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Breaking stress (ultimate tensile strength)
the maximum stress an object can withstand before failure occurs
Brittle
An object that shows very little strain before reaching breaking stres
Ductility
A material that can easily and permanently be stretched e.g. copper
Elastic behaviour
If a material
Elastic limit
The force beyond which a force will no longer deform elastically instead plastically. When load removed will not return to original shape
Elastic strain energy
Energy stored in an object when stretched
(Area under graph)
Hooke’s Law
The extension of an elastic object is directly proportional to the force applied to it until the object’s proportionality
Limit of proportionality
The point to which it supports hooke’s law
Extension proportional to force applied
Plastic behaviour
Does not return to it’s original shape (object permanently deformed
Spring constant
Constant of proportionality for the extention (of spring) under force. Higher the constant the more stiff the spring is
Stiffness
Measure of how difficult it is to Stretch an object
Tensile strain
The ratio of an objects extension to its original length (it is the ratio of 2 lengths, has no unit)
Tensile strength
The amount of force acting per unit area measured in Pa
Yield point, Y
Beyond a certain point the elastic limit of a point is reached where small increases in stress results in massive extention. The material will not return to original length will behave like plastic
Young Modulus
Ratio of stress to strain for a given material (measured in Pa)
