Damage and Fracture Mechanics pp 219-225 | Cite as
Spall Fracture in ARMCO Iron: Structure Evolution and Spall Strength
Abstract
The experimental study of material responses in a wide range of loading rate reveals some insight into dynamic failure and shows the linkage of solid behavior with the evolution of mesoscopic defects such as microcracks and microshears. This situation is strongly connected to dynamic and shock wave loading, when the time for mesodefect evolution, across different length-scales approaches the characteristic loading times. Taking into account the nature of plastic deformation and failure the key problems are related to the statistics and thermodynamics of the mesoscopic defects. This is revealed in the features of non-equilibrium systems with “slow dynamics”. “Slow dynamics” is the consequence of collective interactions between mesodefect modes with slow spatial-temporal response in comparison to the acoustic properties of the material (elastic wave propagation). The existence of these slow modes dominates the failure in dynamically loaded and shocked materials. The original study was conducted to support theoretical results and constitutive relations, which describe a different scenario of damage-failure transition with a self-organized criticality in mesodefect behavior — the structural-scaling transition.
Keywords
Dynamic Fracture Plate Impact Spalling Mesodefect Self-SimilarityPreview
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References
- [1]O.B. Naimark. Defect induced transitions as mechanisms of plasticity and failure in multifield continua (review paper). In Advances in Multifield Theories of Continua with Substructure, Birkhauser Boston, Inc., Eds: G. Capriz, P. Mariano, 2003, pp. 75–114.Google Scholar
- [2]O.B. Naimark. Collective properties of mesodefect ensembles and some nonlinear problems of plasticity and failure. Physical Mesomechanics, 2003, v. 6, pp. 45–72.Google Scholar
- [3]O.B. Naimark, S.V. Uvarov. Nonlinear crack dynamics and scaling aspects of fracture (experimental and theoretical study). International Journal of Fracture, 2004, v. 128, n. 1, pp. 285–292.MATHCrossRefGoogle Scholar
- [4]O.B. Naimark, S.V. Uvarov, D.D. Radford et al. The failure front in silica glasses, In Fifth International Symposium on Behaviour of Dense Media Under High Dynamic Pressures, Proceedings of the International Conference, Saint Malo, France, 2003, v. 2, pp. 65–74.Google Scholar
- [5]O.A. Plekhov, D.N. Eremeev and O.B. Naimark. Failure wave as resonance excitation of collective burst modes of defects in shocked brittle materials. Journal of Physique IV Colloq C., 2000, v. 10, pp. 811–816.Google Scholar