Materials Flashcards
what are the 5 basic mechanisms of failure for steel structures
ductile yielding, fracture, fatigue, stress corrosion cracking and creep
what is yielding
when steel’s elastic limit is exceeded therefore causing it to undergo plastic deformation before reaching its final tensile strength
What does brittle fracture initiate from
Stress concentrations
What is fatigue?
The initiation of cracks due to cyclic loading
What is corrosion
Presence of moisture and oxygen causing not
How can corrosion be prevented
Paint in waterproof coating
What is creep
the continuous accumulation of inelastic deformation
What is glulam
A natural alternative to steel or concrete
Advantages of glulam
Fire resistant
Earthquake resilient
Durable
Lightweight
Versatile
Aesthetically Pleasing
Energy conserving
Why is glulam a better alternative
Low embodied energy
Made from renewable resources (timber)
Natural appearance = good to look at
Long lengths
Improved strength to weight ratio compared to alternatives
describe two benefits of using protective coatings in mild steel
to minimise maintenance as the coating will allow for easy cleaning
why is stainless steel more preferred than aluminium for a pool step (4)
stainless steel is less prone to corrosion (1) therefore is less likely to deteriorate in treated water (1)
Stainless steel has a lower embedded energy (1) therefore it is a more sustainable construction material (1)
Stainless steel is less likely to deform when under load (1)
two causes of degradation in timber
wet rot
Dry rot
Woodworm
explain 2 properties of uPVC that make it suitable for window frames
it is corrosion resistant (1) therefore has an extended lifespan (1)
it is inert (1) so it will not pollute rainwater run-off (1)
explain one advantage of using aluminium alloys for doors and window frames (2)
aluminium alloys have a long lifespan (1) reducing the need to replace the window (1)
