Question
In: Mechanical Engineering
1.Why plastic beams are not used to construct buildings and bridges?List THREE properties that make plastics...
1.Why plastic beams are not used to construct buildings and bridges?List THREE properties that make
plastics unsuitable for this application?
2.How a temperature drop of 50 C below 0 C would affect polythene bottle? Explain.
3.What type of bonding explains function of adhesives?
4.Can ceramic materials be used as material for the beams? If not, explain why? List properties that make
them unsuitable for this application?
Solutions
Expert Solution
1. plastic beams are not used for structural applications because they are soft and ductile. Whenever the load applies these plastic beams fractures because of their low fracture toughness.
-----> low strength
-----> Low fracture toughness, low charpy impact toughness
-----> low ultimate tensile strength
-----> prone to creep deformation at low temperatures.
-----> high coefficient of thermal expansion
-----> Low elastic modulus
2.The polyehylene bottle becomes brittle due to glass transition temperature. if the temperature is well below the glass transition temperature it becomes brittle and fractures easily.
3.Adhesives forms the bond by the application of small pressure to stick the adherend with adhesive. They are designed to have a balance between the flow and resistance to flow. the bond forms because the adhesive is soft nough to flow / wet the adherend.
4.Ceramic materials are not suitable for structural applications because they are rigid and brittle. uppon application of load they simply fracutures.
-----> highly brittle (no plastic defrmation)
-----> low impact strength and low fracture toughness.
-----> low ultimate tensile strength
samet mamat answered 2 years agoRelated Solutions
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Sycamore Plastics (SP) is a manufacturer of polyethylene plastic
pellets used as a raw material by manufacturers of plastic goods
around the U.S. SP currently operates four manufacturing centers in
Philadelphia, PA; Atlanta, GA; St. Louis, MO; and Salt Lake City,
UT. The plants have different capacities and production costs as
indicated in the table below.
PLANT
MAXIMUM
CAPACITY
(× 100,000 LBS.)
PROD.
COST
(PER 1,000 LBS.)
Philadelphia
8.1
$322.00
Atlanta
9.2
$272.00
St. Louis
12.1
$302.00
Salt Lake City...
Sycamore Plastics (SP) is a manufacturer of polyethylene plastic pellets used as a raw material by...
Sycamore Plastics (SP) is a manufacturer of polyethylene plastic
pellets used as a raw material by manufacturers of plastic goods
around the U.S. SP currently operates four manufacturing centers in
Philadelphia, PA; Atlanta, GA; St. Louis, MO; and Salt Lake City,
UT. The plants have different capacities and production costs as
indicated in the table below.
PLANT
MAXIMUM
CAPACITY
(× 100,000 LBS.)
PROD.
COST
(PER 1,000 LBS.)
Philadelphia
8.0
$321.00
Atlanta
9.2
$271.00
St. Louis
12.1
$301.00
Salt Lake City...
Sycamore Plastics (SP) is a manufacturer of polyethylene plastic pellets used as a raw material by...
Sycamore Plastics (SP) is a manufacturer of polyethylene plastic
pellets used as a raw material by manufacturers of plastic goods
around the U.S. SP currently operates four manufacturing centers in
Philadelphia, PA; Atlanta, GA; St. Louis, MO; and Salt Lake City,
UT. The plants have different capacities and production costs as
indicated in the table below.
PLANT
MAXIMUM
CAPACITY
(× 100,000 LBS.)
PROD.
COST
(PER 1,000 LBS.)
Philadelphia
7.5
$326.00
Atlanta
9.5
$278.00
St. Louis
12.5
$306.00
Salt Lake City...
Sycamore Plastics (SP) is a manufacturer of polyethylene plastic pellets used as a raw material by...
Sycamore Plastics (SP) is a manufacturer of polyethylene plastic
pellets used as a raw material by manufacturers of plastic goods
around the U.S. SP currently operates four manufacturing centers in
Philadelphia, PA; Atlanta, GA; St. Louis, MO; and Salt Lake City,
UT. The plants have different capacities and production costs as
indicated in the table below.
PLANT
MAXIMUM
CAPACITY
(× 100,000 LBS.)
PROD.
COST
(PER 1,000 LBS.)
Philadelphia
7.4
$334.00
Atlanta
9.1
$284.00
St. Louis
12.0
$314.00
Salt Lake
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NOK Plastics is considering the acquisition of a new plastic injection-molding machine to make a line...
NOK Plastics is considering the acquisition of a new plastic
injection-molding machine to make a line of plastic fittings. The
cost of the machine and dies is $125,000. Shipping and installation
is another $8,000. NOK estimates that new project will require
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three will be recovered at the end of the life of the
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Sales of the new plastic fittings...
Piscataway Plastics Company manufactures a highly specialized plastic that is used extensively in the automobile industry....
Piscataway Plastics Company manufactures a highly specialized
plastic that is used extensively in the automobile industry. The
following data have been compiled for the month of June. Conversion
activity occurs uniformly throughout the production process.
Work in process,
June 1—40,000 units:
Direct material:
100% complete, cost of
$
219,500
Conversion: 40%
complete, cost of
61,800
Balance in work in
process, June 1
$
281,300
Units started during
June
220,000
Units completed
during June and transferred out to finished-goods inventory
190,000...
Piscataway Plastics Company manufactures a highly specialized plastic that is used extensively in the automobile industry....
Piscataway Plastics Company manufactures a highly specialized
plastic that is used extensively in the automobile industry. The
following data have been compiled for the month of June. Conversion
activity occurs uniformly throughout the production process.
Work in process, June 1—60,000 units:
Direct material: 100% complete, cost of
$
292,500
Conversion: 40% complete, cost of
159,200
Balance in work in process, June 1
$
451,700
Units started during June
240,000
Units completed during June and transferred out to
finished-goods inventory
190,000...
Piscataway Plastics Company manufactures a highly specialized plastic that is used extensively in the automobile industry....
Piscataway Plastics Company manufactures a highly specialized
plastic that is used extensively in the automobile industry. The
following data have been compiled for the month of June. Conversion
activity occurs uniformly throughout the production process.
Work in process, June 1—60,000 units:
Direct material: 100% complete, cost of
$
292,500
Conversion: 40% complete, cost of
159,200
Balance in work in process, June 1
$
451,700
Units started during June
240,000
Units completed during June and transferred out to
finished-goods inventory
190,000...
Piscataway Plastics Company manufactures a highly specialized plastic that is used extensively in the automobile industry....
Piscataway Plastics Company manufactures a highly specialized
plastic that is used extensively in the automobile industry. The
following data have been compiled for the month of June. Conversion
activity occurs uniformly throughout the production process.
Work in process, June 1—40,000 units:
Direct material: 100% complete, cost of
$
155,500
Conversion: 40% complete, cost of
25,200
Balance in work in process, June 1
$
180,700
Units started during June
200,000
Units completed during June and transferred out to
finished-goods inventory
190,000...
Piscataway Plastics Company manufactures a highly specialized plastic that is used extensively in the automobile industry....
Piscataway Plastics Company manufactures a highly specialized
plastic that is used extensively in the automobile industry. The
following data have been compiled for the month of June. Conversion
activity occurs uniformly throughout the production process.
Work in process, June 1—60,000 units:
Direct material: 100% complete, cost of
$
285,000
Conversion: 40% complete, cost of
174,800
Balance in work in process, June 1
$
459,800
Units started during June
240,000
Units completed during June and transferred out to
finished-goods inventory
200,000...
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