Transients in elevated temperature crack growth. [1 Cr-1Mo-0. 25V]
Transients which affect the crack growth behavior of metals at elevated temperature under cyclic and static loading are classified as (1) deformation transients which are present due to the relaxing crack tip stress fields during small scale creep and (2) damage or crack growth transients which are present during the period in which a steady-state damage state evolves at the crack tip starting from an initially undamaged state. It is shown using extensive amounts of creep and creep-fatigue crack growth data on 1Cr-1Mo-0.25V steel that deformation transients under static as well as cyclic loading are completely normalized by the C/sub t/ parameter. It is also shown that the other crack tip parameters such as K, C* and C(t) are unable to normalize the influence of deformation transients. However, C/sub t/ fails to uniquely characterize the crack growth rate during the damage or crack growth transient.
- Research Organization:
- Georgia Inst. of Tech., Atlanta (USA). Fracture and Fatigue Research Lab.
- DOE Contract Number:
- FG05-86ER45257
- OSTI ID:
- 6187384
- Report Number(s):
- DOE/ER/45257-2; CONF-8710123-1; ON: DE87013189
- Resource Relation:
- Conference: International seminar on high temperature fracture mechanisms and mechanics, Dourdan, France, 13 Oct 1987; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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