Further study on the mechanism of cleavage fracture at low temperatures

Chen, J.H., Yan, C., & Sun, J. (1994) Further study on the mechanism of cleavage fracture at low temperatures. Acta Metallurgica et Materialia, 42(1), pp. 251-261.

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Abstract

On the basis of finite element analyses of stress and strain ahead of a precrack tip and metallographic observation, the RKR model for cleavage fracture was reviewed, and the following conclusions were made: the critical event for cleavage fracture of a precracked specimen of C-Mn steel, tested around - 100°C, is the propagation of a second phase particle-sized crack into the neighbouring ferrite grain; there is a minimum distance Xm~ n from the precrack tip to the initiation position of cleavage fracture. This Xm~n is not determined by the criterion of the principal stress Oyy exceeding the cleavage stress trf, or the probability assuring the presence of an "eligible" cracked particle for which the criterion is satisfied. The Xm~ n has a definite physical meaning at which triaxiality %/6 reaches the critical value Tc, to prevent a produced crack nucleus from blunting. From the Xmi n and the measured cleavage stress af, the lower boundary value of K~c in the lower shelf of the transition curve could be calculated. A physical model for the statistical description of the scattering of the measured value of K~ c from its lower boundary value is suggested.

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ID Code: 98486
Item Type: Journal Article
Refereed: Yes
Keywords: steel, fracture mechanics, mechanical behaviour, brittle fracture
DOI: 10.1016/0956-7151(94)90067-1
ISSN: 0956-7151
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Metals and Alloy Materials (091207)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 29 Aug 2016 23:05
Last Modified: 29 Aug 2016 23:05

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