On the growth of shear bands and failure-mode transition in prenotched plates: A comparison of singly and doubly notched specimens
Recent studies of the initiation and propagation of shear bands using doubly or singly notched plates loaded asymmetrically have yielded valuable insight into this phenomenon. The same experiments also demonstrated that the shear banding mode of failure and a more brittle, "fracture", mode of failure can coexist in the impact-loaded specimens and transitions between the two modes were documented. However, different investigators have reported significantly different types of failure mode transitions. Due to the slightly different experimental configurations used in the studies, direct comparisons could not be made to analyze the causes of the different results. This investigation focuses on isolating the cause of this discrepancy by conducting experiments on the same material using both configurations simultaneously. The results suggest that the different types of failure mode transitions are caused by the different material properties used in the studies and the difference in specimen geometry does not seem to be primarily responsible for the differing behaviors.
© 1998 Published by Elsevier Science Ltd. Received in final revised form 10 November 1997. The authors gratefully acknowledge support from the Army Research Office through grant No. DAAH 04-93-G0037 under Dr K. Iyer. We are also grateful to Dr Y. Rajapakse for support from the Office of Naval Research through grant No. N00014-90-J-1340. The computations were carried out on a Cray C98 computer at the Goddard Space Center and a Cray Y-MP2E/232 computer at the Jet Propulsion Laboratory.