The 4 major categories to be considered in material selection are:
a. Chemical
b. Physical
c. Mechanical
d. Procurement/manufacturing considerations
are material characteristics that relate to the elemental structure of a material and it's chemical reactivity with other materials.
Chemical Properties
are characteristics of materials that pertain to the interaction of these materials with various forms of energy and with the human senses.
Physical Properties
Physical properties are usually measured in a laboratory without harming the material.
phsyics
are characteristics of a material that are displayed when a force is applied.
Mechanical properties
Testing for Mechanical properties usually involves the of the materials sample.
destruction
Some of the key aspects of chemical properties are:
a. Composition
b. Micro structure
c. Crystal Structure
d. Corrosion Resistance
e. Reactivity
A listing of Physical properties would contain:
a. Specific Heat
b. Thermal Expansion
c. Thermal Conductivity
d. Electrical Conductivity
e. Magnetism
f. Color
Specific Heat is the amount of that is required to raise a given mass of material (1 gram) a given temperature change (1°C).
heat energy
The expansion coefficient is a tool for determining how much a material will when it's heated.
Thermal, grow
Thermal Conductivity is the steady state that will be transmitted by a material of a given thickness and temperature differential per unit area.
heat
Materials that are good thermal conductors also tend to be good conductors.
electrical
The only 5 stable elements that are ferromagnetic are:
a. iron
b. nickel
c. cobalt
d. gadolinium
e. dyprosium
All steels, except those with structures are ferromagnetic at room temperatures.
Austenitic (FCC)
Electrical conduction in metals is easy because the valence in metals exist in overlapping bands, so electrons are free to move throughout the bulk of the material.
electrons
The Modulus of Elasticity is a measure of a materials .
stiffness
Poisons Ratio is a way of comparing strain to strain.