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Ductile Fracture during Tensile Hopkinson Bar and Plate Impact Testing

Duktilbruchverhalten bei Tensile-Hopkinson-Bar- und Planar-Impakt-Tests
 
: Worswick, M.J.; Nahme, H.; Clark, J.; Fowler, J.

DYMAT '93. 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading. Proceedings
Ispra, 1993
S.8.1
International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading <8, 1993, Ispra>
Englisch
Konferenzbeitrag
Fraunhofer EMI ()
brass; Bruchmechanik; Bruchverhalten; dynamische Elastizitätsgrenze; fracture behaviour; fracture mechanics; Hugoniot elastic limit; LS-SYNA2D-Code; Messing; numerical simulation; numerische Simulation; Planar-Impakt; planar plate impact; Spallation; VISAR

Abstract
The process of ductile fracture through void nucleation, growth and coalescence under strain rates in the range 1000 - 10000 1/s is studied. The material considered is UNS C36000 free cutting brass containing spheroidal lead particles which serve as void nucleation sites. Tensile Split Hopkinson Bar and Plate Impact tests have been performed to examine stress-strain and fracture behaviour under high rate loading conditions. This paper presents results from the mechanical testing and metallographic observations of damage within tested samples. Measured damage and spall strengths are compared with predictions using LS-DYNA2D calculations employing a Gurson-based constitutive model. The model is shown to provide good predictions of spall strength but is thought to over-predict void growth rates.

: http://publica.fraunhofer.de/dokumente/PX-10270.html