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https://doi.org/10.1016/s0013-7944(98)00086-1
Copy DOIJournal: Engineering Fracture Mechanics | Publication Date: Jan 1, 1999 |
Citations: 2 |
Elevated temperature tests were performed on titanium alloy 6-2222 (Ti 6-2222) sheet material to determine the creep deformation behavior and to evaluate the suitability of crack tip parameters for characterizing creep crack growth behavior in the temperature range of 350–450°C. At temperatures of 400°C and above, the material behaves essentially as a creep-ductile material in which the creep crack growth rate is characterized by the C t parameter. At 350°C, transition from creep-ductile to creep-brittle behavior was observed. A correlation which is independent of temperature for creep-ductile conditions in the range of 350–450°C between creep crack growth rate and C t is derived from these tests. The creep-brittle behavior observed at 350°C was in the transient range where no well-accepted crack tip parameter is available for characterizing the crack growth behavior. A methodology for predicting creep crack growth in Ti 6-2222 sheet structures at elevated temperature when creep-ductile behavior is observed is briefly discussed.
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