Lecture 1- intro to materials

.pdf

School

Concordia University *

*We aren’t endorsed by this school

Course

221

Subject

Material Science

Date

Oct 30, 2023

Type

pdf

Pages

Uploaded by HighnessTitanium11411

1- Intro to materials What are the 3 major classes of material? Briefly explain them and their properties. Metals: Made of inorganic metallic elements. Conduct heat and electricity well, strong and ductile Ceramics: Made of inorganic materials (metals and non metals). Hard and strong, but brittle. High temperature use, low density, electrically insulating. Polymers: Plastics (mat made from polymers). Electrical insulators, low density, low operating temps. It is usually a long chain molecules and networks based on carbon What are the 3 subsets? Briefly explain them and their properties. Composites Mixture of 2+ materials. There is usu a matrix/reinforcement particle/fiber They have a combo of properties usu. Ex: GFRP, reinforce concrete, carbon fiber Semi conductors Has electrical properties between conductors n insulators. Usually silicon based with added dopant element (added el. To make better…) (ex: switches, sensors, devices) Biomaterials Used for implants in living bodies Non toxic, bio compatible. Name 2 types of metals Pure metal: 99-99.99% pure Alloy: combo of 2 or more metals + non metals What are the different graphs and what do they measure? Make sure you can read the graphs in lecture 1! Density graph: Measures the density of a material; anything under 1 floats on water Stiffness graph (aka young modulus, elastus modulus): Measures in gigapascals how much a material will bend when a load is applied to it. A low modulus of elasticity means that you don’t have to put much pressure to deform. Tensile strength: measure the amount of megapascal is takes to pull apart a material. Resistance to fracture Electrical conductivity

***it is important to know that the graphs are measured on a log scale*** Name the factors that affect material selection Price, availability, properties, substitute, recycling,

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version