General Flashcards
(31 cards)
What does the strength of materials deal with?
The relationship between external forces, deformation and internal stresses.
What is the formula for strength of material qualifications based on?
Mathematical analyses
What is density?
A measure of mass per unit volume
What unit is density
Kg/m3
Why is aluminium preferred to steel?
It is less dense
What is fatigue?
Starts off as a stress concentrator (scratch) and can rapidly increase
What is elasticity?
When a body has been deformed, it then returns back to its original shape when the forces are removed
What is stress?
The force per unit area
Si Unit for force
N/m2 or pascals
What is the imperial unit for stress
Psi
If a material can withstand a lot of stress it is said to be…?
Strong
Why is tensile stress
Stretch or lengthening
What is compressive stress
Compressing or shortening
What is shearing stress
To shear the material
What is combined stress
More than one form of stress acting on an object
What is simple stress?
One form of stress
What is unit strain
Deformation / original dimension
What is poisons ratio?
Lateral strain / longitudinal strain
Define hardness
A material to resist penetration, wear or cutting action
Define strength
Material to withstand deformation or stress without breaking
Define plasticity
A metal allows it to be re shaped
Define Ductility
Allows a metal to be drawn into thinner sections without breaking
Define malleability
Allows the material to be stretched or shaped without breaking
Define toughness
Metal which allows it to be deformed without breaking
