Lezione 2: Family trees for materials and processes Flashcards
1
Q
Which are the 6 families of materials
A
Metals Polymers Elastomers Glasses Ceramics Hybrids
2
Q
Characteristics of ceramics
A
High E: very stiff Hard Abrasion and corrosion resistant Good strength at high T Brittle: low K1c
3
Q
Characteristics of glasses
A
Hard Corrosion resistant Electrical insulators Transparent Brittle
4
Q
Characteristics of polymers
A
Light Easily shaped High strength x unit weight Lack of stiffness Highly sensible to T
5
Q
Characteristics of elastomers
A
Lack of stiffness
Return to shape after stretch
Relatively strong and tough
6
Q
Characteristics of metals
A
Tough Stiff Ductile Wide range of strengths Thermal and electrical conductors Low corrosion resistance
7
Q
Characteristics of hybrids
A
Expensive
Difficult to shape/join
Properties depend of the material mix
8
Q
What are the classes of processes
A
Primary shaping (create shape)
Secondary shaping (modify shape or properties)
Joining
Surface treatment
9
Q
Why do we use material property charts and which are the 2 main types
A
They give an overview of physical, mechanical and functional properties and they can be used as a tool for optimized material selection.
Main types:
-Bar chart (1 property)
-Bubble chart (2 properties)
