Abstract
An asymmetric configuration may arise if a crack is near a weld or shoulder. In this case, loading into the plastic range can give a single asymmetric shear band extending from the crack tip instead of the two shear zones of the symmetric case. The resulting crack propagation near the active slip band, into previously pre-strained material, may give less ductility than the typical symmetric case where the crack advances into relatively unstrained material between the two shear zones. An approximate solution for the growth of such asymmetric cracks in regions dominated by an HRR type strain singularity is presented. The effect of strain hardening on crack growth is investigated and the predicted growth rate is compared with test data on several alloys.
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