CH 16 - Composites

Question 1

Define compostie

Answer 1

• combination of two or more individual materials

- multiphase material that is usually artificially made

Question 2

What are the two keys to composites?

Answer 2

• adhesion between components

- matrix and dispersed phases

Question 3

What are the purposes of the matrix phase?

Answer 3

• transfer stress to dispersed phase

- protect dispersed phase from environment

Question 4

What is the purpose of an MMC matrix?

Answer 4

increase yield & tensile, creep resist

Question 5

What is the purpose of a CMC matrix?

Answer 5

increase plane strain fracture strength

Question 6

What is the purpose of a PMC matrix?

Answer 6

increase elastic modulus, yield & tensile, creep resist

Question 7

What are the three classification of composites?

Answer 7

particle-reinforced, fiber-reinforced, structural

Question 8

What are the characteristics of fiber-reinforced composites?

Answer 8

• fibers very strong in tension

- provide significant strength improvement to the composite

Question 9

What are the types of fibers?

Answer 9

whiskers, fibers & wires

Question 10

What are the characteristics of fiber whiskers?

Answer 10

• thin single crystals
• large length to diameter ratios
• high crystal perfection
• expensive and difficult to disperse

Question 11

What are the characteristics of fibers?

Answer 11

• polycrystalline or amorphous

- generally polymers or ceramic

Question 12

What are the types of structural composites?

Answer 12

laminates & sandwich panels

Question 13

What are the characteristics of laminates?

Answer 13

-stacked and bonded fiber reinforced sheets

Question 14

What are the characteristics of sandwich panels?

Answer 14

-honeycomb core between two facing sheets