This is not just another book on fracture mechanics. In recent
years, there have been many books published on this subject in an
attempt to assess the state of the art and its applications. The
majority of the work dealt with energy release rate or critical
stress intensity factor and is applicable only to fracture
toughness testing. The main reason for this restriction is that the
energy release concept cannot easily be extended to mixed mode
fracture that occurs in practice as the rule rather than the
exception. Cracks will normally curve or turn because the direction
of loading can change as a function of time. Their directions of
growth cannot be assumed as an a priori and must be determined from
a pre-assumed criterion. Analysts are still perplexed with
selecting an appropriate fracture criterion because it requires
much discernment and judgement. Criteria which often appeared valid
for idealized situations are quickly dis credited when encountering
more complex physical phenomena. Moreover, the claim of generality
cannot be justified on the basis of agreement between theory and
experiment for a few simple examples."
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