Abstract
The Mode II crack flank displacement and crack growth responses of three precracked specimens made from structural steel were measured, using plastic replicas and a crack-tip compliance gage. Crack surface interaction was found to dominate behavior: at low stress intensity range (KIInom = 9 MPa m) the precracks did not suffer reversed slip to their tips and no crack growth occurred, while at high stress intensity range (KIInom = 19 MPa m) the effective stress intensity range was less than half that nominally applied. Three sources of crack flank frictional attenuation were identified: compressive residual stresses due to precracking, Mode I wedging over asperities, and gross plastic deformation of interlocking asperities. The measured unlocking response was modeled successfully by assuming that crack flank frictional stresses obeyed a constant interfacial shear stress friction law. Keywords: fatigue crack growth, Mode II, shear mode, steels, crack flank locking, crack flank slip, friction
| Original language | English |
|---|---|
| Pages (from-to) | 260-280 |
| Number of pages | 20 |
| Journal | ATW - International Journal for Nuclear Power |
| Volume | 1 |
| Issue number | 0 |
| Publication status | Published - 1988 |