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Crack Healing and Strength Recovery in UO 2
Author(s) -
BANDYOPADHYAY G.,
ROBERTS J. T. A.
Publication year - 1976
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1976.tb09508.x
Subject(s) - materials science , sintering , thermal shock , composite material , cracking , self healing , alternative medicine , pathology , medicine
The kinetics of the final stages of crack healing and strength recovery are formulated from a simple mechanistic point of view. Experimental verification is obtained from literature data and from healing data on notched UO 2 bars with small cracks introduced by local thermal shock at the notch. The analysis indicates that the initial strength recovery resulting from crack healing is apparently controlled by pinching off of the crack and by some sintering of crack‐like pores (termed stage 1 of healing). At a later stage, however, strength recovery is controlled only by the sintering of crack‐like pores through a diffusional process (termed stage 2). “Crack‐healing diagrams” that can be used to predict the stages of healing and the time required for complete strength recovery are developed from the experimental data. The information obtained from these diagrams can be used in the kinetic equation for stage 2 healing to estimate the strength recovery at that stage.