PTFE 3720 Quiz 1a - Fall 2009 - KEY

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

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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)

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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
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## 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.

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

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