SYMPOSIA PAPER Published: 01 January 1977
STP27387S

Measurements of Dynamic Stress Intensity Factors for Fast Running and Arresting Cracks in Double-Cantilever-Beam Specimens

Source

The influence of dynamic effects on the crack arrest process is investigated. For propagating and subsequently arresting cracks, actual dynamic stress intensity factors were measured applying a shadow optical technique in combination with a Cranz Schardin high-speed camera. The experiments were performed in wedge-loaded double-cantilever-beam (DCB) specimens machined from an epoxy resin (Araldite B). In the initial phase of crack propagation the measured dynamic stress intensity factors were found smaller; in the arresting phase, however, they were larger than the corresponding static values. After arrest the dynamic stress intensity factor oscillates with decreasing amplitude around the static stress intensity factor at arrest. Crack arrest toughness values determined according to a static analysis showed a dependence on the crack velocity prior to arrest, but the dynamic crack arrest toughness yielded a single value only, indicating that this quantity represents a true material property.

Author Information

Kalthoff, JF
Institut für Festkörpermechanik der Fraunhofer-Gesellschaft, Freiburg, Germany
Beinert, J
Institut für Festkörpermechanik der Fraunhofer-Gesellschaft, Freiburg, Germany
Winkler, S
Institut für Festkörpermechanik der Fraunhofer-Gesellschaft, Freiburg, Germany
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Details
Developed by Committee: E08
Pages: 161–176
DOI: 10.1520/STP27387S
ISBN-EB: 978-0-8031-4700-3
ISBN-13: 978-0-8031-0341-2