Deformation rates effects in softwoods: Crack dynamics with lattice fracture modelling (Articolo in rivista)

Type
Label
  • Deformation rates effects in softwoods: Crack dynamics with lattice fracture modelling (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.engfracmech.2009.01.019 (literal)
Alternative label
  • Vasic S., Ceccotti A., Smith I., Sandak J. (2009)
    Deformation rates effects in softwoods: Crack dynamics with lattice fracture modelling
    in Engineering fracture mechanics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Vasic S., Ceccotti A., Smith I., Sandak J. (literal)
Pagina inizio
  • 1231 (literal)
Pagina fine
  • 1246 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 76 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 9 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Vasic S.: Institute for Materials Testing IMS, Bulevar vojvode Misica 43, Belgrade, Serbia, IVALSA/CNR, Trento, Italy; Smith I.: Faculty of Forestry and Environmental Management, University of New Brunswick, P.O. Box 44555, Fredericton, NB, Canada. (literal)
Titolo
  • Deformation rates effects in softwoods: Crack dynamics with lattice fracture modelling (literal)
Abstract
  • Present study contributes towards understanding crack toughness against the intrinsic deformation rate sensitivity. A methodology for characterizing fracture dependence in softwoods through experimental and numerical analysis has been developed. Time-dependence was found to be the characterising parameter. Image analysis of fracture data acquired with high-speed camera showed that the crack speed histories are stochastic and erratic. In the higher rate range, crack dynamics is characterized as episodic and locally heterogeneous, with irregular jumps and arrests. Critical crack propagation speed at the highest rate tested of 200 mm/min was found to be between 0.7 m/s and 4 m/s (14.3 km/h). Fracture toughness decreased at both slow static and high loading rates, with the mean maximum at 1 mm/min, which is a static deformation rate specific to short-term standard tests. At 200 mm/min deformation rate, inertial effects suggested dynamic fracture response. Explanations of loading rates effects relate to the micro-processes in the fracture process zone (FPZ) and fracture mechanisms, which are simulated with discrete lattice fracture model (LFM). The model included viscous bi-linear stress relaxation into the softening relation and random stochastic finite element properties. Novel characterisation of softwoods is crucial for sensible numerical modeling in seismic structural situations. (literal)
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