Elevated temperature fatigue crack growth behavior of Ti-1100

Parida, BK and Nicholas, T (1994) Elevated temperature fatigue crack growth behavior of Ti-1100. Fatiue Fracture Engineering Materials Structures, 17 (5). pp. 551-561.

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Abstract

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 asperty-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 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 .

Item Type:	Journal Article
Additional Information:	Copyright for this article belongs to Fatigue and Fracture of Engineering Materials and Structures Ltd.,
Uncontrolled Keywords:	Temperature fatigue;Crack growth behavior;Ti-1100;Titanium alloy
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials
Division/Department:	Structural Integrity Division, Other
Depositing User:	Deputy Head Poornima Narayana
Date Deposited:	08 Feb 2008
Last Modified:	24 May 2010 09:44
URI:	http://nal-ir.nal.res.in/id/eprint/1948

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