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CHAPTER 3 Material Properties (successful product :trophy: (desirability …
CHAPTER 3
Material Properties
successful product :trophy:
perform well :check:
Good value for money :money_with_wings:
Gives pleasure to user :<3:
best materials for the job :male-office-worker:
desirability :stars:
capability :woman-lifting-weights:
viability
taken from 'Hugh Dubberly'
classes of Eng. Material :explode:
METAL :nut_and_bolt:
high moduli
strengthen via alloying & treatment :hospital:
still ductile
prey to fatigue :frowning_face:
least resistant to corrosion :hocho:
CERAMIC & GLASSES :eyeglasses:
High moduli
Brittle
low stress concentrations :arrow_double_down:
high contact stresses :
stiff :snowflake:
hard :helmet_with_white_cross:
abrasion-resistant :forbidden:
Retain strength to high temperatures :thermometer:
Corrosion resistant. :dagger_knife:
POLYMER & ELASTOMERS
Low moduli
50 times less than metals
can be strong as metals :man-lifting-weights::skin-tone-3:
Large elastic deflections
Creep at room temperature :mushroom:
Easy to shape :two_hearts:
Corrosion resistant
Low coefficients of friction :fries:
COMPOSITE :file_cabinet:
Light, stiff, strong & tough :male-astronaut:
Presently polymer matrix (epoxy or polyester)
fiber reinforcements (glass, carbon or Kevlar)
Application temperature limit of 250°C due to softening of the matrix :hot_pepper:
expensive :money_mouth_face:
difficult to form & join :cry:
added performance justifies the added cost. :money_with_wings: