PTFE 3720 Quiz 1a - Fall 2009 - KEY

PTFE 3720 Quiz 1a - Fall 2009 - KEY - PTFE 3720 Quiz 1a...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
PTFE 3720 Quiz 1a September 16, 2009 Name _________________________ By signing below, you indicate that you will not discuss this quiz with anyone until after TUESDAY, September 22, 2009. __________________________________ 454 g = 1 pound 1 meter = 1.09 yards 1. 4 pts What is the denier for a nylon monofilament yarn that has a diameter of 0.25 mm? Assume that the density for nylon is 1.19 g/cm 3 (show all work). 2. 4 pts What is the cotton count for a cotton yarn that has a diameter of 0.5 mm (Assume that the density of the yarn is 0.91 g/cm 3 )? Show all of your work. 3. 4 pts What length of 1400 denier fiber can be made from 100 pounds of polyester? Assume that the density of polyester is 1.38 g/ cm 3 (show all work). 4. 4 pts Draw a typical cross section for the following fibers? See book a. Cotton lima bean shape (see book)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
b. A dry spun fiber such as acetate fiber has circular cross-section with serrated edges (see book) c. A melt spun fiber used in carpet trilobal fiber is typically used (see book) 5. 4 pts In a tensile test, the stress-strain curve is used to show the results of the test. Draw a typical stess-strain curve and identify the following features: a. Initial modulus (slope of stress/strain curve) b. Tensile strength (same as tenacity = stress at the failure point) c. Tenacity (same as tensile strength = stress at the failure point) d. Failure strain (same as elongation at break = strain at failure point) e. Elongation at break (same as failure strain= strain at the failure point) f. Work of rupture (same as toughness and energy to break = area under stress/strain curve) g. Toughness (same as work of rupture and energy to break = area under stress/strain curve) Questions 6-45 are worth 2 points each. 6. A composite is made of a ________________ and a _______________. a. Polymer and metal
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/08/2012 for the course MATERIALS 3720 taught by Professor Realff during the Spring '11 term at Georgia Tech.

Page1 / 7

PTFE 3720 Quiz 1a - Fall 2009 - KEY - PTFE 3720 Quiz 1a...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online