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|Italian to English translations [PRO]|
Tech/Engineering - Mechanics / Mech Engineering / tubing and sections
|Italian term or phrase: ginocchio di caduta|
|Hello everyone :)|
I'm still working on tubing and still having problems. This time however, we are comparing GRP tubing with HPDE tubing... in terms of its features/characteristics etc....
and I'm really having problems with this sentence:
In generale la resistenza alla temperatura è buona (70-.80 °C di esercizio), la durata di vita di un PRFV di ottima qualità determinata secondo le ASTM D2992 non presenta il "ginocchio tipico di caduta" delle resine termoplastiche quindi, in teoria, un tubo in PRFV impiegante resine di primissima qualità sarebbe da ritenersi superiore a qualunque altro tipo di tubo.
What do you think?
I'm guessing "curve" for the moment, but I really don't know and would be very grateful for any suggestions.
|rupture/deterioration/stress/failure test curve|
It refers to the "curve" of material deterioration test over time as explained in the link below. I copied the most pertaining portions for you.. :o)
A number of testing methodologies have been developed to determine a pipe material's resistance to brittle mechanical or slow crack growth failure. For some materials, Slow Crack Growth behavior can be determined through Hydrostatic Pressure Testing. A change in the slope of the Log [Stress] versus Log [Failure Time] curve, often referred to as a "Knee", is typically observed for the transition from ductile to brittle failure mechanisms (see Figure 1).
For ISO 9080 Hydrostatic Pressure Testing is conducted at a number of temperatures. The data (ductile and brittle failures) is then modeled based on the three coefficient rate process extrapolation equation (Eqn. 2) or the 4-Parameter model:
log(Failure Time) = A + B/Temp + C/Temp*log(Stress) + D*log(Stress)
where A, B, C and D are constants. In the analysis of the data, statistical methods are employed to detect the "Knee". In the case of materials that do exhibit a knee, the pressure rating that is developed accounts for the potential of brittle failure.
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