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15:08 Mar 29, 2007 |
Italian to English translations [PRO] Tech/Engineering - Mechanics / Mech Engineering / tubing and sections | |||||||
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| Selected response from: Rosanna Palermo Local time: 21:19 | ||||||
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4 | rupture/deterioration/stress/failure test curve |
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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... |
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