Engineering Materials Ch 3
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The 4 major categories to be considered in material selection are:
d. Procurement/manufacturing considerations
are material characteristics that relate to the elemental structure of a material and it's chemical reactivity with other materials.
are characteristics of materials that pertain to the interaction of these materials with various forms of energy and with the human senses.
Physical properties are usually measured in a laboratory without harming the material.
are characteristics of a material that are displayed when a force is applied.
Testing for Mechanical properties usually involves the of the materials sample.
Some of the key aspects of chemical properties are:
b. Micro structure
c. Crystal Structure
d. Corrosion Resistance
A listing of Physical properties would contain:
a. Specific Heat
b. Thermal Expansion
c. Thermal Conductivity
d. Electrical Conductivity
Specific Heat is the amount of that is required to raise a given mass of material (1 gram) a given temperature change (1°C).
The expansion coefficient is a tool for determining how much a material will when it's heated.
Thermal Conductivity is the steady state that will be transmitted by a material of a given thickness and temperature differential per unit area.
Materials that are good thermal conductors also tend to be good conductors.
The only 5 stable elements that are ferromagnetic are:
All steels, except those with structures are ferromagnetic at room temperatures.
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.
The Modulus of Elasticity is a measure of a materials .
Poisons Ratio is a way of comparing strain to strain.
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