WorksheetsMTPC POLYMERS, COMPOSITES AND CERAMICS LAB- QUIZ
Total questions: 15
Worksheet time: 8mins
Failure due to creep in air is called?
Creep failure
Stress rupture
Tensile rupture strain
Creep rupture
Lower molar mass and short polymer chain will results in increase in ESC in short period of time
True
False
ESC behavior is prevelent in which of the following material?
Glassy, amorphous thermoplastics
Metallic crstals
Bulk metallic glasses
Thermosetting plastics
what is the percentage of plastic product that is associated with ESC failure every year?
10-15%
25-30%
45-50%
50-55%
What are the methods used to analyse the failure mechanisms in past?
Scanning electron microscopy
Factographic method
Graphical method
All the above
Current research deals with application of ___________ to study of ESC phenomena
Rupture mechanism
Creep failure
Fracture mechanism
None of the above
Amorphous polymers are more prone to ESC at
(Tg is glass transition temperature)
Tg
Higher than Tg
Lower than Tg
Nowhere near to Tg
ESC is accelerated due to
Higher temperature
Cyclic loading
Fatigue
All the above
Which of the localised concentration factors tends to increase the ESC?
Notches
Inclusions
Voids
Grain boundary
The graph is plotted on which type of graph paper?
Logarithmic paper
Isometric graph paper
Graph engineering paper
Hexagonal paper
why do we divide the number of failures divided by one more than the number of original specimens?
Produces a symmetrical treatment of the data
Enables plotting all the data points
Is easy to remember without a table
All the above
Which methods involves exposure of specimen to chemical fluids?
Bell telephone test
Bergen jig method
Polyethylene notch tensile test (PENT)
None of the above
The extension of controlled imperfection shall be constructed as a failure of the specimen.
True
False
What is the shape of the specimen cut for performing the experiment?
Square
Circle
V-shaped
Rectangle
Controlled imperfection in the specimen is made using
Arbour press
Vise
Blanking die
Jig
