On the origin of microcracking behind a crack tip

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Department of Materials Science and Engineering


Calculations based on both linear elasticity and small scale yielding in an elastic-plastic body indicate that large normal stresses exist behind the tip of the main crack and are related to the presence of microcracks which intersect a fracture surface. This concept is applied to the specific case of microcracks which intersect a mixed mode I/II fatigue crack in Ti-40 at. pct V alloy single crystals. The microcracks, which occur on {110} and {111} planes, are associated with the radial distribution of stresses normal to the observed microcrack plane. In the Ti-40V alloy examined, microcracking may occur by cleavage on rarely observed {110} and {111} planes because of the combination of large normal stresses and flow at the microcrack tip which is controlled by the stress field imposed by the main crack.

Publisher's Statement

© 1978 American Society for Metals and The Metallurgical Society of Aime. Publisher’s version of record: https://doi.org/10.1007/BF02649793

Publication Title

Metallurgical Transactions A