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mechanical/mmme1029_materials.md
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@ -107,7 +107,9 @@ work:
# Lecture 2 # Lecture 2
## Metals ## Properties of the Classes
### Metals
- Ductile (yields before fracture) - Ductile (yields before fracture)
- High UFS (Ultimate Fracture Stress) in tension and compression - High UFS (Ultimate Fracture Stress) in tension and compression
@ -116,7 +118,7 @@ work:
- High melting point - High melting point
- High electric and thermal conductivity - High electric and thermal conductivity
## Ceramics and Glasses ### Ceramics and Glasses
- Brittle --- elastic to failure, no yield - Brittle --- elastic to failure, no yield
- Hard (harder than metals) - Hard (harder than metals)
@ -129,7 +131,7 @@ work:
- Poor thermal and electric conductivity - Poor thermal and electric conductivity
- Wide range of magnetic and dielectric behaviours - Wide range of magnetic and dielectric behaviours
## Polymers ### Polymers
- Organic---as in organic chemistry (i.e. carbon based) - Organic---as in organic chemistry (i.e. carbon based)
- Ductile - Ductile
@ -141,7 +143,7 @@ work:
- There are some electrically conductive polymers - There are some electrically conductive polymers
## Composites ### Composites
- Composed of 2 or more materials on any scale from atomic to mm scale to produce properties that - Composed of 2 or more materials on any scale from atomic to mm scale to produce properties that
cannot be obtained in a single material cannot be obtained in a single material
@ -150,13 +152,15 @@ work:
- Material propertes depends on what its made of - Material propertes depends on what its made of
## Organic vs Inorganic Materials ## Terms
### Organic vs Inorganic Materials
- Organic materials are carbon based - Organic materials are carbon based
- From chemistry, organic compounds are ones with a C-H bond - From chemistry, organic compounds are ones with a C-H bond
- Inorganic compounds do not contain the C-H bond - Inorganic compounds do not contain the C-H bond
## Crystalline vs Non-Crystalline Materials ### Crystalline vs Non-Crystalline Materials
- Most things are crystalline - Most things are crystalline
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- Ceramics - Ceramics
- Glasses are non-crystalline - Glasses are non-crystalline
## Material Density
## Material Properties
### Density
$$\rho = \frac m v$$ $$\rho = \frac m v$$
@ -179,7 +186,7 @@ $$\rho = \frac m v$$
e.g. composites with a metal matrix will have a much higher density than those with a polymer e.g. composites with a metal matrix will have a much higher density than those with a polymer
matrix matrix
## Material Melting Points ### Melting Points
- Measured at standard pressure and in an intert atmosphere (e.g. with Nitrogen, Argon, etc) - Measured at standard pressure and in an intert atmosphere (e.g. with Nitrogen, Argon, etc)
@ -188,7 +195,7 @@ $$\rho = \frac m v$$
- High melting points -> high chemical bond strength - High melting points -> high chemical bond strength
## Material Corrosion ### Corrosion
- It's not just metals that corrode - It's not just metals that corrode