Abstract
D islocation-crack interaction studies have led to the development of criteria for fracture in terms of dislocation emission from crack edges, and to consideration of crack edge shielding effects due to dislocations. These studies have generally been quasi-static. To illustrate, therefore, the extension of the basic concepts involved to dynamic situations, three exact analytical results are presented. These involve screw dislocation motion near a crack which may be growing, and which may be subjected to dynamic loading due to SH-wave diffraction. Study of these results allows some useful insights. In particular, fracture initiation and dislocation emission times and, thus, their order of occurrence, can be determined. Moreover, it is shown that crack edge shielding can be temporary, and that parameters such as the dislocation force and the distance traveled by an emitted dislocation prior to arrest can have pronounced dynamic overshoot effects. Finally, it is found that this arrest distance depends only implicitly upon the applied loading.
Published Version
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