Propagation dynamic crack

The above refers primarily to linear elastic fracture mechanics (LEFM) studies related to the onset of brittle fracture as well as fatigue. The states of the sciences of ductile and dynamic fracture, which only became of serious concern in the early 1960s and 1970s, respectively, have not reached a similar level of maturity despite the immense research efforts expended on these topics in recent years. Yet to be resolved in the former is a viable ductile fracture criterion in view of the recently uncovered uncertainties regarding the /-integral as a crack tip parameter.5,6 As for the latter, a reliable dynamic crack propagation criterion is yet to be established, as will become apparent in subsequent sections of this chapter. 

T. Nishioka and S. N. Atluri, Numerical Analysis of Dynamic Crack Propagation Generation and Prediction Studies, Engineering Fracture Mechanics, 16[3], 303-332 (1982). 

Although much work has been done on the dynamic crack propagation in brittle materials for many years, the mechanism that governs the dynamics of a crack is not well understood [1,2]. Recently, the problems associated with the dynamic brittle fracture have attracted much attention in physics community. Fineberg, Gross, Marder and Swinney [3] performed a refined experiment of mode-I dynamic crack propagation in brittle material, PMMA (polymethyl-methacrylate). Improving the resolution of the crack velocity measurements, they have discovered the existence of a critical velocity, = 0.36c, beyond which the velocity of... 

The energy needed to start the crack is higher than the energy required for its development. Consequently, dynamic crack propagation in brittle fracture is most probably by the second mechanism. 

Studies of the dynamic crack propagation behaviour of commercial RTPMMA materials [52,53] showed that crack propagation occurred by a stick-slip process. The toughening was attributed to crack-tip blunting by shear yielding. Unfortunately, the use of thin bhmtly-notched specimens means that the stress state in the samples cannot be specified with certain. ... 

Sto Stocek, R., Heinrich, G., Gehde, M. The influence of die test properties oti dynamic crack propagation in filled mbbers by simultaneous tensile- and pure-shear-mode testing. In Heinrich, G. Kaliske, M., Lion, A., Reese, S. (eds.) Constitutive models for rubber VI. CRC Press, 2009, 345-352. 

Lor Lorenz, H., Steinhauser, D., Kliippel, M. Morphology and micro-mechanics of filled elastomer blends Impact on dynamic crack propagation. In Grellmann, W., Heinrich, G., Kaliske, M., Kliippel, M., Schneider, K., Vilgis, T. (eds.) Fracture mechanics and statistical mechanics of reinforced elastomeric blends. Lecture Notes in Applied and Computational Mechanics, Vol. 70, Springer, Berlin, 2013, 81-128. 

Buehler Ml, van Duin ACT, Goddard WA (2006) Multiparadigm modeling of dynamical crack propagation in silicon using a reactive force field. Phys Rev Lett 96(9) 095505-(4)... 

Atkinson, C., Popelar, C.H. (1979) Antiplane dynamic crack propagation in a viscoelastic layer. J. Mech. Phys. Solids 27, 431-439... 

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