Elevated temperature fatigue crack growth behavior of Ti-1100
IR@NAL: CSIR-National Aerospace Laboratories, Bangalore
View Archive Info| Field | Value | |
| Title |
Elevated temperature fatigue crack growth behavior of Ti-1100
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| Creator |
Parida, BK
Nicholas, T |
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| Subject |
Aircraft Design, Testing & Performance
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| Description |
The fatigue crack growth behavior of Ti-1100 is analyzed at elevated temperatures to evaluate the effects of mechanical and environmental variables. Experiments conducted over a wide range of frequencies from 0.01 Hz to 200 Hz indicate a strong dependence of the growth rate upon cyclic loading frequency. Superposition of hold time at maximum and minimum loads over a baseline 1.0 Hz cyclic loading frequency produces an insignificant variation in crack growth rate, which may be attributed to the combined effects of enhanced environmental degradation, crack-tip blunting and increased asperity-induced closure level in this material. It is deduced that a hold time at maximum load results in an interaction of the environmental effects with a retardation effect due to a crack tip blunting as a consequence of creep under maximum applied load, whereas for hold at minimum loads, extensive crack-branching and micro-cracking appear to enhance crack closure loads resulting in lower crack growth rates. A linear superposition model is employed to account for the complex interactions due to fatigue, creep and environmental degradation.
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| Date |
1994
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| Type |
Journal Article
PeerReviewed |
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| Identifier |
Parida, BK and Nicholas, T (1994) Elevated temperature fatigue crack growth behavior of Ti-1100. Fatigue and Fracture of Engineering Materials and Structures, 17 (5). pp. 551-561.
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| Relation |
http://nal-ir.nal.res.in/338/
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