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Constitutive modeling of fracture waves

Resnyansky, A. D. ; Romensky, E. I. ; Bourne, N. K.

Journal of Applied Physics, 01 February 2003, Vol.93(3), pp.1537-1545 [Periódico revisado por pares]

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  • Título:
    Constitutive modeling of fracture waves
  • Autor: Resnyansky, A. D. ; Romensky, E. I. ; Bourne, N. K.
  • Assuntos: Structural, Mechanical Thermodynamic, And Optical Properties Of Condensed Matter
  • É parte de: Journal of Applied Physics, 01 February 2003, Vol.93(3), pp.1537-1545
  • Descrição: A fracture wave (FW) in a brittle material is a narrow transition region (border) of a continuous fracture zone, which may be associated with the damage accumulation process initiated by propagation of shock waves. In multidimensional structures the fracture wave may behave in an unusual way. The high-speed photography of penetration of a borosilicate (Pyrex) glass block [N. K. Bourne, L. Forde, and J. E. Field, Proc. SPIE 2869 , 626 (1997)] shows a visible fracture zone with an apparent flat front although the projectile is a hemispherically nosed rod. A strain-rate-sensitive model is being developed and employed for analysis of the role of the complex stress state and kinetic description of the damage accumulation to describe the process of the impact. Numerical analysis is conducted with a one-dimensional wave propagation code employing the model and with the LS-DYNA2D hydrocode in which the model has been implemented. The analysis demonstrates that (i) the second (plastic) shock wave is superseded by quicker FW relaxing stress behind the elastic precursor, and (ii) the FW front flattening is apparently caused by the change in the acoustic directional properties. This change is associated with the phase-like transition due to the damage accumulation within the FW. In particular, the FW transition separates a highly anisotropic zone of material characterized acoustically by longitudinal and shear waves in front of the FW from a nearly isotropic region of the material characterized only by bulk waves behind the FW.
  • Idioma: Inglês

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