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A short-term creep test shows that the addition of 0.01 wt% Zr significantly increases the time to rupture.
For designs that use tubes, the rate of crack growth can be used to estimate the time to rupture.
A relationship between conventional and SPC tests has been established, by comparing time to rupture, as well as the Larson-Miller (LM) and Orr-Sherby-Dorn (OSD) parameters.
The Monkman Grant relation and its modification were successfully used to correlate minimum creep rate, time to rupture, and strain at rupture data.
Straight lines can be fitted well to the log log plots of creep stress level against the time to rupture over the restricted range of time for all fiber orientations, regardless of the test temperature.
Gr.92 exhibits a significant decrease in time to rupture after thermal cycle to a peak temperature near AC3, while the creep life of Gr.92N, subjected to only normalizing but no tempering, and 9Cr-boron steel is substantially the same as that of the base metals.
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On the other hand, the LM and OSD parameters have been obtained from the results of the SPC tests (turned into their equivalent uniaxial values) and they have been compared to the ones derived from the conventional tests, confirming the potential of this testing technique and its accuracy for the extrapolation of times to rupture in creep conditions.
Using this method, the time needed to rupture a single bond can be measured as a function of the force that is required to maintain the complex in a stretched condition.
Cumulative damage fraction is evaluated by linear life fraction rule with time-to-rupture correlation of advanced austenitic stainless steel.
The composites possess approximately one order of magnitude lower steady-state creep rate and about eight times higher time-to-rupture at 873 K/200 MPa.
The conventional martensitic steel P92 shows a significant drop in creep strength accompanied by reduced necking and a change from ductile to brittle fracture when tested in Pb at 75 MPa (time-to-rupture tR = 13,090 h).
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