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International Journal of Fracture

, Volume 22, Issue 3, pp 217–229 | Cite as

Evaluation of dynamic crack instability criteria

  • D. A. Shockey
  • J. F. Kalthoff
  • D. C. Erlich
Article

Abstract

Previously proposed dynamic crack instability criteria are reviewed. The conditions of crack length, pulse amplitude, and pulse duration predicted by each criterion for crack instability under stress wave loads are presented and compared. To discriminate among these criteria, a data base was generated by performing plate impact experiments on epoxy specimens embedded with thin circular disks that acted as internal penny-shaped cracks. The observed instability behavior of these cracks under 2-µs stress pulses of various amplitudes was best described by a criterion that requires the dynamic stress intensity to exceed the dynamic fracture toughness for a certain minimum time.

Keywords

Fracture Toughness Stress Wave Dynamic Stress Dynamic Fracture Wave Load 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

On passe en revue les critères d'instabilité de fissures dynamiques proposées jusqu'à présent. On présente et on compare les conditions de longueur de fissure, d'amplitude de pulsation et de durée de pulsation prédites par chaque critère en vue de décrire l'instabilité des fissures sous des mises en charge ondulées. Pour établir une discrimination entre les critères, on a construit une base de données en procédant à des essais d'impact sur des plaques éprouvettes en Epoxy dans lesquelles de minces disques circulaires étaient noyés en vue de représenter des fissures internes en forme d'ongle. Le comportement instable observé pour cette fissure sous des contraintes pulsées inférieures à 2 µs et d'amplitude variable a été le mieux décrit par un critère qui requiert que l'intensité de contrainte dynamique excède la ténacité à la rupture dynamique durant un certain temps minimum.

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Copyright information

© Martinus Nijhoff Publishers 1983

Authors and Affiliations

  • D. A. Shockey
    • 1
  • J. F. Kalthoff
    • 1
    • 2
  • D. C. Erlich
    • 1
  1. 1.Department of Metallurgy and Fracture MechanicsSRI InternationalMenlo ParkUSA
  2. 2.Fraunhofer-Institut für WerkstoffmechanikFreiburgWest Germany

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