SYMPOSIA PAPER Published: 01 January 1986
STP17390S

Effect of Loading Rate on Dynamic Fracture of Reaction Bonded Silicon Nitride

Source

Wedge-loaded, modified tapered double cantilever beam (WL-MTDCB) specimens under impact loading were used to determine the room temperature dynamic fracture response of reaction bonded silicon nitride (RBSN). The crack extension history, with the exception of the terminal phase, was similar to that obtained under static loading. Like its static counterpart, a distinct crack acceleration phase, which was not observed in dynamic fracture of steel and brittle polymers, was noted. Unlike its static counterpart, the crack continued to propagate at nearly its terminal velocity under a low dynamic stress intensity factor during the terminal phase of crack propagation. These and previously obtained results for glass and RBSN show that dynamic crack arrest under a positive dynamic stress intensity factor is unlikely in static and impact loaded structural ceramics.

Author Information

Liaw, BM
University of Washington, Seattle, WA
Kobayashi, AS
University of Washington, Seattle, WA
Emery, AF
University of Washington, Seattle, WA
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Details
Developed by Committee: E08
Pages: 95–107
DOI: 10.1520/STP17390S
ISBN-EB: 978-0-8031-4972-4
ISBN-13: 978-0-8031-0472-3