Dynamic crack de ( ection and penetration at interfaces in homogeneous materials : experimental studies and model predictions

We examine the de(ection/penetration behavior of dynamic mode-I cracks propagating at various speeds towards inclined weak planes/interfaces of various strengths in otherwise homogeneous isotropic plates. A dynamic wedge-loading mechanism is used to control the incoming crack speeds, and high-speed photography and dynamic photoelasticity are used to observe, in real-time, the failure mode transition mechanism at the interfaces. Simple dynamic fracture mechanics concepts used in conjunction with a postulated energy criterion are applied to examine the crack de(ection/penetration behavior and, for the case of interfacial de(ection, to predict the crack tip speed of the de(ected crack. It is found that if the interfacial angle and strength are such as to trap an incident dynamic mode-I crack within the interface, a failure mode transition occurs. This transition is characterized by a distinct, observable and predicted speed jump as well as a dramatic crack speed increase as the crack transitions from a purely mode-I crack to an unstable mixed-mode interfacial crack. ? 2003 Elsevier Science Ltd. All rights reserved.

[1]  Zhigang Suo,et al.  Crack Deflection at an Interface Between Two Orthotopic Media , 1992 .

[2]  W. Knauss,et al.  A reconciliation of dynamic crack velocity and Rayleigh wave speed in isotropic brittle solids , 1994, International Journal of Fracture.

[3]  S. Mall,et al.  Dynamic fracture toughness of Homalite-100 , 1978 .

[4]  J. E. Gordon,et al.  A mechanism for the control of crack propagation in all-brittle systems , 1964, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[5]  Huajian Gao,et al.  On radiation-free transonic motion of cracks and dislocations , 1999 .

[6]  N. Fleck,et al.  Dynamic crack growth across an interface , 1997 .

[7]  D. P..  A reconciliation of dynamic crack velocity and Rayleigh wave speed in isotropic brittle solids , 2004 .

[8]  Q. Qin,et al.  Crack deflection at an interface between dissimilar piezoelectric materials , 2000 .

[9]  Jay Fineberg,et al.  Confirming the continuum theory of dynamic brittle fracture for fast cracks , 1999, Nature.

[10]  Eric Martin,et al.  Interface debonding ahead of a primary crack , 2000 .

[11]  V. Gupta,et al.  Energy criterion for crack deflection at an interface between two orthotropic media , 1994 .

[12]  K. Broberg.  Cracks and Fracture , 1999 .

[13]  John W. Hutchinson,et al.  Crack deflection at an interface between dissimilar elastic-materials , 1989 .

[14]  M. He,et al.  Deflection versus penetration of a wedge-loaded crack: effects of branch-crack length and penetrated-layer width , 2000 .

[15]  W. Knauss,et al.  Dynamic crack propagation along a weakly bonded plane in a polymer , 1989 .

[16]  Philippe H. Geubelle,et al.  Intersonic crack propagation in homogeneous media under shear-dominated loading: Theoretical analysis , 2001 .

[17]  Gao Huajian,et al.  Slightly curved or kinked cracks in anisotropic elastic solids , 1992 .

[18]  Ares J. Rosakis,et al.  Impact failure characteristics in sandwich structures. Part II: Effects of impact speed and interfacial strength , 2002 .

[19]  K. W. Neale,et al.  Dynamic fracture mechanics , 1991 .

[20]  Arun Shukla,et al.  Intersonic crack propagation in bimaterial systems , 1998 .

[21]  W. Curtin,et al.  Criteria for crack deflection/penetration criteria for fiber-reinforced ceramic matrix composites , 1998 .

[22]  J. Dally.  Dynamic photoelastic studies of fracture , 1979 .

[23]  Ares J. Rosakis,et al.  The effect of bond strength and loading rate on the conditions governing the attainment of intersonic crack growth along interfaces , 1999 .

[24]  Ares J. Rosakis,et al.  An experimental study of impact-induced failure events in homogeneous layered materials using dynamic photoelasticity and high-speed photography , 2003 .

[25]  Z. Suo,et al.  Mixed mode cracking in layered materials , 1991 .

[26]  John Lambros,et al.  SHEAR DOMINATED TRANSONIC INTERFACIAL CRACK GROWTH IN A BIMATERIAL-I. EXPERIMENTAL OBSERVATIONS , 1995 .

[27]  Ares J. Rosakis,et al.  Dynamic full field measurements of crack tip temperatures , 2001 .

[28]  Ares J. Rosakis,et al.  Dynamic failure mechanics , 2000 .

[29]  R. J. Sanford,et al.  Dynamic Crack Growth in Polymers , 1983 .

[30]  K. Ravi-Chandar,et al.  An experimental investigation into dynamic fracture: III. On steady-state crack propagation and crack branching , 1984 .

[31]  M. Thouless.  Mixed-mode fracture of a lubricated interface , 1992 .

[32]  G. T. Hahn,et al.  Fast Fracture Toughness and Crack Arrest Toughness of Reactor Pressure Vessel Steel , 1980 .

[33]  A. Rosakis,et al.  Cracks faster than the shear wave speed , 1999, Science.

[34]  J. K. Dienes,et al.  A Unified Theory of Flow, Hot Spots, and Fragmentation with an Application to Explosive Sensitivity , 1996 .

[35]  A. Needleman,et al.  Microcrack nucleation and growth in elastic lamellar solids , 2000 .