Hydrostatic pressure effects on 1/4 inch polypropylene line.

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Author
Harder, Ronald Erwin.
Date
1972Advisor
Thornton, E.B.
Tucker, S.P.
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Show full item recordAbstract
The effects of hydrostatic pressure on the mechanical properties of
1/4 inch polypropylene line were investigated. The line was exposed to
hydrostatic pressures of 5,000 and 10,000 psi for periods of 6, 12, and
24 hours, respectively. Upon completion of the pressurization period,
the line was removed from the pressure vessel and its ultimate tensile
strength recorded and compared to that of the line before pressurization.
There was an increase in the tensile strength of the line as pressure
increased and time progressed, with a maximum increase of 3.1 percent
occurring after pressurization at 10,000 psi for 12 hours and at 5,000
psi for 24 hours. Secondly, there was no measurable difference in the
relative elongation of the line after pressurization as compared to that
before pressurization. The mode of failure was investigated by testing
individual line fibers. Microscopic observation after failure showed no
discernible difference between the mode of failure before and after
pressurization. In each case, the fibers presented a somewhat jagged
edge and the outer portions of the fiber appeared to have peeled back.
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