Abstract
We analyze the initiation and propagation of a crack from a point on the surface of a circular notch-tip in an impact loaded prenotched plate. The material of the plate is assumed to exhibit strain hardening, strain-rate hardening, and softening due to the rise in temperature and porosity. The degradation of material parameters due to the evolution of damage in the form of porosity is considered. Brittle failure is assumed to initiate when the maximum tensile principal stress at a point reaches a critical level. Ductile failure is assumed to ensue when the effective plastic strain reaches a critical value. A crack initiating from the node where a failure first occurs is taken to propagate to the adjacent node that has the highest value of the failure parameter (the maximum tensile principal stress or the effective plastic strain). The opening and propagation of a crack are modeled by the node release technique. Surface tractions and the normal component of the heat flux are taken to be null on the newly created crack surfaces. For the brittle failure, the stress field around the crack tip resembles that in mode-I deformations of a prenotched plate loaded in tension. The distribution of the effective plastic strain in a small region around the surface of the notch-tip is not affected much by the initiation of a ductile fracture there except for a shift in the location of the point where the effective plastic strain is maximum. The initiation of the ductile failure is delayed when a crack is opened at the point where the brittle failure ensues.
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References
Batra, R.C. (1975). On heat conduction and wave propagation in non-simple rigid solids. Letters in Applied and Engineering Science 3, 97–107.
Batra, R.C. (1987). The initiation and growth of, and the interaction among adiabatic shear bands in simple and dipolar materials. International Journal of Plasticity 3, 75–89.
Batra, R.C. and Hwang J. (1994). Dynamic shear band development in dipolar thermoviscoplastic materials. Computational Mechanics 12, 354–369.
Batra, R.C. and Jin, X.S. (1994). Analysis of dynamic shear bands in porous thermally softening viscoplastic materials. Archives of Mechanics 46, 13–36.
Batra, R.C. and Kim, C.H. (1992). Analysis of shear bands in twelve materials. International Journal of Plasticity 8, 425–452.
Batra, R.C. and Nechitailo N.V. (1997). Analysis of failure modes in impulsively loaded pre-notched plates. International Journal of Plasticity 13, 291–308.
Batra, R.C. and Gummalla, R.R. (2000). Effect of material and geometric parameters on deformations near the notch-tip of a dynamically loaded prenotched plate. International Journal of Fracture 101, 99–140.
Batra, R.C. and Ravisankar, M.V.S. (2000). Three-dimensional numerical simulation of the Kalthoff experiment. International Journal of Fracture 105, 161–186.
Batra, R.C. and Jaber, N.A. (2001). Failure mode transition in an impact loaded pre-notched plate with four thermoviscoplastic relations. International Journal of Fracture 110, 47–71.
Batra, R.C., Jaber, N.A. and Malsbury, M.E. (2003). Analysis of failure modes in an impact loaded thermoviscoplastic prenotched plate. International Journal of Plasticity 19, 139–196.
Batra, R.C. and Chen L. (2001). Effect of viscoplastic relations on the instability strain, shear band initiation strain, the strain corresponding to the maximum shear band spacing, and the band width in a thermoviscoplastic material. International Journal of Plasticity 17, 1465–1489.
Batra, R.C. and Chen, L. (2001). Instability analysis and shear band spacing in gradient-dependent thermoviscoplastic materials with finite speeds of thermal waves. Archives of Mechanics 53, 167–192.
Batra, R.C. and Ching, H.-K. (2002). Analysis of elastodynamic deformations near a crack-notch tip by the meshless local Petrov-Galerkin (MLPG) method. Computer Modeling in Engineering and Sciences 3, 717–730.
Batra, R.C. and Kim, K.H. (1990). Effect of viscoplastic flow rules on the initiation and growth of shear bands at high strain rates. journal of Mechanics Physics and Solids 38, 859–874.
Batra, R.C. and Rattazzi, D. (1997). Adiabatic shear banding in a thick-walled steel tube. Computed Mechanics 20, 412–426.
Batra, R.C. and Lear, M.H. Adiabatic Shear Banding in Plane Strain Tensile Deformations of Thermoviscoplastic Materials with Finite Thermal Wave Speed, submitted for publication.
