Materials Flashcards
What is density
The density of an object is a measure of mass per unit volume and is measured in kg/m3
What is fatigue
When a metal is subjected to cyclic loadings, it will (after sufficient repetitions) start to crack.
What is Elasticity
A body is said to be perfectly elastic if, after it has been deformed by external forces, it returns completely to its original shape when the forces are removed
What is stress
Stress is defined as the force per unit area
What is tensile stress
If the stress is the result of forces tending to stretch or lengthen the material
What are the 3 mains stresses an aircraft is subject to
Tensile
compression
Sheering
What is a simple stress
When 1 stress is acting alone
What is a combined stress
When 2 or more forces acting together
What is poison ratio
Is a material is stressed it will be come thinner
What is hardness
Enables a material to resist penetration, wear or cutting action.
What is strength
The ability of a material to withstand forces which tend to deform the metal in any direction, or the ability of a material to resist stress without breaking
What is elasticity
The ability of an object or material to be stretched and recover its size and shape after deformation
What is plasticity
The property of a metal which allows it to be reshaped.
What is ductility
The property which allows metal to be drawn into thinner sections without breaking.
What is malleability
That characteristic of material that allows it to be stretched or shaped by beating with a hammer or passing through rollers without breaking.
What is toughness
The property of a metal which allows it to be deformed without breaking.
What is brittleness
The property of a metal to break when deformed or hammered
What is conductivity
The characteristic of a material which makes it possible for it to transmit heat or electricity.
What is durability
The property of metal that enables it to withstand force over a period of time
What is a ferrous material
Iron or any alloy containing it
What is non ferrous
A metal that contains little or no iron
What are the primary material used in aircraft
Aluminium and aluminium alloy
Titanium and titanium alloy
Magnesium and magnesium alloy
What density must aircraft metal be under
5
What is a crystal structure
a rigid body in which the constituent particles are arranged in a repeating pattern
What is a BCC
Body centred cubic
9 atoms
What is a FCC
Face cantered cubic
14 atoms
