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Lecture 5
Polymers and Composite Materials
9
Engineering
Undergraduate 4
09/27/2013

Additional Engineering Flashcards

 


 

Cards

Term
polymer properties
Definition

low density

 

low melting point (large molecular weight increases bonding and melting point)

 

low corrosion

 

low thermal and electrical conductivity (C-C bonds are covalent, pi bond increase electron mobility)

Term
Stress-strain Curve
Definition
[image]
Term
What are composites?
Definition
  • mix two materials
  • matrix phase surrounded dispersed phase
  • process seperately and bond together
Term
natual composites
Definition
  • fiber-reinforced
  • tissue -- cells dispersed in extracellular matrix
  • shell -- mineral matrix with organic particles
  • crystalline (load bearing) -- collagen
  • amorphous (elastic bonding) -- elastin
Term
composites: mechanical properties depend on?
Definition

nature and quantity of material

shape and size

bonding between components

Term
reinforcement phase
Definition
dispersion, particle, fiber -reinforced composites
Term
Rule of Mixture (ROM)
Definition

parallel along fibers:

composite modulus = volume percent (a) x modulus (a) + (1 - volume percent (b)) x modulus (b)
= V1E1 + (1 - V1) x E2

 

perpendicular to fibers

E = [V1/E1 + (1 - V1)/E2]^(-1)

Term
Elastin
Definition
  1. least soluble protein
  2. 3D cross-linked network
  3. elastic
  4. difficult to process
Term
collagen
Definition
  1. compact fiber (good strength)
  2. function: skin, tendon, bone, cartilage, blood vessel wall, basement membrane
  3. structure: porous (cell migration, suck blood)
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