NDLI: Mechanical and Damage Fields Ahead of a Stationary Crack in a Creeping Solid

Content Provider	Springer Nature Link
Author	Sithickbasha, A. Abubakker Mahesh, Sivasambu
Copyright Year	2016
Abstract	The evolution of mechanical and damage fields, and the time to failure of material points ahead of a stationary crack in a compact tension specimen are computed using finite element simulations for a linear elastic/power law creeping material. These are compared with predictions obtained from fields based on two fracture mechanics based load-parameters: the steady-state $$C^*$$ , and the time-corrected C(t). The finite element calculations predict opening stresses in the crack plane that are non-monotonic in the time interval $$0 \le t \le t_1$$ , where $$t_1$$ denotes the time to transition from small-scale creep to extensive creep. This is in contradiction to the monotonic ‘self-similar’ decay of stress with time given by the C(t) field. Consequently, damage rates and times to failure of material points ahead of a crack are calculated using the finite element stress-field, and the C(t)-based stress-field diverge considerably. These observations suggest that the creep damage rates derived on the basis of self-similarly decaying opening stress fields may be severely inaccurate.
Starting Page	217
Ending Page	224
Page Count	8
File Format	PDF
ISSN	09722815
Journal	Transactions of the Indian Institute of Metals
Volume Number	70
Issue Number	1
e-ISSN	09751645
Language	English
Publisher	Springer India
Publisher Date	2016-05-17
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fracture mechanics Creep crack $$C^*$$ -field Continuum damage Metallic Materials Materials Science Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys

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