes a massive increase in extension
Plasticity definition
If a material does not return to its original length, then it is described as plastic
Stress definition
Force in terms of metal
Strain definition
Extension in terms of metal
Breaking stress definition
Maximum stress (force) that can be applied to the material without breaking itB
Breaking point definition
Where the material breaks
Stiffness definition
How flexible an object is, the more stiff, the less flexible
Ductility definition
How easily and permanently and object can be stretched, for exam copper can be made into thin wires, and will not go back to its original shape
Brittleness
A brittle material obeys Hooke’s La
