Modeling of dynamic failure by nucleation and growth processes

Hanim, Said Ahzi

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

It is well established that high rate failure of structural materials takes place by rate processes occurring at the micro level and involving nucleation, growth, and coalescence of voids or cracks. At the submicroscopic level, the mechanism of failure in materials is dislocation controlled. The process of deformation and failure can be described by plastic glide that involves the mechanism of dislocation pile-ups. A new physically based model describing these processes is proposed. The effects of inertia and rate sensitivity on the growth process, and porosity are examined. The model formulation is three-dimensional and is suitable for a general state of stress and strain. The model constants are calibrated through numerical simulations of one dimensional strain based plate impact experiments. To demonstrate the generality of model to predict spall under multiaxial loading conditions, an experimental configuration in which a flyer plate impacts the base of a solid right circular cone has been simulated. The computational modeling has been performed with thermomechanical coupling. The mechanical threshold stress plasticity model, the new proposed failure model, and the equation of heat conduction have been implemented in the finite element code Abaqus. Results from these simulations are presented and discussed in comparison with the experimental results. This shows the capability of the model in matching the experimentally observed spall patterns in the solid cone.

Original languageEnglish
Title of host publicationJournal De Physique. IV : JP
PublisherEditions de Physique
Pages829-834
Number of pages6
Volume10
Edition9
Publication statusPublished - 2000
Externally publishedYes
Event6th International Conference on Mechanical and Physical Behaviour of Materials Under Dynamic Loading - Krakow, Pol
Duration: 25 Sep 200029 Sep 2000

Other

Other6th International Conference on Mechanical and Physical Behaviour of Materials Under Dynamic Loading
CityKrakow, Pol
Period25/9/0029/9/00

Fingerprint

nucleation
circular cones
piles
plastic properties
conductive heat transfer
inertia
coalescing
voids
cones
plastics
cracks
simulation
porosity
formulations
thresholds
configurations

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Hanim, & Ahzi, S. (2000). Modeling of dynamic failure by nucleation and growth processes. In Journal De Physique. IV : JP (9 ed., Vol. 10, pp. 829-834). Editions de Physique.

Modeling of dynamic failure by nucleation and growth processes. / Hanim, ; Ahzi, Said.

Journal De Physique. IV : JP. Vol. 10 9. ed. Editions de Physique, 2000. p. 829-834.

Research output: Chapter in Book/Report/Conference proceedingChapter

Hanim, & Ahzi, S 2000, Modeling of dynamic failure by nucleation and growth processes. in Journal De Physique. IV : JP. 9 edn, vol. 10, Editions de Physique, pp. 829-834, 6th International Conference on Mechanical and Physical Behaviour of Materials Under Dynamic Loading, Krakow, Pol, 25/9/00.
Hanim , Ahzi S. Modeling of dynamic failure by nucleation and growth processes. In Journal De Physique. IV : JP. 9 ed. Vol. 10. Editions de Physique. 2000. p. 829-834
Hanim, ; Ahzi, Said. / Modeling of dynamic failure by nucleation and growth processes. Journal De Physique. IV : JP. Vol. 10 9. ed. Editions de Physique, 2000. pp. 829-834
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