Materials Flashcards
1
Q
Strength
A
its ability to resist force.
2
Q
Elasticity
A
its ability to return to its original shape or length once a load or force acting on it is removed.
3
Q
Plasticity
A
one that will change shape/length under a load but will stay in the deformed shape once the load is removed
4
Q
Ductility
A
one that can bend and stretch without breaking
5
Q
Brittleness
A
one that is easily cracked, snapped or broken when a force is applied.
6
Q
Malleability
A
it can be shaped, worked or formed without fracturing
7
Q
Tensile Graph
A
See jotter
between points 0 and A = Elastic Region Point A = Limit of elasticity Point B = Yield Point between point B and D = plastic range Point C = Ultimate load between points C and D = the amount of force the material can withstand point D = breaking point
8
Q
σ = F/A
stress
A
σ = stress (Nm-2) F = Force (N) A = area (m^2)
9
Q
ε = Δl/l
strain
A
ε = strain (no unit) Δl = change in length (m) l = length (m)
10
Q
Stress-Strain Graph
A
See jotter
Ultimate Tensile Stress = at the maximum yield strain
Yield Stress = at the end of the elastic range
11
Q
Young’s Modulus
A
E = σ/ε
E = Young's Modulus σ = Stress (Nm-2) ε = Strain (no unit)
12
Q
Factor of Safety
A
common reasons for a structural failure Overloading Material Failure Joint Failure Fatigue