Cattaneo, C. (1958). A form of heat equation which eliminates the paradox of instantaneous propagation. CR Acad. Sci. 247, 431–433.
Chester, M. (1963). Second sound in solids. Phys. Rev. 131, 2103–2105.
Ching, H.-K. and Batra, R.C. (2001). Determination of crack tip fields in linear elastostatics by the meshless local Petrov-Galerkin (MLPG) Method. Computer Modeling in Engineering and Sciences 2, 273–289.
Chu, C. and Needleman A. (1980). Void nucleation effects in biaxially stretched sheets. Journal of Engineering Material and Technics 102.
Curran, D.R., Seaman, L. and Shockey, D.A. (1987). Dynamic failure of solids. Physics Reports 147, 253–388.
Gurson, A.L. (1977). Continuum theory of ductile rupture by void nucleation and growth: Part I. Journal of Engineering Materials and Technics 99, 2–15.
Hendrickson, J.A., Wood, D.S. and Clark, D.C. (1958). The initiation of brittle fracture in mild steel. Journal of the Mechanics and Physics of Solids 50, 656–681.
Jiang, B. and Batra, R.C. (2002). Effective properties of a piezocomposite containing shape memory alloy and inert inclusions. Continuum Mech. Thermodynamics 14, 87–111.
Johnson, G.R. and Cook, W.H. (1983). A constitutive model and data for metals subjected to large strains, high strain-rates, and high temperatures. Proc. 7th International Symp. on Ballistics, The Hague, The Netherlands, 541–548.
Kalthoff, J.F. (1987). Shadow optical analysis of dynamic shear failure, SPIE, photomechanics and speckle. Metrology 814, 531–538.
Kalthoff, J.F. (2000). Modes of dynamic shear failure in solids. International Journal of Fracture 101, 1–31.
Kalthoff, J.F. and Winkler, S. (1987). Failure mode transition at high rates of shear loading. Impact Loading and Dynamic Behavior of Materials 1, 185–195.
Needleman A. (1987). A continuum model for void nucleation by inclusion debonding. Journal of Applied Mechanics 54, 525–531.
Needleman, A. and Tvergaard, V. (1995). Analysis of a brittle-ductile transition under dynamic shear loading. International Journal of Solids Structures 32, 2571–2590.
Needleman, A. and Tvergaard, V. (2000). Numerical modeling of the ductile-brittle transition. International Journal of Fracture 101, 73–97. (2000)
Perzyna, P. (1998). Constitutive Modeling of Dissipative Solids for Localization and Fracture. In: Localization and Fracture Phenomenon in Inelastic Solids, (edited by P. Perzyna). pp. 99–242, Springer, Berlin.
Ravi-chandar, K., Lu, J., Yang, B. and Zhu, Z. (2000). Failure mode transitions in polymers under high strain rate loading. International Journal of Fracture 101, 33–72.
Ritchie, R.O., Knott, J.F. and Rice, J.R. (1973). On the relationship between critical tensile stress and fracture toughness in mild steel. Journal of Mechanical Physics and Solids 21, 395–410.
Rousselier, G. (1987). Ductile fracture models and their potential in local approach to fracture. Nuclear Engineering and Design 105, 97–111.
Wang, Z.P. and Jiang, Q. (1997). A yield criterion for porous ductile media at high strain rate. Journal of Applied Mechanics 64, 503–509.
Wang, Z.P. (1997). Void-containing nonlinear materials subjected to high-rate loading. Journal of Applied Physics 81, 7213–7227.
Zhou, M., Ravichandran, G. and Rosakis, A. (1996a). Dynamically propagating shear bands in impact-loaded prenotched plates-I. Journal of the Mechanics and Physics of Solids 44, 981–1006.
Zhou, M., Ravichandran, G. and Rosakis A. (1996b). Dynamically propagating shear bands in impact-loaded prenotched plates-II. Journal of the Mechanics and Physics of Solids 44, 1007–1032.
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Batra, R., Lear, M. Simulation of brittle and ductile fracture in an impact loaded prenotched plate. International Journal of Fracture 126, 179–203 (2004). https://doi.org/10.1023/B:FRAC.0000026364.13365.71
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DOI: https://doi.org/10.1023/B:FRAC.0000026364.13365.71