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ginocchio di caduta

English translation: rupture/deterioration/stress/failure test curve

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Italian term or phrase:ginocchio di caduta
English translation:rupture/deterioration/stress/failure test curve
Entered by: Rosanna Palermo
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15:08 Mar 29, 2007
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.

Thank you!
Giuliana
Giuliana d'Orazi Flavoni
Italy
Local time: 01:52
rupture/deterioration/stress/failure test curve
Explanation:
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)
Eqn. 3
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.

Selected response from:

Rosanna Palermo
Local time: 18:52
Grading comment
Thank you!!
4 KudoZ points were awarded for this answer

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Summary of answers provided
4rupture/deterioration/stress/failure test curve
Rosanna Palermo


Discussion entries: 1





  

Answers


7 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
rupture/deterioration/stress/failure test curve


Explanation:
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)
Eqn. 3
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.




    Reference: http://www.janalab.com/expertise_testing_hydrostatic.php?sel...
Rosanna Palermo
Local time: 18:52
Specializes in field
Native speaker of: Native in ItalianItalian, Native in EnglishEnglish
PRO pts in category: 170
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