Finite element simulation of ring expansion and fragmentation: The capturing of length and time scales through cohesive models of fracture

  • A. Pandolfi
  • P. Krysl
  • M. Ortiz
Chapter

Abstract

The expanding ring test of Grady and Benson (1983) is taken as a convenient yet challenging validation problem for assessing the fidelity of cohesive models in situations involving ductile dynamical fracture. Attention has been restricted to 1100–0 aluminum samples. Fracture has been modelled by recourse to an irreversible cohesive law embedded into cohesive elements. The finite element model is three-dimensional and fully Lagrangian. In order to limit the extent of deformation-induced distortion, we resort to continuous adaptive remeshing. The cohesive behavior of the material is assumed to be rate independent and, consequently, all rate effects predicted by the calculations are due to inertia and the rate dependency in plastic deformation. The numerical simulations are revealed to be highly predictive of a number of observed features, including: the number of dominant and arrested necks; the fragmentation patterns; the dependence of the number of fragments and the fracture strain on the expansion speed; and the distribution of fragment sizes at fixed expansion speed.

Keywords

High Strain Rate Fracture Strain Expansion Velocity Cohesive Element Initial Imperfection 
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.
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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • A. Pandolfi
    • 1
  • P. Krysl
    • 2
  • M. Ortiz
    • 2
  1. 1.Dipartimento di Ingegneria StrutturalePolitecnico di MilanoMilanoItaly
  2. 2.Graduate Aeronautical LaboratoriesCalifornia Institute of TechnologyPasadenaUSA

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